CVE-2026-72218 (GCVE-0-2026-72218)
Vulnerability from cvelistv5
Published
2026-08-15 05:54
Modified
2026-08-17 05:10
Severity ?
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: e580323ac0b51ad10ec2e181d1f777479b7983e7
Version: 7f024fcd5c97dc70bb9121c80407cf3cf9be7159
Version: 7f024fcd5c97dc70bb9121c80407cf3cf9be7159
Version: 7f024fcd5c97dc70bb9121c80407cf3cf9be7159
Version: 7f024fcd5c97dc70bb9121c80407cf3cf9be7159
Version: 7f024fcd5c97dc70bb9121c80407cf3cf9be7159
Version: 7f024fcd5c97dc70bb9121c80407cf3cf9be7159
Version: 7f024fcd5c97dc70bb9121c80407cf3cf9be7159
Version: 5.10.220   ≤
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{
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          "defaultStatus": "unaffected",
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          "programFiles": [
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              "versionType": "original_commit_for_fix"
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      "cpeApplicability": [
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              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:10:33.204Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/6cd84cefd8b73e85b9eda17b319bd40a670f3a38"
        },
        {
          "url": "https://git.kernel.org/stable/c/fe3b45b56b6c3d4b6b341de27fa291005287a21c"
        },
        {
          "url": "https://git.kernel.org/stable/c/cb3420c047957e565101585bb4f15e1a6e3de6b0"
        },
        {
          "url": "https://git.kernel.org/stable/c/7ce4c23e783e766507b2cef27bbf97e9ca944f1a"
        },
        {
          "url": "https://git.kernel.org/stable/c/84008bf1860e0ef8059a7583a1163f36b704d08a"
        },
        {
          "url": "https://git.kernel.org/stable/c/46d59ff421824b6483549d87f14efffbbbd1f6cb"
        },
        {
          "url": "https://git.kernel.org/stable/c/3a5c55a19cad62f2973be25fe96a1a9e7f618e8a"
        },
        {
          "url": "https://git.kernel.org/stable/c/70a38f87bed7f0694fd07988b47b2db1e10d8df3"
        }
      ],
      "title": "lockd: Plug nlm_file refcount leak on cached nlm_do_fopen() failure",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-72218",
    "datePublished": "2026-08-15T05:54:11.672Z",
    "dateReserved": "2026-08-09T03:40:39.913Z",
    "dateUpdated": "2026-08-17T05:10:33.204Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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