已开启
CVE-2026-64567 #17101
openeuler-ci-bot创建于  8月11日
openeuler-ci-bot
openeuler-ci-bot成员
8月11日 创建

一、漏洞信息
漏洞编号:CVE-2026-64567
漏洞归属组件:kernel
漏洞归属的版本:4.19.140,4.19.194,4.19.90,5.10.0,6.1.19,6.12.33,6.18.18,6.4.0,6.6.0
CVSS评分:
BaseScore:7.8 High
Vector:CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
漏洞简述:
In the Linux kernel, the following vulnerability has been resolved:btrfs: reject free space cache with more entries than pagesWhen loading a v1 free space cache, __load_free_space_cache() takesnum_entries and num_bitmaps straight from the on-diskbtrfs_free_space_header. That header is stored in the tree_root under a keywith type 0, which the tree-checker has no case for, so neither count isvalidated before the load trusts it.The load loops num_entries times and maps the next page whenever the currentone runs out, going through io_ctl_check_crc() -> io_ctl_map_page(), whichdoes io_ctl->pages[io_ctl->index++]. But pages[] is allocated inio_ctl_init() from the cache inode s i_size, not from num_entries: num_pages = DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE); io_ctl->pages = kcalloc(num_pages, sizeof(struct page *), GFP_NOFS);So if num_entries claims more records than the pages can hold, io_ctl->indexruns off the end of pages[]. The write side never hits this becauseio_ctl_add_entry() and io_ctl_add_bitmap() both stop onceio_ctl->index >= io_ctl->num_pages; the read side just never had the samecheck.To trigger it, take a clean cache (num_entries = here), set num_entriesin the header to 0x10000, and fix up the leaf checksum so it still passesthe tree-checker. The cache inode has i_size = 65536, so num_pages is 16 andpages[] is a 16-pointer (kmalloc-128) array. The load now tries to read65536 entries, io_ctl->index walks up to 16, and pages[16] is read past thearray: BUG: KASAN: slab-out-of-bounds in io_ctl_check_crc (fs/btrfs/free-space-cache.c:420 fs/btrfs/free-space-cache.c:565) Read of size 8 at addr ffff88800c833a80 by task kworker/u8:3/58 io_ctl_check_crc (fs/btrfs/free-space-cache.c:420 fs/btrfs/free-space-cache.c:565) __load_free_space_cache (fs/btrfs/free-space-cache.c:655 fs/btrfs/free-space-cache.c:820) load_free_space_cache (fs/btrfs/free-space-cache.c:1017) caching_thread (fs/btrfs/block-group.c:880) btrfs_work_helper (fs/btrfs/async-thread.c:312) process_one_work worker_thread kthread ret_from_forkfree-space-cache.c:420 is io_ctl_map_page(), inlined into io_ctl_check_crc()at line 565, which is why that is the frame KASAN names. The out-of-boundsslot is then treated as a struct page and handed to crc32c(), so the badread turns into a GP fault.Add the missing check to io_ctl_check_crc(), which is where both the entryloop and the bitmap loop end up. When num_entries is too large the load nowfails like any corrupt cache: __load_free_space_cache() drops it and rebuildsthe free space from the extent tree, so a valid cache is never rejected.
漏洞公开时间:2026-08-05 16:16:36
漏洞创建时间:2026-08-11 14:50:03
漏洞详情参考链接:
https://nvd.nist.gov/vuln/detail/CVE-2026-64567

更多参考(点击展开)
参考来源 参考链接 来源链接
https://git.kernel.org/stable/c/f9fef131fa3f59b857217f522fa5ea430d1b707c
https://git.kernel.org/stable/c/404a0b986e0b6e79738fdf1f0ebbbc43b9acd2a2
https://nvd.nist.gov/vuln/detail/CVE-2026-64567
https://lore.kernel.org/linux-cve-announce/2026080558-CVE-2026-64567-a7b8@gregkh/T
https://bugzilla.redhat.com/show_bug.cgi?id=2511408
https://git.kernel.org/stable/c/c9c38066b6446e83668c041702bb639b0ca49363
https://lore.kernel.org/linux-cve-announce/2026080558-CVE-2026-64567-a7b8@gregkh/T/#u
https://git.kernel.org/stable/c/5e1b2ca6b34939e70fb0785e8222b53cf060016f
https://git.kernel.org/stable/c/33878ba25e2638bc0c61623d7a05c9ca2b74c039
https://security-tracker.debian.org/tracker/CVE-2026-64567
https://git.kernel.org/stable/c/8ded74c654a982dc8581a17b0caa7fcedb20de69
https://git.kernel.org/stable/c/a2d8d5647ed854e38f941741aea45b9eb15a6350
https://git.kernel.org/stable/c/094734c7aaa2b36751dc32480a680a4952685e78
https://www.cve.org/CVERecord?id=CVE-2026-64567

漏洞分析指导链接:
https://atomgit.com/openeuler/cve-manager/blob/master/cve-vulner-manager/doc/md/manual.md
漏洞数据来源:
七彩瞬析开源风险感知平台
漏洞补丁信息:

详情(点击展开)
影响的包 修复版本 修复补丁 问题引入补丁 来源
gregkh/linux https://git.kernel.org/stable/c/33878ba25e2638bc0c61623d7a05c9ca2b74c039 ljqc
gregkh/linux https://git.kernel.org/stable/c/404a0b986e0b6e79738fdf1f0ebbbc43b9acd2a2 ljqc
gregkh/linux https://git.kernel.org/stable/c/5e1b2ca6b34939e70fb0785e8222b53cf060016f ljqc
gregkh/linux https://git.kernel.org/stable/c/f9fef131fa3f59b857217f522fa5ea430d1b707c ljqc
gregkh/linux https://git.kernel.org/stable/c/a2d8d5647ed854e38f941741aea45b9eb15a6350 ljqc
https://git.kernel.org/stable/c/f9fef131fa3f59b857217f522fa5ea430d1b707c cvelistv5
https://git.kernel.org/stable/c/404a0b986e0b6e79738fdf1f0ebbbc43b9acd2a2 cvelistv5
https://git.kernel.org/stable/c/c9c38066b6446e83668c041702bb639b0ca49363 nvd
https://git.kernel.org/stable/c/5e1b2ca6b34939e70fb0785e8222b53cf060016f cvelistv5
https://git.kernel.org/stable/c/33878ba25e2638bc0c61623d7a05c9ca2b74c039 cvelistv5
https://git.kernel.org/stable/c/8ded74c654a982dc8581a17b0caa7fcedb20de69 nvd
https://git.kernel.org/stable/c/a2d8d5647ed854e38f941741aea45b9eb15a6350 cvelistv5
https://git.kernel.org/stable/c/094734c7aaa2b36751dc32480a680a4952685e78 nvd

