fs/mbcache: cancel shrink work before destroying the cache
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.
CVE-2026-53129
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-53129
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "c2f3140fe2eceb3a6c1615b2648b9471544881c6",
"lessThan": "cbdd6f0fb19a0ce8a013acd80ac87a62f57fa20d",
"versionType": "git"
},
{
"status": "affected",
"version": "c2f3140fe2eceb3a6c1615b2648b9471544881c6",
"lessThan": "a88d39a74a208e197c03bffaa2df34de732af19f",
"versionType": "git"
},
{
"status": "affected",
"version": "c2f3140fe2eceb3a6c1615b2648b9471544881c6",
"lessThan": "0e4eff315d799f5842b95872199b0f0fb8ef5f51",
"versionType": "git"
},
{
"status": "affected",
"version": "c2f3140fe2eceb3a6c1615b2648b9471544881c6",
"lessThan": "b25fd3523bef88fb7ffd4c5b63bbe9c08f73bb4c",
"versionType": "git"
},
{
"status": "affected",
"version": "c2f3140fe2eceb3a6c1615b2648b9471544881c6",
"lessThan": "d227786ab1119669df4dc333a61510c52047cce4",
"versionType": "git"
}
],
"programFiles": [
"fs/mbcache.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.6"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.6",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.91",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.33",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.0.10",
"versionType": "semver",
"lessThanOrEqual": "7.0.*"
},
{
"status": "unaffected",
"version": "7.1",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"fs/mbcache.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-53129
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #46373 · Revision 1
- Added to Heist Feed
- Publisher date