{"id":"CVE-2026-89491","state":"PUBLISHED","title":"ocfs2: cluster: don't sleep while holding o2hb_live_lock in o2hb_region_pin()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: cluster: don't sleep while holding o2hb_live_lock in o2hb_region_pin()\n\nPatch series \"ocfs2: cluster: o2hb_region_pin() fixes\", v2.\n\nThis series fixes three related issues in o2hb_region_pin(), all are from\nthe original implementation in commit: 58a3158a5d17 (\"ocfs2/cluster:\nPin/unpin o2hb regions\"):\n\n1) It is called with o2hb_live_lock (a spinlock) held, but the\n   underlying configfs_depend_item() sleeps (takes inode rwsem and\n   pins the filesystem).  This triggers BUG under\n   CONFIG_DEBUG_ATOMIC_SLEEP.\n\n2) When called from the configfs drop_item callback, it creates a\n   lock order inversion: parent inode_lock -> configfs root\n   inode_lock, which can deadlock against subsystem unregistration\n   paths taking root -> parent.\n\n3) If pinning fails partway through o2hb_region_inc_user(), the\n   o2hb_dependent_users counter is leaked and partially-pinned\n   regions are never released, leaving heartbeat regions\n   unprotected on subsequent mounts.\n\nPatch 1 reworks o2hb_region_pin() to drop o2hb_live_lock across each\nsleeping configfs_depend_item() call, using a config_item reference to\nkeep the region alive while unlocked.\n\nPatch 2 adds a from_callback parameter to select\nconfigfs_depend_item_unlocked() when called from configfs context,\navoiding the inode_lock nesting.\n\nPatch 3 fixes the error path in o2hb_region_inc_user() to unpin and\ndecrement the counter on failure.\n\n\nThis patch (of 3):\n\no2hb_region_pin() is always called with the o2hb_live_lock spinlock held\n(from o2hb_region_inc_user() and o2hb_heartbeat_group_drop_item()), but it\ncalls o2nm_depend_item() -> configfs_depend_item(), which sleeps: it pins\nthe configfs filesystem and takes the configfs root inode rwsem.  Under\nCONFIG_DEBUG_ATOMIC_SLEEP this triggers:\n\n  BUG: sleeping function called from invalid context at kernel/locking/rwsem.c\n  in_atomic(): 1, ... name: mount.ocfs2\n    down_write\n    configfs_depend_item\n    o2hb_region_pin\n    o2hb_region_inc_user\n    o2hb_register_callback\n    dlm_register_domain_handlers\n    ...\n    ocfs2_dlm_init\n    ocfs2_mount_volume\n    ocfs2_fill_super\n\nRework o2hb_region_pin() to pin one region at a time with the lock dropped\nacross the sleeping call: under o2hb_live_lock find the next eligible\nregion and take a config_item reference to keep it alive, drop the lock,\ncall o2nm_depend_item(), then retake the lock and record the pin.  The\nconfig_item_put() is done with the lock released as well, since\no2hb_region_release() also acquires o2hb_live_lock and can sleep.  The\nregion list may change while unlocked, so the scan restarts from the top\nafter each pin.  Local heartbeat still pins only the matching region;\nglobal heartbeat pins all eligible regions.\n\nThe unpin path is unaffected: configfs_undepend_item() only takes a\nspinlock and does not sleep.","publishedAt":"2026-09-11T19:43:43.466Z","updatedAt":"2026-10-19T08:47:43.000Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"58a3158a5d17ddf4894db9e8ccaf92093ff8e42e","status":"affected","lessThan":"4d64f8da82fb9e8dbd5aa9b64c9bb6ac0decea03","versionType":"git"},{"version":"58a3158a5d17ddf4894db9e8ccaf92093ff8e42e","status":"affected","lessThan":"3b790774280a610f8bdbd5d4260a07345bcf8e04","versionType":"git"},{"version":"58a3158a5d17ddf4894db9e8ccaf92093ff8e42e","status":"affected","lessThan":"0cbc2f20a6ea7b4a59efa9171b7c694cdd196507","versionType":"git"},{"version":"58a3158a5d17ddf4894db9e8ccaf92093ff8e42e","status":"affected","lessThan":"c9be4de77f97f383b750698e1517fd296041f4bb","versionType":"git"},{"version":"58a3158a5d17ddf4894db9e8ccaf92093ff8e42e","status":"affected","lessThan":"49002acc520c61002ad195894ac391c94317d3ba","versionType":"git"},{"version":"58a3158a5d17ddf4894db9e8ccaf92093ff8e42e","status":"affected","lessThan":"ce035f208d68b812d83e5482980f2b1c88a9cd94","versionType":"git"},{"version":"58a3158a5d17ddf4894db9e8ccaf92093ff8e42e","status":"affected","lessThan":"470212a5eefabcc16b8e2f7fe2844b8737fe571c","versionType":"git"},{"version":"58a3158a5d17ddf4894db9e8ccaf92093ff8e42e","status":"affected","lessThan":"af09df89db9a68a1d76df0f75667998135bc8d65","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/ocfs2/cluster/heartbeat.