二、漏洞分析结构反馈
影响性分析说明:
In the Linux kernel, the following vulnerability has been resolved:btrfs: reject free space cache with more entries than pagesWhen loading a v1 free space cache, __load_free_space_cache() takesnum_entries and num_bitmaps straight from the on-diskbtrfs_free_space_header. That header is stored in the tree_root under a keywith type 0, which the tree-checker has no case for, so neither count isvalidated before the load trusts it.The load loops num_entries times and maps the next page whenever the currentone runs out, going through io_ctl_check_crc() -> io_ctl_map_page(), whichdoes io_ctl->pages[io_ctl->index++]. But pages[] is allocated inio_ctl_init() from the cache inode s i_size, not from num_entries:num_pages = DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE);io_ctl->pages = kcalloc(num_pages, sizeof(struct page *), GFP_NOFS);So if num_entries claims more records than the pages can hold, io_ctl->indexruns off the end of pages[]. The write side never hits this becauseio_ctl_add_entry() and io_ctl_add_bitmap() both stop onceio_ctl->index >= io_ctl->num_pages; the read side just never had the samecheck.To trigger it, take a clean cache (num_entries = here), set num_entriesin the header to 0x10000, and fix up the leaf checksum so it still passesthe tree-checker. The cache inode has i_size = 65536, so num_pages is 16 andpages[] is a 16-pointer (kmalloc-128) array. The load now tries to read65536 entries, io_ctl->index walks up to 16, and pages[16] is read past thearray:BUG: KASAN: slab-out-of-bounds in io_ctl_check_crc (fs/btrfs/free-space-cache.c:420 fs/btrfs/free-space-cache.c:565)Read of size 8 at addr ffff88800c833a80 by task kworker/u8:3/58io_ctl_check_crc (fs/btrfs/free-space-cache.c:420 fs/btrfs/free-space-cache.c:565)__load_free_space_cache (fs/btrfs/free-space-cache.c:655 fs/btrfs/free-space-cache.c:820)load_free_space_cache (fs/btrfs/free-space-cache.c:1017)caching_thread (fs/btrfs/block-group.c:880)btrfs_work_helper (fs/btrfs/async-thread.c:312)process_one_workworker_threadkthreadret_from_forkfree-space-cache.c:420 is io_ctl_map_page(), inlined into io_ctl_check_crc()at line 565, which is why that is the frame KASAN names. The out-of-boundsslot is then treated as a struct page and handed to crc32c(), so the badread turns into a GP fault.Add the missing check to io_ctl_check_crc(), which is where both the entryloop and the bitmap loop end up. When num_entries is too large the load nowfails like any corrupt cache: __load_free_space_cache() drops it and rebuildsthe free space from the extent tree, so a valid cache is never rejected.
openEuler评分:
7.8
Vector:CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
受影响版本排查(受影响/不受影响):
1.master(6.18.40):不受影响
2.openEuler-20.03-LTS-SP4(4.19.90):受影响
3.openEuler-22.03-LTS-SP4(5.10.0):受影响
4.openEuler-24.03-LTS-Next(6.6.0):不受影响
5.openEuler-24.03-LTS-SP1(6.6.0):受影响
6.openEuler-24.03-LTS-SP3(6.6.0):受影响
7.openEuler-24.03-LTS-SP4(6.6.0):受影响
8.openEuler-22.03-LTS-SP3(5.10.0):受影响
9.openEuler-24.03-LTS(6.6.0):受影响
10.openEuler-24.03-LTS-SP2(6.6.0):受影响

修复是否涉及abi变化(是/否):
1.master(6.18.40):否
2.openEuler-20.03-LTS-SP4(4.19.90):否
3.openEuler-22.03-LTS-SP4(5.10.0):否
4.openEuler-24.03-LTS-Next(6.6.0):否
5.openEuler-24.03-LTS-SP1(6.6.0):否
6.openEuler-24.03-LTS-SP3(6.6.0):否
7.openEuler-24.03-LTS-SP4(6.6.0):否
8.openEuler-22.03-LTS-SP3(5.10.0):否
9.openEuler-24.03-LTS(6.6.0):否
10.openEuler-24.03-LTS-SP2(6.6.0):否

原因说明:
1.master(6.18.40):不受影响-漏洞代码不能被攻击者触发
2.openEuler-20.03-LTS-SP4(4.19.90):正常修复
3.openEuler-22.03-LTS-SP4(5.10.0):正常修复
4.openEuler-24.03-LTS-Next(6.6.0):不受影响-漏洞代码不能被攻击者触发
5.openEuler-24.03-LTS-SP1(6.6.0):正常修复
6.openEuler-24.03-LTS-SP3(6.6.0):正常修复
7.openEuler-24.03-LTS-SP4(6.6.0):正常修复
8.openEuler-22.03-LTS-SP3(5.10.0):不修复-超出修复范围
9.openEuler-24.03-LTS(6.6.0):不修复-超出修复范围
10.openEuler-24.03-LTS-SP2(6.6.0):不修复-超出修复范围

likedislike
openeuler-ci-botopeneuler-ci-bot成员
8月11日 添加了label:CVE/UNFIXED
openeuler-ci-bot
openeuler-ci-bot成员
8月11日 评论:

issue处理注意事项:
1. 提交正常修复分支的修复PR时,必须关联当前issue,否则无法关闭当前issue;
2. 模板内容需要填写完整, 无论是受影响或者不受影响都需要填写完整内容;
3. 以下为模板中需要填写完整的内容, 请复制到评论区回复;
注: 内容的关键词(影响性分析说明, openEuler评分, 受影响版本排查(受影响/不受影响), 修复是否涉及abi变化(是/否), 原因说明)不能省略,省略后cve-manager将无法正常解析填写内容.


影响性分析说明:

openEuler评分: (评分和向量)

受影响版本排查(受影响/不受影响):
1.master(6.18.18):
2.openEuler-20.03-LTS-SP4(4.19.90):
3.openEuler-22.03-LTS-SP4(5.10.0):
4.openEuler-24.03-LTS-Next(6.6.0):
5.openEuler-24.03-LTS-SP1(6.6.0):
6.openEuler-24.03-LTS-SP3(6.6.0):
7.openEuler-24.03-LTS-SP4(6.6.0):

修复是否涉及abi变化(是/否):
1.master(6.18.18):
2.openEuler-20.03-LTS-SP4(4.19.90):
3.openEuler-22.03-LTS-SP4(5.10.0):
4.openEuler-24.03-LTS-Next(6.6.0):
5.openEuler-24.03-LTS-SP1(6.6.0):
6.openEuler-24.03-LTS-SP3(6.6.0):
7.openEuler-24.03-LTS-SP4(6.6.0):

原因说明:
1.master(6.18.18):
2.openEuler-20.03-LTS-SP4(4.19.90):
3.openEuler-22.03-LTS-SP4(5.10.0):
4.openEuler-24.03-LTS-Next(6.6.0):
5.openEuler-24.03-LTS-SP1(6.6.0):
6.openEuler-24.03-LTS-SP3(6.6.0):
7.openEuler-24.03-LTS-SP4(6.6.0):


原因说明填写请参考下方表格(注意:版本是否受影响和版本的原因说明必须对应,例如master版本分支受影响,那原因说明只能是受影响对应的原因之一!):

分支状态
原因说明 使用场景
受影响 正常修复 受影响且需要修复(包含升级版本修复)的漏洞;
受影响且已经修复的漏洞(历史修复PR也需要关联issue);
若因特殊原因无法修复,应修改原因说明为【不修复-特殊原因】,并在安委会备案相关情况。
受影响 漏洞仍在分析中 已关注到相关漏洞,正在处理,未明确漏洞影响和修复方案。
受影响 暂不修复-暂无解决方案或补丁 当前没有可用的修复或补救措施。【影响性分析】中应包含有关为什么没有修复或补救措施的详细说明、上游相关PR等。
受影响 不修复-超出修复范围 没有漏洞的修复计划。当版本停维、软件包宣布生命周期终止或弃用使用。
受影响 不修复-特殊原因导致不再修复 如存在其他特殊情况不修复相关漏洞,或评估后无法升级修复,应在openEuler社区安全委员会例会进行说明备案。
【影响性分析】中应包含不发布修复的详细说明、特殊情况还应有安委会会议纪要。
不受影响 不受影响-组件不存在 软件不受影响,因为易受攻击的组件不在产品中。
不受影响 不受影响-已有内置的内联控制或缓解措施 内置的内联控制或缓解措施可防止攻击者利用漏洞
不受影响 不受影响-漏洞代码不能被攻击者触发 易受攻击的组件存在,并且该组件包含易受攻击的代码。但是,易受攻击的代码的使用方式使得攻击者无法进行任何预期的攻击。
不受影响 不受影响-漏洞代码不在执行路径 易受影响的代码在执行过程中不可访问,包括产品的非预期状态。产品不使用也不执行的组件。
不受影响 不受影响-漏洞代码不存在 产品不受影响,因为漏洞背后的代码在产品中不存在。与component_not_present不同的是,有问题的组件存在,但由于某种原因(例如安全的编译器选项)使漏洞的特定代码不存在于组件中。

issue处理具体操作请参考:
https://atomgit.com/openeuler/cve-manager/blob/master/cve-vulner-manager/doc/md/manual.md
pr关联issue具体操作请参考:
https://docs.atomgit.com/docs/help/home/org_project/pullrequests/pr-related-issue

likedislike
devstation-robot
devstation-robot
8月11日 评论:

检测到新建 CVE Issue,CVE-ID: CVE-2026-64567。

你可以通过以下两种方式使用 CVE 修复服务:

  1. 分支影响分析

    • 在本 Issue 下评论:/analysis_branches
    • 系统将自动分析各个分支是否受影响,并在本 Issue 下给出表格形式的分析结果;
  2. 在指定分支上创建 PR(修复提交)

