Improper Update of Reference Count Affecting rv package, versions *
Threat Intelligence
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Test your applications- Snyk IDSNYK-CENTOS10-RV-17604353
- published27 Jun 2026
- disclosed24 Jun 2026
Introduced: 24 Jun 2026
NewCVE-2026-52990 (opens in a new tab)How to fix?
There is no fixed version for Centos:10 rv.
NVD Description
Note: Versions mentioned in the description apply only to the upstream rv package and not the rv package as distributed by Centos.
See How to fix? for Centos:10 relevant fixed versions and status.
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).
References
- https://bugzilla.redhat.com/show_bug.cgi?id=2492431
- https://access.redhat.com/security/cve/CVE-2026-52990
- 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