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.38","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.38","versionType":"semver"},{"version":"5.10.270","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.221","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.188","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.157","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.109","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.50","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.4","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/ocfs2/cluster/heartbeat.c"]}],"references":["https://git.kernel.org/stable/c/4d64f8da82fb9e8dbd5aa9b64c9bb6ac0decea03","https://git.kernel.org/stable/c/3b790774280a610f8bdbd5d4260a07345bcf8e04","https://git.kernel.org/stable/c/0cbc2f20a6ea7b4a59efa9171b7c694cdd196507","https://git.kernel.org/stable/c/c9be4de77f97f383b750698e1517fd296041f4bb","https://git.kernel.org/stable/c/49002acc520c61002ad195894ac391c94317d3ba","https://git.kernel.org/stable/c/ce035f208d68b812d83e5482980f2b1c88a9cd94","https://git.kernel.org/stable/c/470212a5eefabcc16b8e2f7fe2844b8737fe571c","https://git.kernel.org/stable/c/af09df89db9a68a1d76df0f75667998135bc8d65"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:26.108Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/89xxx/CVE-2026-89491.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-89491","state":"PUBLISHED","datePublished":"2026-09-11T19:43:43.466Z","dateUpdated":"2026-10-19T08:47:43.000Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-11T19:38:34.713Z"},"containers":{"cna":{"title":"ocfs2: cluster: don't sleep while holding o2hb_live_lock in o2hb_region_pin()","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: cluster: don't sleep while holding o2hb_live_lock in o2hb_region_pin()\n\nPatch series \"ocfs2: cluster: o2hb_region_pin() fixes\", v2.\n\nThis series fixes three related issues in o2hb_region_pin(), all are from\nthe original implementation in commit: 58a3158a5d17 (\"ocfs2/cluster:\nPin/unpin o2hb regions\"):\n\n1) It is called with o2hb_live_lock (a spinlock) held, but the\n   underlying configfs_depend_item() sleeps (takes inode rwsem and\n   pins the filesystem).  This triggers BUG under\n   CONFIG_DEBUG_ATOMIC_SLEEP.\n\n2) When called from the configfs drop_item callback, it creates a\n   lock order inversion: parent inode_lock -> configfs root\n   inode_lock, which can deadlock against subsystem unregistration\n   paths taking root -> parent.\n\n3) If pinning fails partway through o2hb_region_inc_user(), the\n   o2hb_dependent_users counter is leaked and partially-pinned\n   regions are never released, leaving heartbeat regions\n   unprotected on subsequent mounts.\n\nPatch 1 reworks o2hb_region_pin() to drop o2hb_live_lock across each\nsleeping configfs_depend_item() call, using a config_item reference to\nkeep the region alive while unlocked.\n\nPatch 2 adds a from_callback parameter to select\nconfigfs_depend_item_unlocked() when called from configfs context,\navoiding the inode_lock nesting.\n\nPatch 3 fixes the error path in o2hb_region_inc_user() to unpin and\ndecrement the counter on failure.\n\n\nThis patch (of 3):\n\no2hb_region_pin() is always called with the o2hb_live_lock spinlock held\n(from o2hb_region_inc_user() and o2hb_heartbeat_group_drop_item()), but it\ncalls o2nm_depend_item() -> configfs_depend_item(), which sleeps: it pins\nthe configfs filesystem and takes the configfs root inode rwsem.  Under\nCONFIG_DEBUG_ATOMIC_SLEEP this triggers:\n\n  BUG: sleeping function called from invalid context at kernel/locking/rwsem.c\n  in_atomic(): 1, ... name: mount.ocfs2\n    down_write\n    configfs_depend_item\n    o2hb_region_pin\n    o2hb_region_inc_user\n    o2hb_register_callback\n    dlm_register_domain_handlers\n    ...