    • 在本 Issue 下按如下格式评论(字段均为必填,每个字段单独一行):
/create_pr

branch: OLK-6.6 OLK-5.10
name: dev
email: dev@devstation.com
backport-engine: mystique
  • 说明:
    • branch: 需要创建 PR 的目标分支列表,例如 OLK-6.6 OLK-5.10;
    • name: PR 签名人姓名(如责任人或安全负责人);
    • email: PR 签名人邮箱;
    • backport-engine(可选): 回移植引擎,可设为 mystique 切换迁移方案,不填则使用默认引擎;

系统会根据上述信息自动在指定分支上创建 PR,并在本 Issue 下反馈结果。

provided by DevStation.

likedislike
openeuler-ci-bot
openeuler-ci-bot成员
8月11日 评论:
参考网址 关联pr 状态 补丁链接
https://www.opencve.io/cve/CVE-2026-64567NoneNonehttps://git.kernel.org/stable/c/33878ba25e2638bc0c61623d7a05c9ca2b74c039
https://git.kernel.org/stable/c/5e1b2ca6b34939e70fb0785e8222b53cf060016f
https://git.kernel.org/stable/c/f9fef131fa3f59b857217f522fa5ea430d1b707c
https://git.kernel.org/stable/c/a2d8d5647ed854e38f941741aea45b9eb15a6350
https://git.kernel.org/stable/c/404a0b986e0b6e79738fdf1f0ebbbc43b9acd2a2
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2026-64567
https://security-tracker.debian.org/tracker/CVE-2026-64567NoneNonehttps://git.kernel.org/linus/a2d8d5647ed854e38f941741aea45b9eb15a6350
http://www.cnnvd.org.cn/web/vulnerability/queryLds.tag?qcvCnnvdid=CVE-2026-64567
https://nvd.nist.gov/vuln/detail/CVE-2026-64567NoneNonehttps://git.kernel.org/stable/c/33878ba25e2638bc0c61623d7a05c9ca2b74c039
https://git.kernel.org/stable/c/5e1b2ca6b34939e70fb0785e8222b53cf060016f
https://git.kernel.org/stable/c/f9fef131fa3f59b857217f522fa5ea430d1b707c
https://git.kernel.org/stable/c/a2d8d5647ed854e38f941741aea45b9eb15a6350
https://git.kernel.org/stable/c/404a0b986e0b6e79738fdf1f0ebbbc43b9acd2a2
https://ubuntu.com/security/CVE-2026-64567NoneNonehttps://git.kernel.org/linus/5b0e95bf607ddd59b39f52d3d55e6581c817b530
https://git.kernel.org/stable/c/33878ba25e2638bc0c61623d7a05c9ca2b74c039
https://git.kernel.org/stable/c/404a0b986e0b6e79738fdf1f0ebbbc43b9acd2a2
https://git.kernel.org/stable/c/5e1b2ca6b34939e70fb0785e8222b53cf060016f
https://git.kernel.org/stable/c/f9fef131fa3f59b857217f522fa5ea430d1b707c
https://git.kernel.org/stable/c/a2d8d5647ed854e38f941741aea45b9eb15a6350
https://git.kernel.org/linus/a2d8d5647ed854e38f941741aea45b9eb15a6350
https://discourse.ubuntu.com/c/project

说明:补丁链接仅供初步排查参考,实际可用性请人工再次确认,补丁下载验证可使用CVE补丁工具。
若补丁不准确,烦请在此issue下评论 '/report-patch 参考网址 补丁链接1,补丁链接2' 反馈正确信息,便于我们不断优化工具,不胜感激。
如 /report-patch https://security-tracker.debian.org/tracker/CVE-2021-3997 https://github.com/systemd/systemd/commit/5b1cf7a9be37e20133c0208005274ce4a5b5c6a1

likedislike
openeuler-ci-botopeneuler-ci-bot成员
8月11日 添加了label:sig/Kernel
openeuler-ci-bot
openeuler-ci-bot成员
8月11日 评论:

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If you have any questions, please contact the SIG: Kernel ,
and any of the maintainers: @hanjunguo, @oekernel, @sanglipeng, @wkfxxx, @zeng_zhaorong ,
and any of the committers: @CTC-XiboWang, @Frank_Sae, @GoGo_phytium, @GongLei-, @LiuYongQiang0816, @SuperSix173, @Tankll2021, @TrueAI, @allen-shi, @baratta, @bibo_mao, @caixu-blue, @chen-jun-hw, @chenjiesong, @chenjunxin1992, @chenke2026, @chiqijun, @chriszjh, @duanqiangwen, @eingesch, @fangfeng123, @fanghaiqinghw, @gaojuxin09, @gouhao2022, @guohaocs2c, @guzitao, @hanjunguo, @hanliyang, @hellotcc, @henryze, @hewanhan, @hjx_gitff, @hongbo-lee, @hongwu-wang, @htforge, @hu-chunzhi, @hunan4222, @jackknight, @jerry_lilijun, @jiayi0118, @junlong-zheng, @juntianlinux, @kailiu42, @kaitiandu, @kazero00, @kevinzhu1, @kile2009, @klmengkd, @koishimind, @kongzizaixian, @kylin-mayukun, @leoliu-oc, @li-huisong, @linan888, @linyunsheng, @liulongfang, @liyihang0226, @lostway1, @lujialin2, @mao-hongbo, @markyuan4ta21, @mawupeng, @mingqian218472, @mingrui-liu, @mufengyan, @pigalsofine, @robinorg, @rock_hw, @sanglipeng, @shu-shengming, @shuaijiakun, @sming56_admin, @stavewu, @stkid, @sun_nanyong, @wangboe2022, @wanghang73, @wenzhiwei11, @whoisxxx, @wkfxxx, @woqidaideshi, @wsoydl, @xingmz1, @xukuohai, @yeweihua999, @ygn-ndwd-official, @yonghu_4dc5, @young-sun, @yubo-liu1, @yuehaibing_planb, @yuzenghui1, @zhang-changzhong, @zhangyi089, @zhujianwei001, @zichengqu, @zouyipeng, @zqiao216 .

likedislike
hulk-ci-bot成员
8月11日 评论:

CVE-2026-64567

影响性分析说明:
In the Linux kernel, the following vulnerability has been resolved:

btrfs: reject free space cache with more entries than pages

When loading a v1 free space cache, __load_free_space_cache() takes
num_entries and num_bitmaps straight from the on-disk
btrfs_free_space_header. That header is stored in the tree_root under a key
with type 0, which the tree-checker has no case for, so neither count is
validated before the load trusts it.

The load loops num_entries times and maps the next page whenever the current
one runs out, going through io_ctl_check_crc() -> io_ctl_map_page(), which
does io_ctl->pages[io_ctl->index++]. But pages[] is allocated in
io_ctl_init() from the cache inode's i_size, not from num_entries:

num_pages = DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE);
io_ctl->pages = kcalloc(num_pages, sizeof(struct page *), GFP_NOFS);

So if num_entries claims more records than the pages can hold, io_ctl->index
runs off the end of pages[]. The write side never hits this because
io_ctl_add_entry() and io_ctl_add_bitmap() both stop once
io_ctl->index >= io_ctl->num_pages; the read side just never had the same
check.

To trigger it, take a clean cache (num_entries = here), set num_entries
in the header to 0x10000, and fix up the leaf checksum so it still passes
the tree-checker. The cache inode has i_size = 65536, so num_pages is 16 and
pages[] is a 16-pointer (kmalloc-128) array. The load now tries to read
65536 entries, io_ctl->index walks up to 16, and pages[16] is read past the
array:

BUG: KASAN: slab-out-of-bounds in io_ctl_check_crc (fs/btrfs/free-space-cache.c:420 fs/btrfs/free-space-cache.c:565)
Read of size 8 at addr ffff88800c833a80 by task kworker/u8:3/58
io_ctl_check_crc (fs/btrfs/free-space-cache.c:420 fs/btrfs/free-space-cache.c:565)
__load_free_space_cache (fs/btrfs/free-space-cache.c:655 fs/btrfs/free-space-cache.c:820)
load_free_space_cache (fs/btrfs/free-space-cache.c:1017)
caching_thread (fs/btrfs/block-group.c:880)
btrfs_work_helper (fs/btrfs/async-thread.c:312)
process_one_work
worker_thread
kthread
ret_from_fork

free-space-cache.c:420 is io_ctl_map_page(), inlined into io_ctl_check_crc()
at line 565, which is why that is the frame KASAN names. The out-of-bounds
slot is then treated as a struct page and handed to crc32c(), so the bad
read turns into a GP fault.

