CVE-2026-53309 (GCVE-0-2026-53309)
Vulnerability from cvelistv5
Published
2026-06-26 19:41
Modified
2026-08-05 12:34
Severity ?
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: ocfs2/dlm: fix off-by-one in dlm_match_regions() region comparison The local-vs-remote region comparison loop uses '<=' instead of '<', causing it to read one entry past the valid range of qr_regions. The other loops in the same function correctly use '<'. Fix the loop condition to use '<' for consistency and correctness.
References
Impacted products
Vendor Product Version
Linux Linux Version: ea2034416b54700e30371f2ad6517cbb94674083
Version: ea2034416b54700e30371f2ad6517cbb94674083
Version: ea2034416b54700e30371f2ad6517cbb94674083
Version: ea2034416b54700e30371f2ad6517cbb94674083
Version: ea2034416b54700e30371f2ad6517cbb94674083
Version: ea2034416b54700e30371f2ad6517cbb94674083
Version: ea2034416b54700e30371f2ad6517cbb94674083
Version: ea2034416b54700e30371f2ad6517cbb94674083
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/ocfs2/dlm/dlmdomain.c"
          ],
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          "vendor": "Linux",
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          "product": "Linux",
          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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              "version": "2.6.37"
            },
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.258",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.209",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.175",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.141",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.91",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.33",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.258",
                  "versionStartIncluding": "2.6.37",
                  "vulnerable": true
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                  "vulnerable": true
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                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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 \u0027\u003c=\u0027 instead of \u0027\u003c\u0027,\ncausing it to read one entry past the valid range of qr_regions.  The\nother loops in the same function correctly use \u0027\u003c\u0027.\n\nFix the loop condition to use \u0027\u003c\u0027 for consistency and correctness."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "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."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:34:59.157Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "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"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-53309",
    "datePublished": "2026-06-26T19:41:03.505Z",
    "dateReserved": "2026-06-09T07:44:35.397Z",
    "dateUpdated": "2026-08-05T12:34:59.157Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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