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Improper Update of Reference Count The advisory has been revoked - it doesn't affect any version of package libperf  (opens in a new tab)

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0.13% (3rd percentile)

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  • Snyk IDSNYK-CENTOS10-LIBPERF-17604336
  • published27 Jun 2026
  • disclosed24 Jun 2026
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Introduced: 24 Jun 2026

CVE-2026-52990  (opens in a new tab)
CWE-911  (opens in a new tab)

Amendment

The Centos security team deemed this advisory irrelevant for Centos:10.

NVD Description

Note: Versions mentioned in the description apply only to the upstream libperf package and not the libperf package as distributed by Centos.

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).