Add the missing check to io_ctl_check_crc(), which is where both the entry
loop and the bitmap loop end up. When num_entries is too large the load now
fails like any corrupt cache: __load_free_space_cache() drops it and rebuilds
the free space from the extent tree, so a valid cache is never rejected.

openEuler评分:(评分和向量)
7.8
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

受影响版本排查(受影响/不受影响):
1.master:不受影响
2.openEuler-20.03-LTS-SP4:受影响
3.openEuler-22.03-LTS-SP3:受影响
4.openEuler-22.03-LTS-SP4:受影响
5.openEuler-24.03-LTS:受影响
6.openEuler-24.03-LTS-Next:不受影响
7.openEuler-24.03-LTS-SP1:受影响
8.openEuler-24.03-LTS-SP2:受影响
9.openEuler-24.03-LTS-SP3:受影响
10.openEuler-24.03-LTS-SP4:受影响

修复是否涉及abi变化(是/否):
1.master:否
2.openEuler-20.03-LTS-SP4:否
3.openEuler-22.03-LTS-SP3:否
4.openEuler-22.03-LTS-SP4:否
5.openEuler-24.03-LTS:否
6.openEuler-24.03-LTS-Next:否
7.openEuler-24.03-LTS-SP1:否
8.openEuler-24.03-LTS-SP2:否
9.openEuler-24.03-LTS-SP3:否
10.openEuler-24.03-LTS-SP4:否

原因说明:
1.master:不受影响-漏洞代码不能被攻击者触发
2.openEuler-20.03-LTS-SP4:暂不修复-漏洞仍在分析中
3.openEuler-22.03-LTS-SP3:不修复-超出修复范围
4.openEuler-22.03-LTS-SP4:暂不修复-漏洞仍在分析中
5.openEuler-24.03-LTS:不修复-超出修复范围
6.openEuler-24.03-LTS-Next:不受影响-漏洞代码不能被攻击者触发
7.openEuler-24.03-LTS-SP1:暂不修复-漏洞仍在分析中
8.openEuler-24.03-LTS-SP2:不修复-超出修复范围
9.openEuler-24.03-LTS-SP3:暂不修复-漏洞仍在分析中
10.openEuler-24.03-LTS-SP4:暂不修复-漏洞仍在分析中

likedislike
openeuler-ci-botopeneuler-ci-bot成员
8月11日 修改了issue 的描述
openeuler-ci-bot
openeuler-ci-bot成员
8月11日 评论:

@young-sun 经过 cve-manager 解析, 已分析的内容如下表所示:

状态 分析项目 内容
已分析 1.影响性分析说明 In the Linux kernel, the following vulnerability has been resolved:btrfs: reject free space cache with more entries than pagesWhen loading a v1 free space cache, __load_free_space_cache() takesnum_entries and num_bitmaps straight from the on-diskbtrfs_free_space_header. That header is stored in the tree_root under a keywith type 0, which the tree-checker has no case for, so neither count isvalidated before the load trusts it.The load loops num_entries times and maps the next page whenever the currentone runs out, going through io_ctl_check_crc() -> io_ctl_map_page(), whichdoes io_ctl->pages[io_ctl->index++]. But pages[] is allocated inio_ctl_init() from the cache inode's i_size, not from num_entries:num_pages = DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE);io_ctl->pages = kcalloc(num_pages, sizeof(struct page *), GFP_NOFS);So if num_entries claims more records than the pages can hold, io_ctl->indexruns off the end of pages[]. The write side never hits this becauseio_ctl_add_entry() and io_ctl_add_bitmap() both stop onceio_ctl->index >= io_ctl->num_pages; the read side just never had the samecheck.To trigger it, take a clean cache (num_entries = here), set num_entriesin the header to 0x10000, and fix up the leaf checksum so it still passesthe tree-checker. The cache inode has i_size = 65536, so num_pages is 16 andpages[] is a 16-pointer (kmalloc-128) array. The load now tries to read65536 entries, io_ctl->index walks up to 16, and pages[16] is read past thearray: BUG: KASAN: slab-out-of-bounds in io_ctl_check_crc (fs/btrfs/free-space-cache.c:420 fs/btrfs/free-space-cache.c:565) Read of size 8 at addr ffff88800c833a80 by task kworker/u8:3/58 io_ctl_check_crc (fs/btrfs/free-space-cache.c:420 fs/btrfs/free-space-cache.c:565) __load_free_space_cache (fs/btrfs/free-space-cache.c:655 fs/btrfs/free-space-cache.c:820) load_free_space_cache (fs/btrfs/free-space-cache.c:1017) caching_thread (fs/btrfs/block-group.c:880) btrfs_work_helper (fs/btrfs/async-thread.c:312) process_one_work worker_thread kthread ret_from_forkfree-space-cache.c:420 is io_ctl_map_page(), inlined into io_ctl_check_crc()at line 565, which is why that is the frame KASAN names. The out-of-boundsslot is then treated as a struct page and handed to crc32c(), so the badread turns into a GP fault.Add the missing check to io_ctl_check_crc(), which is where both the entryloop and the bitmap loop end up. When num_entries is too large the load nowfails like any corrupt cache: __load_free_space_cache() drops it and rebuildsthe free space from the extent tree, so a valid cache is never rejected.
已分析 2.openEulerScore 7.8
已分析 3.openEulerVector AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
已分析 4.受影响版本排查 master:不受影响,openEuler-20.03-LTS-SP4:受影响,openEuler-22.03-LTS-SP4:受影响,openEuler-24.03-LTS-Next:不受影响,openEuler-24.03-LTS-SP1:受影响,openEuler-24.03-LTS-SP3:受影响,openEuler-24.03-LTS-SP4:受影响,openEuler-22.03-LTS-SP3:受影响,openEuler-24.03-LTS:受影响,openEuler-24.03-LTS-SP2:受影响
已分析 5.是否涉及abi变化 master:否,openEuler-20.03-LTS-SP4:否,openEuler-22.03-LTS-SP4:否,openEuler-24.03-LTS-Next:否,openEuler-24.03-LTS-SP1:否,openEuler-24.03-LTS-SP3:否,openEuler-24.03-LTS-SP4:否,openEuler-22.03-LTS-SP3:否,openEuler-24.03-LTS:否,openEuler-24.03-LTS-SP2:否
已分析 6.原因说明 master:不受影响-漏洞代码不能被攻击者触发,openEuler-20.03-LTS-SP4:漏洞仍在分析中,openEuler-22.03-LTS-SP4:漏洞仍在分析中,openEuler-24.03-LTS-Next:不受影响-漏洞代码不能被攻击者触发,openEuler-24.03-LTS-SP1:漏洞仍在分析中,openEuler-24.03-LTS-SP3:漏洞仍在分析中,openEuler-24.03-LTS-SP4:漏洞仍在分析中,openEuler-22.03-LTS-SP3:不修复-超出修复范围,openEuler-24.03-LTS:不修复-超出修复范围,openEuler-24.03-LTS-SP2:不修复-超出修复范围

请确认分析内容的准确性, 确认无误后, 您可以进行后续步骤, 否则您可以继续分析.

likedislike
openeuler-ci-botopeneuler-ci-bot成员
8月11日 issue状态由 待办的 改变为 进行中
此处折叠了8条事件消息 查看更多
openeuler-ci-botopeneuler-ci-bot成员
8月22日 修改了issue 的描述
hulk-ci-bot成员
8月24日 评论:

CVE-2026-64567

影响性分析说明:
In the Linux kernel, the following vulnerability has been resolved:

btrfs: reject free space cache with more entries than pages

When loading a v1 free space cache, __load_free_space_cache() takes
num_entries and num_bitmaps straight from the on-disk
btrfs_free_space_header. That header is stored in the tree_root under a key
with type 0, which the tree-checker has no case for, so neither count is
validated before the load trusts it.

The load loops num_entries times and maps the next page whenever the current
one runs out, going through io_ctl_check_crc() -> io_ctl_map_page(), which
does io_ctl->pages[io_ctl->index++]. But pages[] is allocated in
io_ctl_init() from the cache inode's i_size, not from num_entries:

num_pages = DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE);
io_ctl->pages = kcalloc(num_pages, sizeof(struct page *), GFP_NOFS);

So if num_entries claims more records than the pages can hold, io_ctl->index
runs off the end of pages[]. The write side never hits this because
io_ctl_add_entry() and io_ctl_add_bitmap() both stop once
io_ctl->index >= io_ctl->num_pages; the read side just never had the same
check.

