CVE-2026-53043 (GCVE-0-2026-53043)
Vulnerability from cvelistv5
Published
2026-06-24 16:29
Modified
2026-08-05 12:32
Severity ?
9.1 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: ocfs2/dlm: validate qr_numregions in dlm_match_regions() Patch series "ocfs2/dlm: fix two bugs in dlm_match_regions()". In dlm_match_regions(), the qr_numregions field from a DLM_QUERY_REGION network message is used to drive loops over the qr_regions buffer without sufficient validation. This series fixes two issues: - Patch 1 adds a bounds check to reject messages where qr_numregions exceeds O2NM_MAX_REGIONS. The o2net layer only validates message byte length; it does not constrain field values, so a crafted message can set qr_numregions up to 255 and trigger out-of-bounds reads past the 1024-byte qr_regions buffer. - Patch 2 fixes an off-by-one in the local-vs-remote comparison loop, which uses '<=' instead of '<', reading one entry past the valid range even when qr_numregions is within bounds. This patch (of 2): The qr_numregions field from a DLM_QUERY_REGION network message is used directly as loop bounds in dlm_match_regions() without checking against O2NM_MAX_REGIONS. Since qr_regions is sized for at most O2NM_MAX_REGIONS (32) entries, a crafted message with qr_numregions > 32 causes out-of-bounds reads past the qr_regions buffer. Add a bounds check for qr_numregions before entering the loops.
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": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/ocfs2/dlm/dlmdomain.c"
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              "version": "6.12.91",
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              "versionType": "original_commit_for_fix"
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      ],
      "cpeApplicability": [
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          "nodes": [
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              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2/dlm: validate qr_numregions in dlm_match_regions()\n\nPatch series \"ocfs2/dlm: fix two bugs in dlm_match_regions()\".\n\nIn dlm_match_regions(), the qr_numregions field from a DLM_QUERY_REGION\nnetwork message is used to drive loops over the qr_regions buffer without\nsufficient validation.  This series fixes two issues:\n\n- Patch 1 adds a bounds check to reject messages where qr_numregions\n  exceeds O2NM_MAX_REGIONS. The o2net layer only validates message\n  byte length; it does not constrain field values, so a crafted message\n  can set qr_numregions up to 255 and trigger out-of-bounds reads past\n  the 1024-byte qr_regions buffer.\n\n- Patch 2 fixes an off-by-one in the local-vs-remote comparison loop,\n  which uses \u0027\u003c=\u0027 instead of \u0027\u003c\u0027, reading one entry past the valid range\n  even when qr_numregions is within bounds.\n\n\nThis patch (of 2):\n\nThe qr_numregions field from a DLM_QUERY_REGION network message is used\ndirectly as loop bounds in dlm_match_regions() without checking against\nO2NM_MAX_REGIONS.  Since qr_regions is sized for at most O2NM_MAX_REGIONS\n(32) entries, a crafted message with qr_numregions \u003e 32 causes\nout-of-bounds reads past the qr_regions buffer.\n\nAdd a bounds check for qr_numregions before entering the loops."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 9.1,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The vulnerable `DLM_QUERY_REGION` message is received over OCFS2 o2net TCP connections from cluster peers, so the code is reachable via network protocol traffic.\nAC:L - A malicious configured/heartbeating peer can create the DLM join state and send a crafted `qr_numregions` value; no race or condition outside the attacker\u0027s control is required once the cluster service is exposed.\nPR:N - The receiver performs cluster IP/heartbeat gating but no user authentication or target-local privilege check before dispatching the DLM message, so exploitation does not require an account or privileges on the victim.\nUI:N - No victim user action is needed after the OCFS2 cluster/DLM service is running; the attacker sends network messages.\nS:U - The impact remains within the kernel/OCFS2 cluster node security authority and does not cross a separate boundary such as guest-to-host or IOMMU isolation.\nC:H - The attacker-controlled count drives out-of-bounds reads past the fixed `qr_regions` buffer into adjacent kernel memory; under the higher-severity rule, this is a high confidentiality impact.\nI:N - The vulnerable loops perform reads and comparisons/logging only, with no out-of-bounds write or demonstrated control-flow/data modification primitive.\nA:H - The crafted message can force kernel out-of-bounds memory reads from the receive buffer path and can reasonably cause an oops/crash or repeated DLM join failure, so availability impact is high."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:32:50.728Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/d3d5efade0c79dac1cac98c0cb1115432f804439"
        },
        {
          "url": "https://git.kernel.org/stable/c/f69551139caf6d24242a0ad049ee46b264e3aee0"
        },
        {
          "url": "https://git.kernel.org/stable/c/1f8b91275912cd428289c1fb424bebd7ff5302bd"
        },
        {
          "url": "https://git.kernel.org/stable/c/f37de46149db49abd2b24f4f0c5a88cf4dfb5f47"
        },
        {
          "url": "https://git.kernel.org/stable/c/6c6e8fc3c007319981647b410c29bb5775048551"
        },
        {
          "url": "https://git.kernel.org/stable/c/3f474c33ebc2e2ca3fcb587d7de4375348f13373"
        },
        {
          "url": "https://git.kernel.org/stable/c/3c2d0de23ae4be22b6c18e8f0915be74d3b5fb21"
        },
        {
          "url": "https://git.kernel.org/stable/c/7ab3fbb01bc6d79091bc375e5235d360cd9b78be"
        }
      ],
      "title": "ocfs2/dlm: validate qr_numregions in dlm_match_regions()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-53043",
    "datePublished": "2026-06-24T16:29:49.480Z",
    "dateReserved": "2026-06-09T07:44:35.380Z",
    "dateUpdated": "2026-08-05T12:32:50.728Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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