{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "6714d8e86bf443f6f7af50f9d432025649f091f5"
            },
            {
              "fixed": "4a5798253212093b9ff7d90c6cfbe348bcda1594"
            },
            {
              "fixed": "dce05b17db862f47ff60614017abe639b2e71cad"
            },
            {
              "fixed": "0e999d56917f861f97adb961617b1828c9eb4733"
            },
            {
              "fixed": "77686fa5bba135252d348e2dacf481fc19f60c41"
            },
            {
              "fixed": "f33041906885f96e190cde54e61ddc69de39e3ee"
            },
            {
              "fixed": "50c4cc9183e11f83427efbf770f54851f4471c02"
            },
            {
              "fixed": "a8facb1670b4a0612183198e758d9539ef628ed9"
            },
            {
              "fixed": "b54e03d9b3697d25f4a0063cf717d459c5e3ad94"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.6.16"
            },
            {
              "fixed": "5.10.270"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.221"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.188"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.157"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.109"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.50"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89494.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: validate lengths in dlm_mig_lockres_handler\n\nA node receiving a DLM_MIG_LOCKRES message trusts several fields of the\npeer-supplied dlm_migratable_lockres without validation.  num_locks and\nlockname_len are bounded only on the sending side, and the message is\nnever checked to actually carry num_locks migratable_lock entries.  As a\nresult dlm_process_recovery_data() walks mres-\u003eml[0..num_locks) past the\nkmalloc(data_len) copy of the message (an out-of-bounds read that ends in\na BUG_ON panic), and dlm_init_lockres() copies lockname_len bytes into the\nfixed 32-byte o2dlm_lockname slab object (a heap out-of-bounds write). \nBoth are reachable by any node in the domain.\n\nValidate these fields right after dlm_grab(), before anything uses them --\nincluding the not-joined error path, which already prints mres-\u003elockname\nwith the unbounded lockname_len as a %.*s precision.  Reject the message\nunless lockname_len \u003c= DLM_LOCKID_NAME_MAX, num_locks \u003c=\nDLM_MAX_MIGRATABLE_LOCKS (the bound the sender already asserts), and the\npayload is large enough to hold the claimed locks.  Conforming recovery\nand migration messages are unaffected.",
  "id": "CVE-2026-89494",
  "modified": "2026-09-16T03:30:58.271174835Z",
  "published": "2026-09-11T19:43:45.455Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0e999d56917f861f97adb961617b1828c9eb4733"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4a5798253212093b9ff7d90c6cfbe348bcda1594"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/50c4cc9183e11f83427efbf770f54851f4471c02"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/77686fa5bba135252d348e2dacf481fc19f60c41"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a8facb1670b4a0612183198e758d9539ef628ed9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b54e03d9b3697d25f4a0063cf717d459c5e3ad94"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/dce05b17db862f47ff60614017abe639b2e71cad"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f33041906885f96e190cde54e61ddc69de39e3ee"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89494.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89494"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "ocfs2: validate lengths in dlm_mig_lockres_handler"
}