To trigger it, take a clean cache (num_entries = here), set num_entries
in the header to 0x10000, and fix up the leaf checksum so it still passes
the tree-checker. The cache inode has i_size = 65536, so num_pages is 16 and
pages[] is a 16-pointer (kmalloc-128) array. The load now tries to read
65536 entries, io_ctl->index walks up to 16, and pages[16] is read past the
array:

BUG: KASAN: slab-out-of-bounds in io_ctl_check_crc (fs/btrfs/free-space-cache.c:420 fs/btrfs/free-space-cache.c:565)
Read of size 8 at addr ffff88800c833a80 by task kworker/u8:3/58
io_ctl_check_crc (fs/btrfs/free-space-cache.c:420 fs/btrfs/free-space-cache.c:565)
__load_free_space_cache (fs/btrfs/free-space-cache.c:655 fs/btrfs/free-space-cache.c:820)
load_free_space_cache (fs/btrfs/free-space-cache.c:1017)
caching_thread (fs/btrfs/block-group.c:880)
btrfs_work_helper (fs/btrfs/async-thread.c:312)
process_one_work
worker_thread
kthread
ret_from_fork

free-space-cache.c:420 is io_ctl_map_page(), inlined into io_ctl_check_crc()
at line 565, which is why that is the frame KASAN names. The out-of-bounds
slot is then treated as a struct page and handed to crc32c(), so the bad
read turns into a GP fault.

Add the missing check to io_ctl_check_crc(), which is where both the entry
loop and the bitmap loop end up. When num_entries is too large the load now
fails like any corrupt cache: __load_free_space_cache() drops it and rebuilds
the free space from the extent tree, so a valid cache is never rejected.

openEuler评分:(评分和向量)
7.8
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

受影响版本排查(受影响/不受影响):
1.master:不受影响
2.openEuler-20.03-LTS-SP4:受影响
3.openEuler-22.03-LTS-SP3:受影响
4.openEuler-22.03-LTS-SP4:受影响
5.openEuler-24.03-LTS:受影响
6.openEuler-24.03-LTS-Next:不受影响
7.openEuler-24.03-LTS-SP1:受影响
8.openEuler-24.03-LTS-SP2:受影响
9.openEuler-24.03-LTS-SP3:受影响
10.openEuler-24.03-LTS-SP4:受影响

修复是否涉及abi变化(是/否):
1.master:否
2.openEuler-20.03-LTS-SP4:否
3.openEuler-22.03-LTS-SP3:否
4.openEuler-22.03-LTS-SP4:否
5.openEuler-24.03-LTS:否
6.openEuler-24.03-LTS-Next:否
7.openEuler-24.03-LTS-SP1:否
8.openEuler-24.03-LTS-SP2:否
9.openEuler-24.03-LTS-SP3:否
10.openEuler-24.03-LTS-SP4:否

原因说明:
1.master:不受影响-漏洞代码不能被攻击者触发
2.openEuler-20.03-LTS-SP4:暂不修复-漏洞仍在分析中
3.openEuler-22.03-LTS-SP3:不修复-超出修复范围
4.openEuler-22.03-LTS-SP4:不修复-超出修复范围
5.openEuler-24.03-LTS:不修复-超出修复范围
6.openEuler-24.03-LTS-Next:不受影响-漏洞代码不能被攻击者触发
7.openEuler-24.03-LTS-SP1:暂不修复-漏洞仍在分析中
8.openEuler-24.03-LTS-SP2:不修复-超出修复范围
9.openEuler-24.03-LTS-SP3:暂不修复-漏洞仍在分析中
10.openEuler-24.03-LTS-SP4:暂不修复-漏洞仍在分析中

likedislike
openeuler-ci-botopeneuler-ci-bot成员
8月24日 修改了issue 的描述
openeuler-ci-bot
openeuler-ci-bot成员
8月24日 评论:

@young-sun 经过 cve-manager 解析, 已分析的内容如下表所示:

状态 分析项目 内容
已分析 1.影响性分析说明 In the Linux kernel, the following vulnerability has been resolved:btrfs: reject free space cache with more entries than pagesWhen loading a v1 free space cache, __load_free_space_cache() takesnum_entries and num_bitmaps straight from the on-diskbtrfs_free_space_header. That header is stored in the tree_root under a keywith type 0, which the tree-checker has no case for, so neither count isvalidated before the load trusts it.The load loops num_entries times and maps the next page whenever the currentone runs out, going through io_ctl_check_crc() -> io_ctl_map_page(), whichdoes io_ctl->pages[io_ctl->index++]. But pages[] is allocated inio_ctl_init() from the cache inode's i_size, not from num_entries:num_pages = DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE);io_ctl->pages = kcalloc(num_pages, sizeof(struct page *), GFP_NOFS);So if num_entries claims more records than the pages can hold, io_ctl->indexruns off the end of pages[]. The write side never hits this becauseio_ctl_add_entry() and io_ctl_add_bitmap() both stop onceio_ctl->index >= io_ctl->num_pages; the read side just never had the samecheck.To trigger it, take a clean cache (num_entries = here), set num_entriesin the header to 0x10000, and fix up the leaf checksum so it still passesthe tree-checker. The cache inode has i_size = 65536, so num_pages is 16 andpages[] is a 16-pointer (kmalloc-128) array. The load now tries to read65536 entries, io_ctl->index walks up to 16, and pages[16] is read past thearray: BUG: KASAN: slab-out-of-bounds in io_ctl_check_crc (fs/btrfs/free-space-cache.c:420 fs/btrfs/free-space-cache.c:565) Read of size 8 at addr ffff88800c833a80 by task kworker/u8:3/58 io_ctl_check_crc (fs/btrfs/free-space-cache.c:420 fs/btrfs/free-space-cache.c:565) __load_free_space_cache (fs/btrfs/free-space-cache.c:655 fs/btrfs/free-space-cache.c:820) load_free_space_cache (fs/btrfs/free-space-cache.c:1017) caching_thread (fs/btrfs/block-group.c:880) btrfs_work_helper (fs/btrfs/async-thread.c:312) process_one_work worker_thread kthread ret_from_forkfree-space-cache.c:420 is io_ctl_map_page(), inlined into io_ctl_check_crc()at line 565, which is why that is the frame KASAN names. The out-of-boundsslot is then treated as a struct page and handed to crc32c(), so the badread turns into a GP fault.Add the missing check to io_ctl_check_crc(), which is where both the entryloop and the bitmap loop end up. When num_entries is too large the load nowfails like any corrupt cache: __load_free_space_cache() drops it and rebuildsthe free space from the extent tree, so a valid cache is never rejected.
已分析 2.openEulerScore 7.8
已分析 3.openEulerVector AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
已分析 4.受影响版本排查 master:不受影响,openEuler-20.03-LTS-SP4:受影响,openEuler-22.03-LTS-SP4:受影响,openEuler-24.03-LTS-Next:不受影响,openEuler-24.03-LTS-SP1:受影响,openEuler-24.03-LTS-SP3:受影响,openEuler-24.03-LTS-SP4:受影响,openEuler-22.03-LTS-SP3:受影响,openEuler-24.03-LTS:受影响,openEuler-24.03-LTS-SP2:受影响
已分析 5.是否涉及abi变化 master:否,openEuler-20.03-LTS-SP4:否,openEuler-22.03-LTS-SP4:否,openEuler-24.03-LTS-Next:否,openEuler-24.03-LTS-SP1:否,openEuler-24.03-LTS-SP3:否,openEuler-24.03-LTS-SP4:否,openEuler-22.03-LTS-SP3:否,openEuler-24.03-LTS:否,openEuler-24.03-LTS-SP2:否
已分析 6.原因说明 master:不受影响-漏洞代码不能被攻击者触发,openEuler-20.03-LTS-SP4:漏洞仍在分析中,openEuler-22.03-LTS-SP4:不修复-超出修复范围,openEuler-24.03-LTS-Next:不受影响-漏洞代码不能被攻击者触发,openEuler-24.03-LTS-SP1:漏洞仍在分析中,openEuler-24.03-LTS-SP3:漏洞仍在分析中,openEuler-24.03-LTS-SP4:漏洞仍在分析中,openEuler-22.03-LTS-SP3:不修复-超出修复范围,openEuler-24.03-LTS:不修复-超出修复范围,openEuler-24.03-LTS-SP2:不修复-超出修复范围

请确认分析内容的准确性, 确认无误后, 您可以进行后续步骤, 否则您可以继续分析.

likedislike
hulk-ci-bot成员
8月24日 评论:

CVE-2026-64567

影响性分析说明:
In the Linux kernel, the following vulnerability has been resolved:

btrfs: reject free space cache with more entries than pages

When loading a v1 free space cache, __load_free_space_cache() takes
num_entries and num_bitmaps straight from the on-disk
btrfs_free_space_header. That header is stored in the tree_root under a key
with type 0, which the tree-checker has no case for, so neither count is
validated before the load trusts it.

