CVE-2026-89491

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-89491", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.713Z", "datePublished": "2026-09-11T19:43:43.466Z", "dateUpdated": "2026-10-19T08:47:43.000Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:47:43.000Z"}, "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": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/ocfs2/cluster/heartbeat.c"], "versions": [{"version": "58a3158a5d17ddf4894db9e8ccaf92093ff8e42e", "lessThan": "4d64f8da82fb9e8dbd5aa9b64c9bb6ac0decea03", "status": "affected", "versionType": "git"}, {"version": "58a3158a5d17ddf4894db9e8ccaf92093ff8e42e", "lessThan": "3b790774280a610f8bdbd5d4260a07345bcf8e04", "status": "affected", "versionType": "git"}, {"version": "58a3158a5d17ddf4894db9e8ccaf92093ff8e42e", "lessThan": "0cbc2f20a6ea7b4a59efa9171b7c694cdd196507", "status": "affected", "versionType": "git"}, {"version": "58a3158a5d17ddf4894db9e8ccaf92093ff8e42e", "lessThan": "c9be4de77f97f383b750698e1517fd296041f4bb", "status": "affected", "versionType": "git"}, {"version": "58a3158a5d17ddf4894db9e8ccaf92093ff8e42e", "lessThan": "49002acc520c61002ad195894ac391c94317d3ba", "status": "affected", "versionType": "git"}, {"version": "58a3158a5d17ddf4894db9e8ccaf92093ff8e42e", "lessThan": "ce035f208d68b812d83e5482980f2b1c88a9cd94", "status": "affected", "versionType": "git"}, {"version": "58a3158a5d17ddf4894db9e8ccaf92093ff8e42e", "lessThan": "470212a5eefabcc16b8e2f7fe2844b8737fe571c", "status": "affected", "versionType": "git"}, {"version": "58a3158a5d17ddf4894db9e8ccaf92093ff8e42e", "lessThan": "af09df89db9a68a1d76df0f75667998135bc8d65", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/ocfs2/cluster/heartbeat.c"], "versions": [{"version": "2.6.38", "status": "affected"}, {"version": "0", "lessThan": "2.6.38", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.270", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.221", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.188", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.157", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.109", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.50", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.4", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "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"}]}]}], "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"}], "title": "ocfs2: cluster: don't sleep while holding o2hb_live_lock in o2hb_region_pin()", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/ocfs2/cluster/heartbeat.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "4d64f8da82fb9e8dbd5aa9b64c9bb6ac0decea03", "status": "affected", "version": "58a3158a5d17ddf4894db9e8ccaf92093ff8e42e", "versionType": "git"}, {"lessThan": "3b790774280a610f8bdbd5d4260a07345bcf8e04", "status": "affected", "version": "58a3158a5d17ddf4894db9e8ccaf92093ff8e42e", "versionType": "git"}, {"lessThan": "0cbc2f20a6ea7b4a59efa9171b7c694cdd196507", "status": "affected", "version": "58a3158a5d17ddf4894db9e8ccaf92093ff8e42e", "versionType": "git"}, {"lessThan": "c9be4de77f97f383b750698e1517fd296041f4bb", "status": "affected", "version": "58a3158a5d17ddf4894db9e8ccaf92093ff8e42e", "versionType": "git"}, {"lessThan": "49002acc520c61002ad195894ac391c94317d3ba", "status": "affected", "version": "58a3158a5d17ddf4894db9e8ccaf92093ff8e42e", "versionType": "git"}, {"lessThan": "ce035f208d68b812d83e5482980f2b1c88a9cd94", "status": "affected", "version": "58a3158a5d17ddf4894db9e8ccaf92093ff8e42e", "versionType": "git"}, {"lessThan": "470212a5eefabcc16b8e2f7fe2844b8737fe571c", "status": "affected", "version": "58a3158a5d17ddf4894db9e8ccaf92093ff8e42e", "versionType": "git"}, {"lessThan": "af09df89db9a68a1d76df0f75667998135bc8d65", "status": "affected", "version": "58a3158a5d17ddf4894db9e8ccaf92093ff8e42e", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/ocfs2/cluster/heartbeat.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "2.6.38"}, {"lessThan": "2.6.38", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.270", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.221", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.188", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.157", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.109", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.50", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.4", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "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."}], "id": "CVE-2026-89491", "lastModified": "2026-10-19T09:17:42.920", "metrics": {}, "published": "2026-09-11T20:19:30.943", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0cbc2f20a6ea7b4a59efa9171b7c694cdd196507"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/3b790774280a610f8bdbd5d4260a07345bcf8e04"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/470212a5eefabcc16b8e2f7fe2844b8737fe571c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/49002acc520c61002ad195894ac391c94317d3ba"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/4d64f8da82fb9e8dbd5aa9b64c9bb6ac0decea03"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/af09df89db9a68a1d76df0f75667998135bc8d65"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c9be4de77f97f383b750698e1517fd296041f4bb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ce035f208d68b812d83e5482980f2b1c88a9cd94"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: Linux kernel: ocfs2 cluster module vulnerable to denial of service due to sleeping function called from invalid context", "id": "2532444", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2532444"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.4", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-663", "details": ["A flaw was found in the Linux kernel's ocfs2 cluster module. This vulnerability allows a local attacker to trigger a denial of service. The issue arises when a sleeping function is called while a spinlock is held within the o2hb_region_pin() function, which can lead to a system crash or deadlock. This can result in the affected system becoming unresponsive."], "name": "CVE-2026-89491", "public_date": "2026-09-11T19:43:43Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-89491\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-89491\nhttps://git.kernel.org/stable/c/470212a5eefabcc16b8e2f7fe2844b8737fe571c\nhttps://git.kernel.org/stable/c/49002acc520c61002ad195894ac391c94317d3ba\nhttps://git.kernel.org/stable/c/af09df89db9a68a1d76df0f75667998135bc8d65\nhttps://git.kernel.org/stable/c/ce035f208d68b812d83e5482980f2b1c88a9cd94"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[58a3158a5d17ddf4894db9e8ccaf92093ff8e42e,49002acc520c61002ad195894ac391c94317d3ba)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[58a3158a5d17ddf4894db9e8ccaf92093ff8e42e,ce035f208d68b812d83e5482980f2b1c88a9cd94)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[58a3158a5d17ddf4894db9e8ccaf92093ff8e42e,470212a5eefabcc16b8e2f7fe2844b8737fe571c)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[58a3158a5d17ddf4894db9e8ccaf92093ff8e42e,af09df89db9a68a1d76df0f75667998135bc8d65)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "2.6.38"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,2.6.38)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.109,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.50,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.4,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3-rc1,*)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-09-12T10:15:12.236490+00:00", "updated": "2026-09-15T22:45:07.203533+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}