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CVE-2026-89491: 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: ocfs2: cluster: don't sleep while holding o2hb_live_lock in o2hb_region_pin() Patch series "ocfs2: cluster: o2hb_region_pin() fixes", v2. This series fixes three related issues in o2hb_region_pin(), all are from the original implementation in commit: 58a3158a5d17 ("ocfs2/cluster: Pin/unpin o2hb regions"): 1) It is called with o2hb_live_lock (a spinlock) held, but the underlying configfs_depend_item() sleeps (takes inode rwsem and pins the filesystem). This triggers BUG under CONFIG_DEBUG_ATOMIC_SLEEP. 2) When called from the configfs drop_item callback, it creates a lock order inversion: parent inode_lock -> configfs root inode_lock, which can deadlock against subsystem unregistration paths taking root -> parent. 3) If pinning fails partway through o2hb_region_inc_user(), the o2hb_dependent_users counter is leaked and partially-pinned regions are never released, leaving heartbeat regions unprotected on subsequent mounts. Patch 1 reworks o2hb_region_pin() to drop o2hb_live_lock across each sleeping configfs_depend_item() call, using a config_item reference to keep the region alive while unlocked. Patch 2 adds a from_callback parameter to select configfs_depend_item_unlocked() when called from configfs context, avoiding the inode_lock nesting. Patch 3 fixes the error path in o2hb_region_inc_user() to unpin and decrement the counter on failure. This patch (of 3): o2hb_region_pin() is always called with the o2hb_live_lock spinlock held (from o2hb_region_inc_user() and o2hb_heartbeat_group_drop_item()), but it calls o2nm_depend_item() -> configfs_depend_item(), which sleeps: it pins the configfs filesystem and takes the configfs root inode rwsem. Under CONFIG_DEBUG_ATOMIC_SLEEP this triggers: BUG: sleeping function called from invalid context at kernel/locking/rwsem.c in_atomic(): 1, ... name: mount.ocfs2 down_write configfs_depend_item o2hb_regio

    Засегнати продукти

    • Linux Linux: 58a3158a5d17ddf4894db9e8ccaf92093ff8e42e преди 4d64f8da82fb9e8dbd5aa9b64c9bb6ac0decea03; 58a3158a5d17ddf4894db9e8ccaf92093ff8e42e преди 3b790774280a610f8bdbd5d4260a07345bcf8e04; 58a3158a5d17ddf4894db9e8ccaf92093ff8e42e преди 0cbc2f20a6ea7b4a59efa9171b7c694cdd196507; 58a3158a5d17ddf4894db9e8ccaf92093ff8e42e преди c9be4de77f97f383b750698e1517fd296041f4bb; 58a3158a5d17ddf4894db9e8ccaf92093ff8e42e преди 49002acc520c61002ad195894ac391c94317d3ba; 58a3158a5d17ddf4894db9e8ccaf92093ff8e42e преди ce035f208d68b812d83e5482980f2b1c88a9cd94; 58a3158a5d17ddf4894db9e8ccaf92093ff8e42e преди 470212a5eefabcc16b8e2f7fe2844b8737fe571c; 58a3158a5d17ddf4894db9e8ccaf92093ff8e42e преди af09df89db9a68a1d76df0f75667998135bc8d65
    • Linux Linux: 2.6.38; преди 2.6.38; 5.10.270 до 5.10.*; 5.15.221 до 5.15.*; 6.1.188 до 6.1.*; 6.6.157 до 6.6.*; 6.12.109 до 6.12.*; 6.18.50 до 6.18.*; 7.2.4 до 7.2.*; от 7.3 нататък

    История

    • 11 септември 2026 Публикувано

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    Първоизточници

    CVE-2026-89491: Linux | freedomonline.bg