\n    ocfs2_dlm_init\n    ocfs2_mount_volume\n    ocfs2_fill_super\n\nRework o2hb_region_pin() to pin one region at a time with the lock dropped\nacross the sleeping call: under o2hb_live_lock find the next eligible\nregion and take a config_item reference to keep it alive, drop the lock,\ncall o2nm_depend_item(), then retake the lock and record the pin.  The\nconfig_item_put() is done with the lock released as well, since\no2hb_region_release() also acquires o2hb_live_lock and can sleep.  The\nregion list may change while unlocked, so the scan restarts from the top\nafter each pin.  Local heartbeat still pins only the matching region;\nglobal heartbeat pins all eligible regions.\n\nThe unpin path is unaffected: configfs_undepend_item() only takes a\nspinlock and does not sleep."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"58a3158a5d17ddf4894db9e8ccaf92093ff8e42e","status":"affected","lessThan":"4d64f8da82fb9e8dbd5aa9b64c9bb6ac0decea03","versionType":"git"},{"version":"58a3158a5d17ddf4894db9e8ccaf92093ff8e42e","status":"affected","lessThan":"3b790774280a610f8bdbd5d4260a07345bcf8e04","versionType":"git"},{"version":"58a3158a5d17ddf4894db9e8ccaf92093ff8e42e","status":"affected","lessThan":"0cbc2f20a6ea7b4a59efa9171b7c694cdd196507","versionType":"git"},{"version":"58a3158a5d17ddf4894db9e8ccaf92093ff8e42e","status":"affected","lessThan":"c9be4de77f97f383b750698e1517fd296041f4bb","versionType":"git"},{"version":"58a3158a5d17ddf4894db9e8ccaf92093ff8e42e","status":"affected","lessThan":"49002acc520c61002ad195894ac391c94317d3ba","versionType":"git"},{"version":"58a3158a5d17ddf4894db9e8ccaf92093ff8e42e","status":"affected","lessThan":"ce035f208d68b812d83e5482980f2b1c88a9cd94","versionType":"git"},{"version":"58a3158a5d17ddf4894db9e8ccaf92093ff8e42e","status":"affected","lessThan":"470212a5eefabcc16b8e2f7fe2844b8737fe571c","versionType":"git"},{"version":"58a3158a5d17ddf4894db9e8ccaf92093ff8e42e","status":"affected","lessThan":"af09df89db9a68a1d76df0f75667998135bc8d65","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/ocfs2/cluster/heartbeat.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.38","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.38","versionType":"semver"},{"version":"5.10.270","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.221","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.188","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.157","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.109","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.50","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.4","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/ocfs2/cluster/heartbeat.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/4d64f8da82fb9e8dbd5aa9b64c9bb6ac0decea03"},{"url":"https://git.kernel.org/stable/c/3b790774280a610f8bdbd5d4260a07345bcf8e04"},{"url":"https://git.kernel.org/stable/c/0cbc2f20a6ea7b4a59efa9171b7c694cdd196507"},{"url":"https://git.kernel.org/stable/c/c9be4de77f97f383b750698e1517fd296041f4bb"},{"url":"https://git.kernel.org/stable/c/49002acc520c61002ad195894ac391c94317d3ba"},{"url":"https://git.kernel.org/stable/c/ce035f208d68b812d83e5482980f2b1c88a9cd94"},{"url":"https://git.kernel.org/stable/c/470212a5eefabcc16b8e2f7fe2844b8737fe571c"},{"url":"https://git.kernel.org/stable/c/af09df89db9a68a1d76df0f75667998135bc8d65"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-19T08:47:43.000Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.38","versionEndExcluding":"5.10.270"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.38","versionEndExcluding":"5.15.221"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.38","versionEndExcluding":"6.1.188"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.38","versionEndExcluding":"6.6.157"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.38","versionEndExcluding":"6.12.109"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.38","versionEndExcluding":"6.18.50"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.38","versionEndExcluding":"7.2.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.38","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}