fs/mbcache: cancel shrink work before destroying the cache

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Summary

CVECVE-2026-53129
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-24 17:17:28 UTC
Updated2026-06-24 17:17:28 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: fs/mbcache: cancel shrink work before destroying the cache mb_cache_destroy() calls shrinker_free() and then frees all cache entries and the cache itself, but it does not cancel the pending c_shrink_work work item first. If mb_cache_entry_create() schedules c_shrink_work via schedule_work() and the work item is still pending or running when mb_cache_destroy() runs, mb_cache_shrink_worker() will access the cache after its memory has been freed, causing a use-after-free. This is only reachable by a privileged user (root or CAP_SYS_ADMIN) who can trigger the last put of a mounted ext2/ext4/ocfs2 filesystem. Cancel the work item with cancel_work_sync() before calling shrinker_free(), ensuring the worker has finished and will not be rescheduled before the cache is torn down.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected c2f3140fe2eceb3a6c1615b2648b9471544881c6 a88d39a74a208e197c03bffaa2df34de732af19f git Not specified
CNA Linux Linux affected c2f3140fe2eceb3a6c1615b2648b9471544881c6 0e4eff315d799f5842b95872199b0f0fb8ef5f51 git Not specified
CNA Linux Linux affected c2f3140fe2eceb3a6c1615b2648b9471544881c6 b25fd3523bef88fb7ffd4c5b63bbe9c08f73bb4c git Not specified
CNA Linux Linux affected c2f3140fe2eceb3a6c1615b2648b9471544881c6 d227786ab1119669df4dc333a61510c52047cce4 git Not specified
CNA Linux Linux affected 4.6 Not specified
CNA Linux Linux unaffected 4.6 semver Not specified
CNA Linux Linux unaffected 6.12.91 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.33 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.10 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/d227786ab1119669df4dc333a61510c52047cce4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b25fd3523bef88fb7ffd4c5b63bbe9c08f73bb4c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0e4eff315d799f5842b95872199b0f0fb8ef5f51 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a88d39a74a208e197c03bffaa2df34de732af19f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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