{"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"}}}}