CVE-2026-53129fs/mbcache: cancel shrink work before destroying the cache
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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In 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.
- CVSS
- 7.8 HIGH (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Oct 21, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from c2f3140fe2eceb3a6c1615b2648b9471544881c6 before cbdd6f0fb19a0ce8a013acd80ac87a62f57fa20d; from c2f3140fe2eceb3a6c1615b2648b9471544881c6 before a88d39a74a208e197c03bffaa2df34de732af19f; from c2f3140fe2eceb3a6c1615b2648b9471544881c6 before 0e4eff315d799f5842b95872199b0f0fb8ef5f51; from c2f3140fe2eceb3a6c1615b2648b9471544881c6 before b25fd3523bef88fb7ffd4c5b63bbe9c08f73bb4c; from c2f3140fe2eceb3a6c1615b2648b9471544881c6 before d227786ab1119669df4dc333a61510c52047cce4 | CNA record |
linux linux_kernel linux:linux_kernel | from 4.6 before 6.12.91; from 6.13 before 6.18.33; from 6.19 before 7.0.10 | NVD |
References
- https://git.kernel.org/stable/c/cbdd6f0fb19a0ce8a013acd80ac87a62f57fa20d
- https://git.kernel.org/stable/c/a88d39a74a208e197c03bffaa2df34de732af19fpatch
- https://git.kernel.org/stable/c/0e4eff315d799f5842b95872199b0f0fb8ef5f51patch
- https://git.kernel.org/stable/c/b25fd3523bef88fb7ffd4c5b63bbe9c08f73bb4cpatch
- https://git.kernel.org/stable/c/d227786ab1119669df4dc333a61510c52047cce4patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.