CVE-2026-52990
- Source
- https://cve.org/CVERecord?id=CVE-2026-52990
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-52990.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-52990
- Downstream
AZL (1)
BELL (1)
DEBIAN (1)
ECHO (1)
OESA (2)
openSUSE (1)
ROOT (4)
SUSE (10)
- Related
- Published
- 2026-06-24T16:29:04Z
- Modified
- 2026-10-08T02:51:04Z
- Summary
- fsnotify: fix inode reference leak in fsnotify_recalc_mask()
- Details
-
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 transition true -> false of HAS_IREF flag from fsnotify_recalc_mask() (Thread A) to fsnotify_put_mark() (thread B).
- Database specific
{ "cna_assigner": "Linux", "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52990.json" }- References
-
- https://git.kernel.org/stable/c/4aca914ac152f5d055ddcb36704d1e539ac08977
- https://git.kernel.org/stable/c/5c80289503da3658e3df80280598c68d181eadbd
- https://git.kernel.org/stable/c/8c8afa6444e6bdc145d2bf2f3aeeca6da3e36b42
- https://git.kernel.org/stable/c/b740cc86816bbc87902ae9db74cd21abde3c8d63
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52990.json
- https://nvd.nist.gov/vuln/detail/CVE-2026-52990
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected packages
Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected ranges
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introducedc3638b5b13740fa31762d414bbce8b7a694e582aFixed8c8afa6444e6bdc145d2bf2f3aeeca6da3e36b42Fixedb740cc86816bbc87902ae9db74cd21abde3c8d63Fixed5c80289503da3658e3df80280598c68d181eadbdFixed4aca914ac152f5d055ddcb36704d1e539ac08977
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced5.10.220Fixed5.11
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced5.15.154Fixed5.16
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introducedff34ebaa6f6dc1eebce6a8d6f12a1566f33d00fe
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced4f145b67c075324b13d6ae7d5abb6e7a1dbac26d