{
  "affected": [
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:12",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.1.176-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:13",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.12.94-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:14",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "7.0.10-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "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 '\u003c=' instead of '\u003c', 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 \u003e 32 causes out-of-bounds reads past the qr_regions buffer.  Add a bounds check for qr_numregions before entering the loops.",
  "id": "DEBIAN-CVE-2026-53043",
  "modified": "2026-09-14T16:47:34.081271379Z",
  "published": "2026-06-24T17:17:16.063Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-53043"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "upstream": [
    "CVE-2026-53043"
  ]
}