The load loops num_entries times and maps the next page whenever the current
one runs out, going through io_ctl_check_crc() -> io_ctl_map_page(), which
does io_ctl->pages[io_ctl->index++]. But pages[] is allocated in
io_ctl_init() from the cache inode's i_size, not from num_entries:

num_pages = DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE);
io_ctl->pages = kcalloc(num_pages, sizeof(struct page *), GFP_NOFS);

So if num_entries claims more records than the pages can hold, io_ctl->index
runs off the end of pages[]. The write side never hits this because
io_ctl_add_entry() and io_ctl_add_bitmap() both stop once
io_ctl->index >= io_ctl->num_pages; the read side just never had the same
check.

To trigger it, take a clean cache (num_entries = here), set num_entries
in the header to 0x10000, and fix up the leaf checksum so it still passes
the tree-checker. The cache inode has i_size = 65536, so num_pages is 16 and
pages[] is a 16-pointer (kmalloc-128) array. The load now tries to read
65536 entries, io_ctl->index walks up to 16, and pages[16] is read past the
array:

BUG: KASAN: slab-out-of-bounds in io_ctl_check_crc (fs/btrfs/free-space-cache.c:420 fs/btrfs/free-space-cache.c:565)
Read of size 8 at addr ffff88800c833a80 by task kworker/u8:3/58
io_ctl_check_crc (fs/btrfs/free-space-cache.c:420 fs/btrfs/free-space-cache.c:565)
__load_free_space_cache (fs/btrfs/free-space-cache.c:655 fs/btrfs/free-space-cache.c:820)
load_free_space_cache (fs/btrfs/free-space-cache.c:1017)
caching_thread (fs/btrfs/block-group.c:880)
btrfs_work_helper (fs/btrfs/async-thread.c:312)
process_one_work
worker_thread
kthread
ret_from_fork

free-space-cache.c:420 is io_ctl_map_page(), inlined into io_ctl_check_crc()
at line 565, which is why that is the frame KASAN names. The out-of-bounds
slot is then treated as a struct page and handed to crc32c(), so the bad
read turns into a GP fault.

Add the missing check to io_ctl_check_crc(), which is where both the entry
loop and the bitmap loop end up. When num_entries is too large the load now
fails like any corrupt cache: __load_free_space_cache() drops it and rebuilds
the free space from the extent tree, so a valid cache is never rejected.

openEuler评分:(评分和向量)
7.8
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

受影响版本排查(受影响/不受影响):
1.master:不受影响
2.openEuler-20.03-LTS-SP4:受影响
3.openEuler-22.03-LTS-SP3:受影响
4.openEuler-22.03-LTS-SP4:受影响
5.openEuler-24.03-LTS:受影响
6.openEuler-24.03-LTS-Next:不受影响
7.openEuler-24.03-LTS-SP1:受影响
8.openEuler-24.03-LTS-SP2:受影响
9.openEuler-24.03-LTS-SP3:受影响
10.openEuler-24.03-LTS-SP4:受影响

修复是否涉及abi变化(是/否):
1.master:否
2.openEuler-20.03-LTS-SP4:否
3.openEuler-22.03-LTS-SP3:否
4.openEuler-22.03-LTS-SP4:否
5.openEuler-24.03-LTS:否
6.openEuler-24.03-LTS-Next:否
7.openEuler-24.03-LTS-SP1:否
8.openEuler-24.03-LTS-SP2:否
9.openEuler-24.03-LTS-SP3:否
10.openEuler-24.03-LTS-SP4:否

原因说明:
1.master:不受影响-漏洞代码不能被攻击者触发
2.openEuler-20.03-LTS-SP4:不修复-超出修复范围
3.openEuler-22.03-LTS-SP3:不修复-超出修复范围
4.openEuler-22.03-LTS-SP4:不修复-超出修复范围
5.openEuler-24.03-LTS:不修复-超出修复范围
6.openEuler-24.03-LTS-Next:不受影响-漏洞代码不能被攻击者触发
7.openEuler-24.03-LTS-SP1:暂不修复-漏洞仍在分析中
8.openEuler-24.03-LTS-SP2:不修复-超出修复范围
9.openEuler-24.03-LTS-SP3:暂不修复-漏洞仍在分析中
10.openEuler-24.03-LTS-SP4:暂不修复-漏洞仍在分析中

likedislike
openeuler-ci-botopeneuler-ci-bot成员
8月24日 修改了issue 的描述
openeuler-ci-bot
openeuler-ci-bot成员
8月24日 评论:

@young-sun 经过 cve-manager 解析, 已分析的内容如下表所示:

状态 分析项目 内容
已分析 1.影响性分析说明 In the Linux kernel, the following vulnerability has been resolved:btrfs: reject free space cache with more entries than pagesWhen loading a v1 free space cache, __load_free_space_cache() takesnum_entries and num_bitmaps straight from the on-diskbtrfs_free_space_header. That header is stored in the tree_root under a keywith type 0, which the tree-checker has no case for, so neither count isvalidated before the load trusts it.The load loops num_entries times and maps the next page whenever the currentone runs out, going through io_ctl_check_crc() -> io_ctl_map_page(), whichdoes io_ctl->pages[io_ctl->index++]. But pages[] is allocated inio_ctl_init() from the cache inode's i_size, not from num_entries:num_pages = DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE);io_ctl->pages = kcalloc(num_pages, sizeof(struct page *), GFP_NOFS);So if num_entries claims more records than the pages can hold, io_ctl->indexruns off the end of pages[]. The write side never hits this becauseio_ctl_add_entry() and io_ctl_add_bitmap() both stop onceio_ctl->index >= io_ctl->num_pages; the read side just never had the samecheck.To trigger it, take a clean cache (num_entries = here), set num_entriesin the header to 0x10000, and fix up the leaf checksum so it still passesthe tree-checker. The cache inode has i_size = 65536, so num_pages is 16 andpages[] is a 16-pointer (kmalloc-128) array. The load now tries to read65536 entries, io_ctl->index walks up to 16, and pages[16] is read past thearray: BUG: KASAN: slab-out-of-bounds in io_ctl_check_crc (fs/btrfs/free-space-cache.c:420 fs/btrfs/free-space-cache.c:565) Read of size 8 at addr ffff88800c833a80 by task kworker/u8:3/58 io_ctl_check_crc (fs/btrfs/free-space-cache.c:420 fs/btrfs/free-space-cache.c:565) __load_free_space_cache (fs/btrfs/free-space-cache.c:655 fs/btrfs/free-space-cache.c:820) load_free_space_cache (fs/btrfs/free-space-cache.c:1017) caching_thread (fs/btrfs/block-group.c:880) btrfs_work_helper (fs/btrfs/async-thread.c:312) process_one_work worker_thread kthread ret_from_forkfree-space-cache.c:420 is io_ctl_map_page(), inlined into io_ctl_check_crc()at line 565, which is why that is the frame KASAN names. The out-of-boundsslot is then treated as a struct page and handed to crc32c(), so the badread turns into a GP fault.Add the missing check to io_ctl_check_crc(), which is where both the entryloop and the bitmap loop end up. When num_entries is too large the load nowfails like any corrupt cache: __load_free_space_cache() drops it and rebuildsthe free space from the extent tree, so a valid cache is never rejected.
已分析 2.openEulerScore 7.8
已分析 3.openEulerVector AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
已分析 4.受影响版本排查 master:不受影响,openEuler-20.03-LTS-SP4:受影响,openEuler-22.03-LTS-SP4:受影响,openEuler-24.03-LTS-Next:不受影响,openEuler-24.03-LTS-SP1:受影响,openEuler-24.03-LTS-SP3:受影响,openEuler-24.03-LTS-SP4:受影响,openEuler-22.03-LTS-SP3:受影响,openEuler-24.03-LTS:受影响,openEuler-24.03-LTS-SP2:受影响
已分析 5.是否涉及abi变化 master:否,openEuler-20.03-LTS-SP4:否,openEuler-22.03-LTS-SP4:否,openEuler-24.03-LTS-Next:否,openEuler-24.03-LTS-SP1:否,openEuler-24.03-LTS-SP3:否,openEuler-24.03-LTS-SP4:否,openEuler-22.03-LTS-SP3:否,openEuler-24.03-LTS:否,openEuler-24.03-LTS-SP2:否
已分析 6.原因说明 master:不受影响-漏洞代码不能被攻击者触发,openEuler-20.03-LTS-SP4:不修复-超出修复范围,openEuler-22.03-LTS-SP4:不修复-超出修复范围,openEuler-24.03-LTS-Next:不受影响-漏洞代码不能被攻击者触发,openEuler-24.03-LTS-SP1:漏洞仍在分析中,openEuler-24.03-LTS-SP3:漏洞仍在分析中,openEuler-24.03-LTS-SP4:漏洞仍在分析中,openEuler-22.03-LTS-SP3:不修复-超出修复范围,openEuler-24.03-LTS:不修复-超出修复范围,openEuler-24.03-LTS-SP2:不修复-超出修复范围

