{ "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:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.37", "versionEndExcluding": "5.15.209" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.37", "versionEndExcluding": "6.1.175" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.37", "versionEndExcluding": "6.6.141" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.37", "versionEndExcluding": "6.12.91" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.37", "versionEndExcluding": "6.18.33" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.37", "versionEndExcluding": "7.0.10" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.37", "versionEndExcluding": "7.1" } ] } ] } ], "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" } } } }