CVE-2026-52990
Full vulnerability record from the local CVENow database.
Description
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).
View original CVE JSON
{
"id": "CVE-2026-52990",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2026-06-24T17:17:09.833",
"lastModified": "2026-10-30T13:19:05.530",
"vulnStatus": "Modified",
"cveTags": [],
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"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfsnotify: fix inode reference leak in fsnotify_recalc_mask()\n\nfsnotify_recalc_mask() fails to handle the return value of\n__fsnotify_recalc_mask(), which may return an inode pointer that needs\nto be released via fsnotify_drop_object() when the connector's HAS_IREF\nflag transitions from set to cleared.\n\nThis manifests as a hung task with the following call trace:\n\n INFO: task umount:1234 blocked for more than 120 seconds.\n Call Trace:\n __schedule\n schedule\n fsnotify_sb_delete\n generic_shutdown_super\n kill_anon_super\n cleanup_mnt\n task_work_run\n do_exit\n do_group_exit\n\nThe race window that triggers the iref leak:\n\n Thread A (adding mark) Thread B (removing mark)\n ────────────────────── ────────────────────────\n fsnotify_add_mark_locked():\n fsnotify_add_mark_list():\n spin_lock(conn->lock)\n add mark_B(evictable) to list\n spin_unlock(conn->lock)\n return\n\n /* ---- gap: no lock held ---- */\n\n fsnotify_detach_mark(mark_A):\n spin_lock(mark_A->lock)\n clear ATTACHED flag on mark_A\n spin_unlock(mark_A->lock)\n fsnotify_put_mark(mark_A)\n\n fsnotify_recalc_mask():\n spin_lock(conn->lock)\n __fsnotify_recalc_mask():\n /* mark_A skipped: ATTACHED cleared */\n /* only mark_B(evictable) remains */\n want_iref = false\n has_iref = true /* not yet cleared */\n -> HAS_IREF transitions true -> false\n -> returns inode pointer\n spin_unlock(conn->lock)\n /* BUG: return value discarded!\n * iput() and fsnotify_put_sb_watched_objects()\n * are never called */\n\nFix this by deferring the transition true -> false of HAS_IREF flag from\nfsnotify_recalc_mask() (Thread A) to fsnotify_put_mark() (thread B)."
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