请确认分析内容的准确性, 确认无误后, 您可以进行后续步骤, 否则您可以继续分析.

likedislike
Tengda Wu
Tengda Wu成员
8月25日 评论:

/check-issue

likedislike
openeuler-ci-bot
openeuler-ci-bot成员
8月25日 评论:

@young-sun 经过 cve-manager 解析, 已分析的内容如下表所示:

状态 分析项目 内容
已分析 1.影响性分析说明 In the Linux kernel, the following vulnerability has been resolved:btrfs: reject free space cache with more entries than pagesWhen loading a v1 free space cache, __load_free_space_cache() takesnum_entries and num_bitmaps straight from the on-diskbtrfs_free_space_header. That header is stored in the tree_root under a keywith type 0, which the tree-checker has no case for, so neither count isvalidated before the load trusts it.The load loops num_entries times and maps the next page whenever the currentone runs out, going through io_ctl_check_crc() -> io_ctl_map_page(), whichdoes io_ctl->pages[io_ctl->index++]. But pages[] is allocated inio_ctl_init() from the cache inode's i_size, not from num_entries:num_pages = DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE);io_ctl->pages = kcalloc(num_pages, sizeof(struct page *), GFP_NOFS);So if num_entries claims more records than the pages can hold, io_ctl->indexruns off the end of pages[]. The write side never hits this becauseio_ctl_add_entry() and io_ctl_add_bitmap() both stop onceio_ctl->index >= io_ctl->num_pages; the read side just never had the samecheck.To trigger it, take a clean cache (num_entries = here), set num_entriesin the header to 0x10000, and fix up the leaf checksum so it still passesthe tree-checker. The cache inode has i_size = 65536, so num_pages is 16 andpages[] is a 16-pointer (kmalloc-128) array. The load now tries to read65536 entries, io_ctl->index walks up to 16, and pages[16] is read past thearray: BUG: KASAN: slab-out-of-bounds in io_ctl_check_crc (fs/btrfs/free-space-cache.c:420 fs/btrfs/free-space-cache.c:565) Read of size 8 at addr ffff88800c833a80 by task kworker/u8:3/58 io_ctl_check_crc (fs/btrfs/free-space-cache.c:420 fs/btrfs/free-space-cache.c:565) __load_free_space_cache (fs/btrfs/free-space-cache.c:655 fs/btrfs/free-space-cache.c:820) load_free_space_cache (fs/btrfs/free-space-cache.c:1017) caching_thread (fs/btrfs/block-group.c:880) btrfs_work_helper (fs/btrfs/async-thread.c:312) process_one_work worker_thread kthread ret_from_forkfree-space-cache.c:420 is io_ctl_map_page(), inlined into io_ctl_check_crc()at line 565, which is why that is the frame KASAN names. The out-of-boundsslot is then treated as a struct page and handed to crc32c(), so the badread turns into a GP fault.Add the missing check to io_ctl_check_crc(), which is where both the entryloop and the bitmap loop end up. When num_entries is too large the load nowfails like any corrupt cache: __load_free_space_cache() drops it and rebuildsthe free space from the extent tree, so a valid cache is never rejected.
已分析 2.openEulerScore 7.8
已分析 3.openEulerVector AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
已分析 4.受影响版本排查 master:不受影响,openEuler-20.03-LTS-SP4:受影响,openEuler-22.03-LTS-SP4:受影响,openEuler-24.03-LTS-Next:不受影响,openEuler-24.03-LTS-SP1:受影响,openEuler-24.03-LTS-SP3:受影响,openEuler-24.03-LTS-SP4:受影响,openEuler-22.03-LTS-SP3:受影响,openEuler-24.03-LTS:受影响,openEuler-24.03-LTS-SP2:受影响
已分析 5.是否涉及abi变化 master:否,openEuler-20.03-LTS-SP4:否,openEuler-22.03-LTS-SP4:否,openEuler-24.03-LTS-Next:否,openEuler-24.03-LTS-SP1:否,openEuler-24.03-LTS-SP3:否,openEuler-24.03-LTS-SP4:否,openEuler-22.03-LTS-SP3:否,openEuler-24.03-LTS:否,openEuler-24.03-LTS-SP2:否
已分析 6.原因说明 master:不受影响-漏洞代码不能被攻击者触发,openEuler-20.03-LTS-SP4:不修复-超出修复范围,openEuler-22.03-LTS-SP4:不修复-超出修复范围,openEuler-24.03-LTS-Next:不受影响-漏洞代码不能被攻击者触发,openEuler-24.03-LTS-SP1:漏洞仍在分析中,openEuler-24.03-LTS-SP3:漏洞仍在分析中,openEuler-24.03-LTS-SP4:漏洞仍在分析中,openEuler-22.03-LTS-SP3:不修复-超出修复范围,openEuler-24.03-LTS:不修复-超出修复范围,openEuler-24.03-LTS-SP2:不修复-超出修复范围

请确认分析内容的准确性, 确认无误后, 您可以进行后续步骤, 否则您可以继续分析.

likedislike
fffsqianfffsqian
9月23日 关联了pull request:[OLK-5.10] Fix CVE-2026-64567
fffsqianfffsqian
9月23日 关联了pull request:[openEuler-1.0-LTS] Fix CVE-2026-64567
fffsqian
fffsqian
9月23日 评论:

CVE-2026-64567

影响性分析说明:
In the Linux kernel, the following vulnerability has been resolved:

btrfs: reject free space cache with more entries than pages

When loading a v1 free space cache, __load_free_space_cache() takes
num_entries and num_bitmaps straight from the on-disk
btrfs_free_space_header. That header is stored in the tree_root under a key
with type 0, which the tree-checker has no case for, so neither count is
validated before the load trusts it.

The load loops num_entries times and maps the next page whenever the current
one runs out, going through io_ctl_check_crc() -> io_ctl_map_page(), which
does io_ctl->pages[io_ctl->index++]. But pages[] is allocated in
io_ctl_init() from the cache inode's i_size, not from num_entries:

num_pages = DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE);
io_ctl->pages = kcalloc(num_pages, sizeof(struct page *), GFP_NOFS);

So if num_entries claims more records than the pages can hold, io_ctl->index
runs off the end of pages[]. The write side never hits this because
io_ctl_add_entry() and io_ctl_add_bitmap() both stop once
io_ctl->index >= io_ctl->num_pages; the read side just never had the same
check.

