CVE-2026-89494

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-89494", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.714Z", "datePublished": "2026-09-11T19:43:45.455Z", "dateUpdated": "2026-10-19T08:47:45.937Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:47:45.937Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: validate lengths in dlm_mig_lockres_handler\n\nA node receiving a DLM_MIG_LOCKRES message trusts several fields of the\npeer-supplied dlm_migratable_lockres without validation. num_locks and\nlockname_len are bounded only on the sending side, and the message is\nnever checked to actually carry num_locks migratable_lock entries. As a\nresult dlm_process_recovery_data() walks mres->ml[0..num_locks) past the\nkmalloc(data_len) copy of the message (an out-of-bounds read that ends in\na BUG_ON panic), and dlm_init_lockres() copies lockname_len bytes into the\nfixed 32-byte o2dlm_lockname slab object (a heap out-of-bounds write). \nBoth are reachable by any node in the domain.\n\nValidate these fields right after dlm_grab(), before anything uses them --\nincluding the not-joined error path, which already prints mres->lockname\nwith the unbounded lockname_len as a %.*s precision. Reject the message\nunless lockname_len <= DLM_LOCKID_NAME_MAX, num_locks <=\nDLM_MAX_MIGRATABLE_LOCKS (the bound the sender already asserts), and the\npayload is large enough to hold the claimed locks. Conforming recovery\nand migration messages are unaffected."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL"}, "scenarios": [{"lang": "en", "value": "AV:N - DLM_MIG_LOCKRES is received and dispatched by the ocfs2 o2net TCP cluster transport, so dlm_mig_lockres_handler() is reached through network protocol messages from a peer node.\nAC:L - A cluster peer can send a crafted DLM_MIG_LOCKRES with attacker-chosen lockname_len and num_locks; the heap overflow and BUG_ON are deterministic and require no race or other condition outside the attacker's control.\nPR:N - o2net gates peers by configured node IP, heartbeat, and the DLM domain key, with no user authentication or target-local privilege check before the handler runs, so exploitation needs no account on the victim.\nUI:N - Once the OCFS2/DLM domain is joined, exploitation is driven entirely by attacker-sent o2net messages and requires no victim user action such as mounting or opening a file.\nS:U - The heap corruption and resulting kernel impact remain within the same kernel and OCFS2 cluster-node security authority and do not cross a guest-to-host or IOMMU boundary.\nC:H - Unchecked lockname_len and num_locks produce a heap out-of-bounds write of attacker-controlled bytes and an out-of-bounds read past the kmalloc message copy, which can disclose adjacent kernel memory.\nI:H - dlm_init_lockres() memcpy()s up to 255 attacker-controlled bytes into a 32-byte o2dlm_lockname slab object, a heap out-of-bounds write that can overwrite adjacent objects and hijack kernel control flow.\nA:H - dlm_process_recovery_data() walks mres->ml[] past the allocated message and hits BUG_ON, and the heap overflow can oops or panic the receiving node."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/ocfs2/dlm/dlmrecovery.c"], "versions": [{"version": "6714d8e86bf443f6f7af50f9d432025649f091f5", "lessThan": "4a5798253212093b9ff7d90c6cfbe348bcda1594", "status": "affected", "versionType": "git"}, {"version": "6714d8e86bf443f6f7af50f9d432025649f091f5", "lessThan": "dce05b17db862f47ff60614017abe639b2e71cad", "status": "affected", "versionType": "git"}, {"version": "6714d8e86bf443f6f7af50f9d432025649f091f5", "lessThan": "0e999d56917f861f97adb961617b1828c9eb4733", "status": "affected", "versionType": "git"}, {"version": "6714d8e86bf443f6f7af50f9d432025649f091f5", "lessThan": "77686fa5bba135252d348e2dacf481fc19f60c41", "status": "affected", "versionType": "git"}, {"version": "6714d8e86bf443f6f7af50f9d432025649f091f5", "lessThan": "f33041906885f96e190cde54e61ddc69de39e3ee", "status": "affected", "versionType": "git"}, {"version": "6714d8e86bf443f6f7af50f9d432025649f091f5", "lessThan": "50c4cc9183e11f83427efbf770f54851f4471c02", "status": "affected", "versionType": "git"}, {"version": "6714d8e86bf443f6f7af50f9d432025649f091f5", "lessThan": "a8facb1670b4a0612183198e758d9539ef628ed9", "status": "affected", "versionType": "git"}, {"version": "6714d8e86bf443f6f7af50f9d432025649f091f5", "lessThan": "b54e03d9b3697d25f4a0063cf717d459c5e3ad94", "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/dlm/dlmrecovery.c"], "versions": [{"version": "2.6.16", "status": "affected"}, {"version": "0", "lessThan": "2.6.16", "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": "2.6.16", "versionEndExcluding": "5.10.270"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.16", "versionEndExcluding": "5.15.221"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.16", "versionEndExcluding": "6.1.188"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.16", "versionEndExcluding": "6.6.157"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.16", "versionEndExcluding": "6.12.109"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.16", "versionEndExcluding": "6.18.50"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.16", "versionEndExcluding": "7.2.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.16", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/4a5798253212093b9ff7d90c6cfbe348bcda1594"}, {"url": "https://git.kernel.org/stable/c/dce05b17db862f47ff60614017abe639b2e71cad"}, {"url": "https://git.kernel.org/stable/c/0e999d56917f861f97adb961617b1828c9eb4733"}, {"url": "https://git.kernel.org/stable/c/77686fa5bba135252d348e2dacf481fc19f60c41"}, {"url": "https://git.kernel.org/stable/c/f33041906885f96e190cde54e61ddc69de39e3ee"}, {"url": "https://git.kernel.org/stable/c/50c4cc9183e11f83427efbf770f54851f4471c02"}, {"url": "https://git.kernel.org/stable/c/a8facb1670b4a0612183198e758d9539ef628ed9"}, {"url": "https://git.kernel.org/stable/c/b54e03d9b3697d25f4a0063cf717d459c5e3ad94"}], "title": "ocfs2: validate lengths in dlm_mig_lockres_handler", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/ocfs2/dlm/dlmrecovery.