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vuln-cve/data/2026/53xxx/CVE-2026-53309.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-53309",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2026-06-09T07:44:35.397Z",
"datePublished": "2026-06-26T19:41:03.505Z",
"dateUpdated": "2026-08-05T12:34:59.157Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-08-05T12:34:59.157Z"
},
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2/dlm: fix off-by-one in dlm_match_regions() region comparison\n\nThe local-vs-remote region comparison loop uses '<=' instead of '<',\ncausing it to read one entry past the valid range of qr_regions. The\nother loops in the same function correctly use '<'.\n\nFix the loop condition to use '<' for consistency and correctness."
}
],
"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_QUERY_REGION is received and dispatched by the ocfs2 o2net TCP cluster transport, so the vulnerable comparison is reached through network messages from a peer node.\nAC:L - A peer that can reach the OCFS2 cluster transport can deterministically drive the join sequence and send a crafted region list; the off-by-one comparison is not a race and needs no unusual timing.\nPR:N - The receive path does not require credentials or a local account on the target; it relies on cluster node/IP/heartbeat state rather than authenticated target privileges.\nUI:N - Once the OCFS2/DLM cluster service is running, exploitation is driven entirely by network protocol messages and requires no victim user action.\nS:U - The vulnerable component and resulting kernel/cluster filesystem effects remain within the same kernel and OCFS2 cluster security authority.\nC:H - The bug is an out-of-bounds read of a region-sized entry beyond the valid qr_regions range, driven by attacker-supplied network state; under the required kernel scoring guidance, non-trivial out-of-bounds reads are treated as high confidentiality impact.\nI:H - The off-by-one can let a joining node pass heartbeat-region validation with an inconsistent region set, undermining DLM cluster membership safety and enabling severe shared-filesystem integrity corruption in a plausible OCFS2 deployment.\nA:H - Accepting inconsistent heartbeat regions can lead to cluster miscoordination, fencing, hangs, or filesystem disruption, and the malformed query can be sent without user interaction once the join path is reachable."
}
]
}
],
"affected": [
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"fs/ocfs2/dlm/dlmdomain.c"
],
"versions": [
{
"version": "ea2034416b54700e30371f2ad6517cbb94674083",
"lessThan": "760ab35040aca8399021fdb9ff1db1089feb7194",
"status": "affected",
"versionType": "git"
},
{
"version": "ea2034416b54700e30371f2ad6517cbb94674083",
"lessThan": "c60a2710b73838d250cda57344c049b89abc5d52",
"status": "affected",
"versionType": "git"
},
{
"version": "ea2034416b54700e30371f2ad6517cbb94674083",
"lessThan": "2a0673836f019e7c032acbf48d022d5ccf02a845",
"status": "affected",
"versionType": "git"
},
{
"version": "ea2034416b54700e30371f2ad6517cbb94674083",
"lessThan": "819d8ebad3200a53de99bd7e297bc428e41ced54",
"status": "affected",
"versionType": "git"
},
{
"version": "ea2034416b54700e30371f2ad6517cbb94674083",
"lessThan": "d5403ae28085761d58b555645bc7d5feadb10073",
"status": "affected",
"versionType": "git"
},
{
"version": "ea2034416b54700e30371f2ad6517cbb94674083",
"lessThan": "1fb7f356547d9688822315cd2b205ff0bd5429b4",
"status": "affected",
"versionType": "git"
},
{
"version": "ea2034416b54700e30371f2ad6517cbb94674083",
"lessThan": "426cd8eedac89b86148d4478990eeef16e8a2520",
"status": "affected",
"versionType": "git"
},
{
"version": "ea2034416b54700e30371f2ad6517cbb94674083",
"lessThan": "01b61e8dda9b0fdb0d4cda43de25f4e390554d7b",
"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/dlmdomain.c"
],
"versions": [
{
"version": "2.6.37",
"status": "affected"
},
{
"version": "0",
"lessThan": "2.6.37",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.10.258",
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.15.209",
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.1.175",
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.6.141",
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.12.91",
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.18.33",
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "7.0.10",
"lessThanOrEqual": "7.0.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "7.1",
"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": "2.6.37",
"versionEndExcluding": "5.10.258"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "2.6.37",
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"versionStartIncluding": "2.6.37",
"versionEndExcluding": "7.0.10"
},
{
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "2.6.37",
"versionEndExcluding": "7.1"
}
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}
],
"references": [
{
"url": "https://git.kernel.org/stable/c/760ab35040aca8399021fdb9ff1db1089feb7194"
},
{
"url": "https://git.kernel.org/stable/c/c60a2710b73838d250cda57344c049b89abc5d52"
},
{
"url": "https://git.kernel.org/stable/c/2a0673836f019e7c032acbf48d022d5ccf02a845"
},
{
"url": "https://git.kernel.org/stable/c/819d8ebad3200a53de99bd7e297bc428e41ced54"
},
{
"url": "https://git.kernel.org/stable/c/d5403ae28085761d58b555645bc7d5feadb10073"
},
{
"url": "https://git.kernel.org/stable/c/1fb7f356547d9688822315cd2b205ff0bd5429b4"
},
{
"url": "https://git.kernel.org/stable/c/426cd8eedac89b86148d4478990eeef16e8a2520"
},
{
"url": "https://git.kernel.org/stable/c/01b61e8dda9b0fdb0d4cda43de25f4e390554d7b"
}
],
"title": "ocfs2/dlm: fix off-by-one in dlm_match_regions() region comparison",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
}
}
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