To trigger it, take a clean cache (num_entries = here), set num_entries
in the header to 0x10000, and fix up the leaf checksum so it still passes
the tree-checker. The cache inode has i_size = 65536, so num_pages is 16 and
pages[] is a 16-pointer (kmalloc-128) array. The load now tries to read
65536 entries, io_ctl->index walks up to 16, and pages[16] is read past the
array:

BUG: KASAN: slab-out-of-bounds in io_ctl_check_crc (fs/btrfs/free-space-cache.c:420 fs/btrfs/free-space-cache.c:565)
Read of size 8 at addr ffff88800c833a80 by task kworker/u8:3/58
io_ctl_check_crc (fs/btrfs/free-space-cache.c:420 fs/btrfs/free-space-cache.c:565)
__load_free_space_cache (fs/btrfs/free-space-cache.c:655 fs/btrfs/free-space-cache.c:820)
load_free_space_cache (fs/btrfs/free-space-cache.c:1017)
caching_thread (fs/btrfs/block-group.c:880)
btrfs_work_helper (fs/btrfs/async-thread.c:312)
process_one_work
worker_thread
kthread
ret_from_fork

free-space-cache.c:420 is io_ctl_map_page(), inlined into io_ctl_check_crc()
at line 565, which is why that is the frame KASAN names. The out-of-bounds
slot is then treated as a struct page and handed to crc32c(), so the bad
read turns into a GP fault.

Add the missing check to io_ctl_check_crc(), which is where both the entry
loop and the bitmap loop end up. When num_entries is too large the load now
fails like any corrupt cache: __load_free_space_cache() drops it and rebuilds
the free space from the extent tree, so a valid cache is never rejected.

openEuler评分:(评分和向量)
7.8
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

受影响版本排查(受影响/不受影响):
1.master:不受影响
2.openEuler-20.03-LTS-SP4:受影响
3.openEuler-22.03-LTS-SP3:受影响
4.openEuler-22.03-LTS-SP4:受影响
5.openEuler-24.03-LTS:受影响
6.openEuler-24.03-LTS-Next:不受影响
7.openEuler-24.03-LTS-SP1:受影响
8.openEuler-24.03-LTS-SP2:受影响
9.openEuler-24.03-LTS-SP3:受影响
10.openEuler-24.03-LTS-SP4:受影响

修复是否涉及abi变化(是/否):
1.master:否
2.openEuler-20.03-LTS-SP4:否
3.openEuler-22.03-LTS-SP3:否
4.openEuler-22.03-LTS-SP4:否
5.openEuler-24.03-LTS:否
6.openEuler-24.03-LTS-Next:否
7.openEuler-24.03-LTS-SP1:否
8.openEuler-24.03-LTS-SP2:否
9.openEuler-24.03-LTS-SP3:否
10.openEuler-24.03-LTS-SP4:否

原因说明:
1.master:不受影响-漏洞代码不能被攻击者触发
2.openEuler-20.03-LTS-SP4:正常修复
3.openEuler-22.03-LTS-SP3:不修复-超出修复范围
4.openEuler-22.03-LTS-SP4:正常修复
5.openEuler-24.03-LTS:不修复-超出修复范围
6.openEuler-24.03-LTS-Next:不受影响-漏洞代码不能被攻击者触发
7.openEuler-24.03-LTS-SP1:正常修复
8.openEuler-24.03-LTS-SP2:不修复-超出修复范围
9.openEuler-24.03-LTS-SP3:正常修复
10.openEuler-24.03-LTS-SP4:正常修复

likedislike
openeuler-ci-botopeneuler-ci-bot成员
9月23日 修改了issue 的描述
openeuler-ci-bot
openeuler-ci-bot成员
9月23日 评论:

@young-sun 经过 cve-manager 解析, 已分析的内容如下表所示:

状态 分析项目 内容
已分析 1.影响性分析说明 In the Linux kernel, the following vulnerability has been resolved:btrfs: reject free space cache with more entries than pagesWhen loading a v1 free space cache, __load_free_space_cache() takesnum_entries and num_bitmaps straight from the on-diskbtrfs_free_space_header. That header is stored in the tree_root under a keywith type 0, which the tree-checker has no case for, so neither count isvalidated before the load trusts it.The load loops num_entries times and maps the next page whenever the currentone runs out, going through io_ctl_check_crc() -> io_ctl_map_page(), whichdoes io_ctl->pages[io_ctl->index++]. But pages[] is allocated inio_ctl_init() from the cache inode's i_size, not from num_entries:num_pages = DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE);io_ctl->pages = kcalloc(num_pages, sizeof(struct page *), GFP_NOFS);So if num_entries claims more records than the pages can hold, io_ctl->indexruns off the end of pages[]. The write side never hits this becauseio_ctl_add_entry() and io_ctl_add_bitmap() both stop onceio_ctl->index >= io_ctl->num_pages; the read side just never had the samecheck.To trigger it, take a clean cache (num_entries = here), set num_entriesin the header to 0x10000, and fix up the leaf checksum so it still passesthe tree-checker. The cache inode has i_size = 65536, so num_pages is 16 andpages[] is a 16-pointer (kmalloc-128) array. The load now tries to read65536 entries, io_ctl->index walks up to 16, and pages[16] is read past thearray:BUG: KASAN: slab-out-of-bounds in io_ctl_check_crc (fs/btrfs/free-space-cache.c:420 fs/btrfs/free-space-cache.c:565)Read of size 8 at addr ffff88800c833a80 by task kworker/u8:3/58io_ctl_check_crc (fs/btrfs/free-space-cache.c:420 fs/btrfs/free-space-cache.c:565)__load_free_space_cache (fs/btrfs/free-space-cache.c:655 fs/btrfs/free-space-cache.c:820)load_free_space_cache (fs/btrfs/free-space-cache.c:1017)caching_thread (fs/btrfs/block-group.c:880)btrfs_work_helper (fs/btrfs/async-thread.c:312)process_one_workworker_threadkthreadret_from_forkfree-space-cache.c:420 is io_ctl_map_page(), inlined into io_ctl_check_crc()at line 565, which is why that is the frame KASAN names. The out-of-boundsslot is then treated as a struct page and handed to crc32c(), so the badread turns into a GP fault.Add the missing check to io_ctl_check_crc(), which is where both the entryloop and the bitmap loop end up. When num_entries is too large the load nowfails like any corrupt cache: __load_free_space_cache() drops it and rebuildsthe free space from the extent tree, so a valid cache is never rejected.
已分析 2.openEulerScore 7.8
已分析 3.openEulerVector AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
已分析 4.受影响版本排查 master:不受影响,openEuler-20.03-LTS-SP4:受影响,openEuler-22.03-LTS-SP4:受影响,openEuler-24.03-LTS-Next:不受影响,openEuler-24.03-LTS-SP1:受影响,openEuler-24.03-LTS-SP3:受影响,openEuler-24.03-LTS-SP4:受影响,openEuler-22.03-LTS-SP3:受影响,openEuler-24.03-LTS:受影响,openEuler-24.03-LTS-SP2:受影响
已分析 5.是否涉及abi变化 master:否,openEuler-20.03-LTS-SP4:否,openEuler-22.03-LTS-SP4:否,openEuler-24.03-LTS-Next:否,openEuler-24.03-LTS-SP1:否,openEuler-24.03-LTS-SP3:否,openEuler-24.03-LTS-SP4:否,openEuler-22.03-LTS-SP3:否,openEuler-24.03-LTS:否,openEuler-24.03-LTS-SP2:否
已分析 6.原因说明 master:不受影响-漏洞代码不能被攻击者触发,openEuler-20.03-LTS-SP4:正常修复,openEuler-22.03-LTS-SP4:正常修复,openEuler-24.03-LTS-Next:不受影响-漏洞代码不能被攻击者触发,openEuler-24.03-LTS-SP1:正常修复,openEuler-24.03-LTS-SP3:正常修复,openEuler-24.03-LTS-SP4:正常修复,openEuler-22.03-LTS-SP3:不修复-超出修复范围,openEuler-24.03-LTS:不修复-超出修复范围,openEuler-24.03-LTS-SP2:不修复-超出修复范围

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9月23日 评论:

经过cve-manager解析,部分分支PR未合入,如红色字体所示:

原因说明:
1.master:不受影响-漏洞代码不能被攻击者触发
2.openEuler-20.03-LTS-SP4:正常修复(PR未合入)
3.openEuler-22.03-LTS-SP4:正常修复(PR未合入)
4.openEuler-24.03-LTS-Next:不受影响-漏洞代码不能被攻击者触发
5.openEuler-24.03-LTS-SP1:正常修复(PR未合入)
6.openEuler-24.03-LTS-SP3:正常修复(PR未合入)
7.openEuler-24.03-LTS-SP4:正常修复(PR未合入)
8.openEuler-22.03-LTS-SP3:不修复-超出修复范围
9.openEuler-24.03-LTS:不修复-超出修复范围
10.openEuler-24.03-LTS-SP2:不修复-超出修复范围

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