fsnotify: fix inode reference leak in fsnotify_recalc_mask()
In the Linux kernel, the following vulnerability has been resolved: fsnotify: fix inode reference leak in fsnotify_recalc_mask() fsnotify_recalc_mask() fails to handle the return value of __fsnotify_recalc_mask(), which may return an inode pointer that needs to be released via fsnotify_drop_object() when the connector's HAS_IREF flag transitions from set to cleared. This manifests as a hung task with the following call trace: INFO: task umount:1234 blocked for more than 120 seconds. Call Trace: __schedule schedule fsnotify_sb_delete generic_shutdown_super kill_anon_super cleanup_mnt task_work_run do_exit do_group_exit The race window that triggers the iref leak: Thread A (adding mark) Thread B (removing mark) ────────────────────── ──────────────────────── fsnotify_add_mark_locked(): fsnotify_add_mark_list(): spin_lock(conn->lock) add mark_B(evictable) to list spin_unlock(conn->lock) return /* ---- gap: no lock held ---- */ fsnotify_detach_mark(mark_A): spin_lock(mark_A->lock) clear ATTACHED flag on mark_A spin_unlock(mark_A->lock) fsnotify_put_mark(mark_A) fsnotify_recalc_mask(): spin_lock(conn->lock) __fsnotify_recalc_mask(): /* mark_A skipped: ATTACHED cleared */ /* only mark_B(evictable) remains */ want_iref = false has_iref = true /* not yet cleared */ -> HAS_IREF transitions true -> false -> returns inode pointer spin_unlock(conn->lock) /* BUG: return value discarded! * iput() and fsnotify_put_sb_watched_objects() * are never called */ Fix this by deferring the transiti
CVE-2026-52990
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-2026-52990
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": "c3638b5b13740fa31762d414bbce8b7a694e582a",
"lessThan": "926ec3937b28d30c08427053c8d8af7f9e086d82",
"versionType": "git"
},
{
"status": "affected",
"version": "c3638b5b13740fa31762d414bbce8b7a694e582a",
"lessThan": "8c8afa6444e6bdc145d2bf2f3aeeca6da3e36b42",
"versionType": "git"
},
{
"status": "affected",
"version": "c3638b5b13740fa31762d414bbce8b7a694e582a",
"lessThan": "b740cc86816bbc87902ae9db74cd21abde3c8d63",
"versionType": "git"
},
{
"status": "affected",
"version": "c3638b5b13740fa31762d414bbce8b7a694e582a",
"lessThan": "5c80289503da3658e3df80280598c68d181eadbd",
"versionType": "git"
},
{
"status": "affected",
"version": "c3638b5b13740fa31762d414bbce8b7a694e582a",
"lessThan": "4aca914ac152f5d055ddcb36704d1e539ac08977",
"versionType": "git"
},
{
"status": "affected",
"version": "ff34ebaa6f6dc1eebce6a8d6f12a1566f33d00fe",
"versionType": "git"
},
{
"status": "affected",
"version": "4f145b67c075324b13d6ae7d5abb6e7a1dbac26d",
"versionType": "git"
},
{
"status": "affected",
"version": "5.10.220",
"lessThan": "5.11",
"versionType": "semver"
},
{
"status": "affected",
"version": "5.15.154",
"lessThan": "5.16",
"versionType": "semver"
}
],
"programFiles": [
"fs/notify/mark.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.19"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.19",
"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/notify/mark.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-52990
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #46349 · Revision 1
- Added to Heist Feed
- Publisher date