ocfs2: bound namelen in dlm_migrate_request_handler

{
  "id": "146647fdab82ff67e13e7e222e9e432176ce13074472ec5e29c581a1258d11a2",
  "url": "https://osv.dev/vulnerability/CVE-2026-89495",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "ocfs2: bound namelen in dlm_migrate_request_handler",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: ocfs2: bound namelen in dlm_migrate_request_handler Patch series \"ocfs2/dlm: bound peer-controlled lengths in the o2dlm\". The o2dlm receive handlers trust u8 length and count fields from the wire without bounding them, so a node in a DLM domain can corrupt or panic any other node with a malformed message. Three defects: - dlm_migrate_request_handler() passes migrate->namelen unchecked to dlm_init_mle(), which memcpy()s it into the 32-byte mname[] of an o2dlm_mle slab object: a heap out-of-bounds write of up to ~215 attacker-controlled bytes. - dlm_mig_lockres_handler() passes mres->lockname_len unchecked to dlm_init_lockres(), which memcpy()s it into the 32-byte o2dlm_lockname slab object: a heap out-of-bounds write of up to ~223 bytes. - the same handler trusts mres->num_locks without checking that the message is large enough to hold that many entries, so dlm_process_recovery_data() walks mres->ml[] past the kmalloc(data_len) copy and trips a BUG_ON (an out-of-bounds read ending in a panic). The other o2dlm receive handlers already reject an oversized name; the migration and recovery handlers have omitted it since the DLM was added (see the Fixes tags). Patch 1 bounds namelen; patch 2 validates lockname_len, num_locks, and the payload size. Conforming recovery and migration traffic is unaffected. o2net authenticates peers only by the DLM domain key, so any node that has joined the domain -- including a compr",
    "evidence": "osv:CVE-2026-89495",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.10.270",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.15.221",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.188",
            "evidence": "/affected/1/ranges"
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            "value": "6.6.157",
            "evidence": "/affected/1/ranges"
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            "evidence": "/affected/1/ranges"
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        "affected_versions": []
      }
    ],
    "severity": "critical",
    "structured": {
      "id": "CVE-2026-89495",
      "aliases": [
        "CVE-2026-89495"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
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              "type": "ECOSYSTEM",
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                  "introduced": "2.6.16"
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      ],
      "modified": "2026-10-28T02:30:40.252979869Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/006c96ea488eca2ef5155ec76038e0a4dbf65f0a",
        "https://git.kernel.org/stable/c/2487bea2098322669f0563baff53e797486b823f",
        "https://git.kernel.org/stable/c/24989909d3413b44b104102caa6661b1e424ba0f",
        "https://git.kernel.org/stable/c/aabc5d8388e6f8826345f0073455dbcaaaa6491d",
        "https://git.kernel.org/stable/c/de10cd3b062a5235af754925fcf49beb5a1109d4",
        "https://git.kernel.org/stable/c/e1288865b8ceac0dcd1009ecba43de961f13d5bd",
        "https://git.kernel.org/stable/c/ea5b5609305a8437bc955a0834a530c12246d78f",
        "https://git.kernel.org/stable/c/f8658ee3327f73bd81c0bcd07cdeb5a8527fac98",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89495.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-89495",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89495.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-89495",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 507834,
  "published_at": "2026-09-11T19:43:46.107+00:00"
}