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GHSA-MWWG-VQ2V-V2C8

Vulnerability from github – Published: 2026-08-15 06:32 – Updated: 2026-08-15 06:32
VLAI
Details

In the Linux kernel, the following vulnerability has been resolved:

lockd: Plug nlm_file refcount leak on cached nlm_do_fopen() failure

The cached-file path in nlm_lookup_file() reaches the found: label unconditionally, even when nlm_do_fopen() fails. At that label result and file->f_count are updated before the error is returned. The wrappers nlm3svc_lookup_file() and nlm4svc_lookup_file() then bail out of their switch without copying result back to their caller, so the proc handler's local nlm_file pointer remains NULL and the cleanup path skips nlm_release_file(). The f_count increment is never released, and nlm_traverse_files() can no longer reap the file because its refcount never returns to zero between requests.

Short-circuit the cached path so neither *result nor f_count is touched when nlm_do_fopen() fails on a hashed nlm_file.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-72218"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T06:21:40Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nlockd: Plug nlm_file refcount leak on cached nlm_do_fopen() failure\n\nThe cached-file path in nlm_lookup_file() reaches the found: label\nunconditionally, even when nlm_do_fopen() fails. At that label\n*result and file-\u003ef_count are updated before the error is returned.\nThe wrappers nlm3svc_lookup_file() and nlm4svc_lookup_file() then\nbail out of their switch without copying *result back to their\ncaller, so the proc handler\u0027s local nlm_file pointer remains NULL\nand the cleanup path skips nlm_release_file(). The f_count\nincrement is never released, and nlm_traverse_files() can no\nlonger reap the file because its refcount never returns to zero\nbetween requests.\n\nShort-circuit the cached path so neither *result nor f_count is\ntouched when nlm_do_fopen() fails on a hashed nlm_file.",
  "id": "GHSA-mwwg-vq2v-v2c8",
  "modified": "2026-08-15T06:32:16Z",
  "published": "2026-08-15T06:32:16Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72218"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3a5c55a19cad62f2973be25fe96a1a9e7f618e8a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/46d59ff421824b6483549d87f14efffbbbd1f6cb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6cd84cefd8b73e85b9eda17b319bd40a670f3a38"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/70a38f87bed7f0694fd07988b47b2db1e10d8df3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7ce4c23e783e766507b2cef27bbf97e9ca944f1a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/84008bf1860e0ef8059a7583a1163f36b704d08a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cb3420c047957e565101585bb4f15e1a6e3de6b0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fe3b45b56b6c3d4b6b341de27fa291005287a21c"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}



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