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "4a5798253212093b9ff7d90c6cfbe348bcda1594", "status": "affected", "version": "6714d8e86bf443f6f7af50f9d432025649f091f5", "versionType": "git"}, {"lessThan": "dce05b17db862f47ff60614017abe639b2e71cad", "status": "affected", "version": "6714d8e86bf443f6f7af50f9d432025649f091f5", "versionType": "git"}, {"lessThan": "0e999d56917f861f97adb961617b1828c9eb4733", "status": "affected", "version": "6714d8e86bf443f6f7af50f9d432025649f091f5", "versionType": "git"}, {"lessThan": "77686fa5bba135252d348e2dacf481fc19f60c41", "status": "affected", "version": "6714d8e86bf443f6f7af50f9d432025649f091f5", "versionType": "git"}, {"lessThan": "f33041906885f96e190cde54e61ddc69de39e3ee", "status": "affected", "version": "6714d8e86bf443f6f7af50f9d432025649f091f5", "versionType": "git"}, {"lessThan": "50c4cc9183e11f83427efbf770f54851f4471c02", "status": "affected", "version": "6714d8e86bf443f6f7af50f9d432025649f091f5", "versionType": "git"}, {"lessThan": "a8facb1670b4a0612183198e758d9539ef628ed9", "status": "affected", "version": "6714d8e86bf443f6f7af50f9d432025649f091f5", "versionType": "git"}, {"lessThan": "b54e03d9b3697d25f4a0063cf717d459c5e3ad94", "status": "affected", "version": "6714d8e86bf443f6f7af50f9d432025649f091f5", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/ocfs2/dlm/dlmrecovery.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "2.6.16"}, {"lessThan": "2.6.16", "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: validate lengths in dlm_mig_lockres_handler\n\nA node receiving a DLM_MIG_LOCKRES message trusts several fields of the\npeer-supplied dlm_migratable_lockres without validation. num_locks and\nlockname_len are bounded only on the sending side, and the message is\nnever checked to actually carry num_locks migratable_lock entries. As a\nresult dlm_process_recovery_data() walks mres->ml[0..num_locks) past the\nkmalloc(data_len) copy of the message (an out-of-bounds read that ends in\na BUG_ON panic), and dlm_init_lockres() copies lockname_len bytes into the\nfixed 32-byte o2dlm_lockname slab object (a heap out-of-bounds write). \nBoth are reachable by any node in the domain.\n\nValidate these fields right after dlm_grab(), before anything uses them --\nincluding the not-joined error path, which already prints mres->lockname\nwith the unbounded lockname_len as a %.*s precision. Reject the message\nunless lockname_len <= DLM_LOCKID_NAME_MAX, num_locks <=\nDLM_MAX_MIGRATABLE_LOCKS (the bound the sender already asserts), and the\npayload is large enough to hold the claimed locks. Conforming recovery\nand migration messages are unaffected."}], "id": "CVE-2026-89494", "lastModified": "2026-10-19T09:17:43.363", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-09-11T20:19:31.370", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0e999d56917f861f97adb961617b1828c9eb4733"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/4a5798253212093b9ff7d90c6cfbe348bcda1594"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/50c4cc9183e11f83427efbf770f54851f4471c02"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/77686fa5bba135252d348e2dacf481fc19f60c41"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a8facb1670b4a0612183198e758d9539ef628ed9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b54e03d9b3697d25f4a0063cf717d459c5e3ad94"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/dce05b17db862f47ff60614017abe639b2e71cad"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f33041906885f96e190cde54e61ddc69de39e3ee"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: ocfs2: Arbitrary Code Execution via DLM migration message handling", "id": "2532022", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2532022"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.6", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-787", "details": ["A flaw was found in ocfs2, a component of the Linux kernel. A remote attacker, by sending a specially crafted Distributed Lock Manager (DLM) migration message, could exploit a lack of validation in the `dlm_mig_lockres_handler`. This flaw allows for an out-of-bounds write to the heap, potentially leading to arbitrary code execution. Additionally, an out-of-bounds read could cause a system panic, resulting in a denial of service."], "name": "CVE-2026-89494", "package_state": [{"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-09-11T19:43:45Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-89494\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-89494\nhttps://git.kernel.org/stable/c/50c4cc9183e11f83427efbf770f54851f4471c02\nhttps://git.kernel.org/stable/c/a8facb1670b4a0612183198e758d9539ef628ed9\nhttps://git.kernel.org/stable/c/b54e03d9b3697d25f4a0063cf717d459c5e3ad94\nhttps://git.kernel.org/stable/c/f33041906885f96e190cde54e61ddc69de39e3ee"], "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[6714d8e86bf443f6f7af50f9d432025649f091f5,f33041906885f96e190cde54e61ddc69de39e3ee)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[6714d8e86bf443f6f7af50f9d432025649f091f5,50c4cc9183e11f83427efbf770f54851f4471c02)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[6714d8e86bf443f6f7af50f9d432025649f091f5,a8facb1670b4a0612183198e758d9539ef628ed9)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[6714d8e86bf443f6f7af50f9d432025649f091f5,b54e03d9b3697d25f4a0063cf717d459c5e3ad94)"}}], "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": "2.6.16"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,2.6.16)"}}, {"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": "semver", "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": "2026-09-12T07:45:10.384633+00:00", "updated": "2026-09-15T22:45:07.201491+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}