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CVE-2026-89491 (GCVE-0-2026-89491)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:43 – Updated: 2026-09-14 12:00
VLAI
Title
ocfs2: cluster: don't sleep while holding o2hb_live_lock in o2hb_region_pin()
Summary
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_region_pin o2hb_region_inc_user o2hb_register_callback dlm_register_domain_handlers ... ocfs2_dlm_init ocfs2_mount_volume ocfs2_fill_super Rework o2hb_region_pin() to pin one region at a time with the lock dropped across the sleeping call: under o2hb_live_lock find the next eligible region and take a config_item reference to keep it alive, drop the lock, call o2nm_depend_item(), then retake the lock and record the pin. The config_item_put() is done with the lock released as well, since o2hb_region_release() also acquires o2hb_live_lock and can sleep. The region list may change while unlocked, so the scan restarts from the top after each pin. Local heartbeat still pins only the matching region; global heartbeat pins all eligible regions. The unpin path is unaffected: configfs_undepend_item() only takes a spinlock and does not sleep.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 58a3158a5d17ddf4894db9e8ccaf92093ff8e42e , < 4d64f8da82fb9e8dbd5aa9b64c9bb6ac0decea03 (git)
Affected: 58a3158a5d17ddf4894db9e8ccaf92093ff8e42e , < 3b790774280a610f8bdbd5d4260a07345bcf8e04 (git)
Affected: 58a3158a5d17ddf4894db9e8ccaf92093ff8e42e , < 0cbc2f20a6ea7b4a59efa9171b7c694cdd196507 (git)
Affected: 58a3158a5d17ddf4894db9e8ccaf92093ff8e42e , < c9be4de77f97f383b750698e1517fd296041f4bb (git)
Affected: 58a3158a5d17ddf4894db9e8ccaf92093ff8e42e , < 49002acc520c61002ad195894ac391c94317d3ba (git)
Affected: 58a3158a5d17ddf4894db9e8ccaf92093ff8e42e , < ce035f208d68b812d83e5482980f2b1c88a9cd94 (git)
Affected: 58a3158a5d17ddf4894db9e8ccaf92093ff8e42e , < 470212a5eefabcc16b8e2f7fe2844b8737fe571c (git)
Affected: 58a3158a5d17ddf4894db9e8ccaf92093ff8e42e , < af09df89db9a68a1d76df0f75667998135bc8d65 (git)
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Linux Linux Affected: 2.6.38
Unaffected: 0 , < 2.6.38 (semver)
Unaffected: 5.10.270 , ≤ 5.10.* (semver)
Unaffected: 5.15.221 , ≤ 5.15.* (semver)
Unaffected: 6.1.188 , ≤ 6.1.* (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.109 , ≤ 6.12.* (semver)
Unaffected: 6.18.50 , ≤ 6.18.* (semver)
Unaffected: 7.2.4 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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{
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: cluster: don\u0027t 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 -\u003e configfs root\n   inode_lock, which can deadlock against subsystem unregistration\n   paths taking root -\u003e 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() -\u003e 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."
        }
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        "dateUpdated": "2026-09-14T12:00:26.760Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/3b790774280a610f8bdbd5d4260a07345bcf8e04"
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        {
          "url": "https://git.kernel.org/stable/c/470212a5eefabcc16b8e2f7fe2844b8737fe571c"
        },
        {
          "url": "https://git.kernel.org/stable/c/af09df89db9a68a1d76df0f75667998135bc8d65"
        }
      ],
      "title": "ocfs2: cluster: don\u0027t sleep while holding o2hb_live_lock in o2hb_region_pin()",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89491",
    "datePublished": "2026-09-11T19:43:43.466Z",
    "dateReserved": "2026-09-11T19:38:34.713Z",
    "dateUpdated": "2026-09-14T12:00:26.760Z",
    "state": "PUBLISHED"
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  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-89491",
      "date": "2026-09-16",
      "epss": "0.0021",
      "percentile": "0.11451"
    },
    "microsoft_vex": {
      "current_release_date": "2026-09-15T01:47:44.000Z",
      "cve": "CVE-2026-89491",
      "id": "msrc_CVE-2026-89491",
      "initial_release_date": "2026-09-13T01:10:07.000Z",
      "product_status:known_not_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "ocfs2: cluster: don\u0027t sleep while holding o2hb_live_lock in o2hb_region_pin()",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-89491.json",
      "version": "3"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2026-89491\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-09-11T20:19:30.943\",\"lastModified\":\"2026-09-14T13:19:06.090\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nocfs2: cluster: don\u0027t 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 -\u003e configfs root\\n   inode_lock, which can deadlock against subsystem unregistration\\n   paths taking root -\u003e 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() -\u003e 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\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/ocfs2/cluster/heartbeat.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"58a3158a5d17ddf4894db9e8ccaf92093ff8e42e\",\"lessThan\":\"4d64f8da82fb9e8dbd5aa9b64c9bb6ac0decea03\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"58a3158a5d17ddf4894db9e8ccaf92093ff8e42e\",\"lessThan\":\"3b790774280a610f8bdbd5d4260a07345bcf8e04\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"58a3158a5d17ddf4894db9e8ccaf92093ff8e42e\",\"lessThan\":\"0cbc2f20a6ea7b4a59efa9171b7c694cdd196507\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"58a3158a5d17ddf4894db9e8ccaf92093ff8e42e\",\"lessThan\":\"c9be4de77f97f383b750698e1517fd296041f4bb\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"58a3158a5d17ddf4894db9e8ccaf92093ff8e42e\",\"lessThan\":\"49002acc520c61002ad195894ac391c94317d3ba\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"58a3158a5d17ddf4894db9e8ccaf92093ff8e42e\",\"lessThan\":\"ce035f208d68b812d83e5482980f2b1c88a9cd94\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"58a3158a5d17ddf4894db9e8ccaf92093ff8e42e\",\"lessThan\":\"470212a5eefabcc16b8e2f7fe2844b8737fe571c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"58a3158a5d17ddf4894db9e8ccaf92093ff8e42e\",\"lessThan\":\"af09df89db9a68a1d76df0f75667998135bc8d65\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/ocfs2/cluster/heartbeat.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.38\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.38\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.270\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.221\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.188\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.157\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.109\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.50\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2.4\",\"lessThanOrEqual\":\"7.2.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.3-rc1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"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\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-09-15T12:46:23+00:00",
      "cve": "CVE-2026-89491",
      "id": "CVE-2026-89491",
      "initial_release_date": "2026-09-11T00:00:00+00:00",
      "product_status:known_not_affected": "276",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ocfs2: cluster: don\u0027t sleep while holding o2hb_live_lock in o2hb_region_pin()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89491.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-16T00:02:57Z",
      "cve": "CVE-2026-89491",
      "id": "CVE-2026-89491",
      "initial_release_date": "2026-09-16T00:02:57Z",
      "product_status:known_affected": "353",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-89491",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-89491.json",
      "version": "2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.