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CVE-2026-52990: Linux

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Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)

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    Описание

    Оригинално описание

    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).

    Засегнати продукти

    • Linux Linux: c3638b5b13740fa31762d414bbce8b7a694e582a преди ba4d88bfd58739698a9bd2309659c9cc26acf7f7; c3638b5b13740fa31762d414bbce8b7a694e582a преди 926ec3937b28d30c08427053c8d8af7f9e086d82; c3638b5b13740fa31762d414bbce8b7a694e582a преди 8c8afa6444e6bdc145d2bf2f3aeeca6da3e36b42; c3638b5b13740fa31762d414bbce8b7a694e582a преди b740cc86816bbc87902ae9db74cd21abde3c8d63; c3638b5b13740fa31762d414bbce8b7a694e582a преди 5c80289503da3658e3df80280598c68d181eadbd; c3638b5b13740fa31762d414bbce8b7a694e582a преди 4aca914ac152f5d055ddcb36704d1e539ac08977; ff34ebaa6f6dc1eebce6a8d6f12a1566f33d00fe; 4f145b67c075324b13d6ae7d5abb6e7a1dbac26d; 5.10.220 преди 5.11; 5.15.154 преди 5.16
    • Linux Linux: 5.19; преди 5.19; 6.1.191 до 6.1.*; 6.6.160 до 6.6.*; 6.12.91 до 6.12.*; 6.18.33 до 6.18.*; 7.0.10 до 7.0.*; от 7.1 нататък

    История

    • 24 юни 2026 Публикувано

    Други уязвимости в Linux Linux

    Първоизточници

    CVE-2026-52990: Linux | freedomonline.bg