CVE-2026-89494 (GCVE-0-2026-89494)
Vulnerability from cvelistv5 – Published: 2026-09-11 19:43 – Updated: 2026-09-11 19:43
VLAI
EPSS
VEX
Title
ocfs2: validate lengths in dlm_mig_lockres_handler
Summary
In the Linux kernel, the following vulnerability has been resolved:
ocfs2: validate lengths in dlm_mig_lockres_handler
A node receiving a DLM_MIG_LOCKRES message trusts several fields of the
peer-supplied dlm_migratable_lockres without validation. num_locks and
lockname_len are bounded only on the sending side, and the message is
never checked to actually carry num_locks migratable_lock entries. As a
result dlm_process_recovery_data() walks mres->ml[0..num_locks) past the
kmalloc(data_len) copy of the message (an out-of-bounds read that ends in
a BUG_ON panic), and dlm_init_lockres() copies lockname_len bytes into the
fixed 32-byte o2dlm_lockname slab object (a heap out-of-bounds write).
Both are reachable by any node in the domain.
Validate these fields right after dlm_grab(), before anything uses them --
including the not-joined error path, which already prints mres->lockname
with the unbounded lockname_len as a %.*s precision. Reject the message
unless lockname_len <= DLM_LOCKID_NAME_MAX, num_locks <=
DLM_MAX_MIGRATABLE_LOCKS (the bound the sender already asserts), and the
payload is large enough to hold the claimed locks. Conforming recovery
and migration messages are unaffected.
Severity
No CVSS data available.
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
6714d8e86bf443f6f7af50f9d432025649f091f5 , < f33041906885f96e190cde54e61ddc69de39e3ee
(git)
Affected: 6714d8e86bf443f6f7af50f9d432025649f091f5 , < 50c4cc9183e11f83427efbf770f54851f4471c02 (git) Affected: 6714d8e86bf443f6f7af50f9d432025649f091f5 , < a8facb1670b4a0612183198e758d9539ef628ed9 (git) Affected: 6714d8e86bf443f6f7af50f9d432025649f091f5 , < b54e03d9b3697d25f4a0063cf717d459c5e3ad94 (git) |
guessed | |
| Linux | Linux |
Affected:
2.6.16
Unaffected: 0 , < 2.6.16 (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) |
guessed |
{
"containers": {
"cna": {
"affected": [
{
"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": "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": "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-rc1",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.109",
"versionStartIncluding": "2.6.16",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.50",
"versionStartIncluding": "2.6.16",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.2.4",
"versionStartIncluding": "2.6.16",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.3-rc1",
"versionStartIncluding": "2.6.16",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"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-\u003eml[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-\u003elockname\nwith the unbounded lockname_len as a %.*s precision. Reject the message\nunless lockname_len \u003c= DLM_LOCKID_NAME_MAX, num_locks \u003c=\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."
}
],
"providerMetadata": {
"dateUpdated": "2026-09-11T19:43:45.455Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"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"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-89494",
"datePublished": "2026-09-11T19:43:45.455Z",
"dateReserved": "2026-09-11T19:38:34.714Z",
"dateUpdated": "2026-09-11T19:43:45.455Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-89494",
"date": "2026-09-12",
"epss": "0.002",
"percentile": "0.09962"
},
"nvd": "{\"cve\":{\"id\":\"CVE-2026-89494\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-09-11T20:19:31.370\",\"lastModified\":\"2026-09-11T20:19:31.370\",\"vulnStatus\":\"Received\",\"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-\u003eml[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-\u003elockname\\nwith the unbounded lockname_len as a %.*s precision. Reject the message\\nunless lockname_len \u003c= DLM_LOCKID_NAME_MAX, num_locks \u003c=\\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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/ocfs2/dlm/dlmrecovery.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6714d8e86bf443f6f7af50f9d432025649f091f5\",\"lessThan\":\"f33041906885f96e190cde54e61ddc69de39e3ee\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6714d8e86bf443f6f7af50f9d432025649f091f5\",\"lessThan\":\"50c4cc9183e11f83427efbf770f54851f4471c02\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6714d8e86bf443f6f7af50f9d432025649f091f5\",\"lessThan\":\"a8facb1670b4a0612183198e758d9539ef628ed9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6714d8e86bf443f6f7af50f9d432025649f091f5\",\"lessThan\":\"b54e03d9b3697d25f4a0063cf717d459c5e3ad94\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/ocfs2/dlm/dlmrecovery.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.16\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.16\",\"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/50c4cc9183e11f83427efbf770f54851f4471c02\",\"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/f33041906885f96e190cde54e61ddc69de39e3ee\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
"redhat_vex": {
"aggregate_severity": "Important",
"current_release_date": "2026-09-11T20:51:56+00:00",
"cve": "CVE-2026-89494",
"id": "CVE-2026-89494",
"initial_release_date": "2026-09-11T19:43:45.455000+00:00",
"product_status:known_affected": "2",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: ocfs2: Arbitrary Code Execution via DLM migration message handling",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89494.json",
"version": "3"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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
| Author | Source | Type | Date | Other |
|---|
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.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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