{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-89494",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-89494"
  ],
  "published": "2026-09-11T19:47:07Z",
  "summary": "ocfs2: validate lengths in dlm_mig_lockres_handler",
  "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->ml[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->lockname\nwith the unbounded lockname_len as a %.*s precision.  Reject the message\nunless lockname_len <= DLM_LOCKID_NAME_MAX, num_locks <=\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.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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            "linux_commit": "89050b1059997d38d55462b323b099a6436dc10d",
            "upstream_version": "6.12.75",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.12.109"
          },
          "1:6.18.29-1+rpt1": {
            "linux_commit": "66318c5b5cd8145a662303af12ed39ac07eb27cc",
            "upstream_version": "6.18.29",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.50"
          },
          "1:6.18.33-1+rpt1": {
            "linux_commit": "95b85bebbedcaedfa7ca79116ed38b7376fba412",
            "upstream_version": "6.18.33",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.50"
          },
          "1:6.18.34-1+rpt1": {
            "linux_commit": "c8c7494100e99ee05b11aaa4f0588a223a63d1af",
            "upstream_version": "6.18.34",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.50"
          },
          "1:6.18.39-1+rpt1": {
            "linux_commit": "60ea684a8ace97bb0db1a16e20753bdd6ab371ff",
            "upstream_version": "6.18.39",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.50"
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-89494"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/4a5798253212093b9ff7d90c6cfbe348bcda1594"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/dce05b17db862f47ff60614017abe639b2e71cad"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/0e999d56917f861f97adb961617b1828c9eb4733"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/77686fa5bba135252d348e2dacf481fc19f60c41"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f33041906885f96e190cde54e61ddc69de39e3ee"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/50c4cc9183e11f83427efbf770f54851f4471c02"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a8facb1670b4a0612183198e758d9539ef628ed9"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b54e03d9b3697d25f4a0063cf717d459c5e3ad94"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-09-14T12:06:03Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 9.8,
      "cvss_v3_severity": "Critical",
      "scenario": "AV:N - DLM_MIG_LOCKRES is received and dispatched by the ocfs2 o2net TCP cluster transport, so dlm_mig_lockres_handler() is reached through network protocol messages from a peer node.\nAC:L - A cluster peer can send a crafted DLM_MIG_LOCKRES with attacker-chosen lockname_len and num_locks; the heap overflow and BUG_ON are deterministic and require no race or other condition outside the attacker's control.\nPR:N - o2net gates peers by configured node IP, heartbeat, and the DLM domain key, with no user authentication or target-local privilege check before the handler runs, so exploitation needs no account on the victim.\nUI:N - Once the OCFS2/DLM domain is joined, exploitation is driven entirely by attacker-sent o2net messages and requires no victim user action such as mounting or opening a file.\nS:U - The heap corruption and resulting kernel impact remain within the same kernel and OCFS2 cluster-node security authority and do not cross a guest-to-host or IOMMU boundary.\nC:H - Unchecked lockname_len and num_locks produce a heap out-of-bounds write of attacker-controlled bytes and an out-of-bounds read past the kmalloc message copy, which can disclose adjacent kernel memory.\nI:H - dlm_init_lockres() memcpy()s up to 255 attacker-controlled bytes into a 32-byte o2dlm_lockname slab object, a heap out-of-bounds write that can overwrite adjacent objects and hijack kernel control flow.\nA:H - dlm_process_recovery_data() walks mres->ml[] past the allocated message and hits BUG_ON, and the heap overflow can oops or panic the receiving node."
    }
  }
}