CVE-2026-72218 (GCVE-0-2026-72218)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:54 – Updated: 2026-08-17 05:10
VLAI
Title
lockd: Plug nlm_file refcount leak on cached nlm_do_fopen() failure
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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: e580323ac0b51ad10ec2e181d1f777479b7983e7 , < 6cd84cefd8b73e85b9eda17b319bd40a670f3a38 (git)
Affected: 7f024fcd5c97dc70bb9121c80407cf3cf9be7159 , < fe3b45b56b6c3d4b6b341de27fa291005287a21c (git)
Affected: 7f024fcd5c97dc70bb9121c80407cf3cf9be7159 , < cb3420c047957e565101585bb4f15e1a6e3de6b0 (git)
Affected: 7f024fcd5c97dc70bb9121c80407cf3cf9be7159 , < 7ce4c23e783e766507b2cef27bbf97e9ca944f1a (git)
Affected: 7f024fcd5c97dc70bb9121c80407cf3cf9be7159 , < 84008bf1860e0ef8059a7583a1163f36b704d08a (git)
Affected: 7f024fcd5c97dc70bb9121c80407cf3cf9be7159 , < 46d59ff421824b6483549d87f14efffbbbd1f6cb (git)
Affected: 7f024fcd5c97dc70bb9121c80407cf3cf9be7159 , < 3a5c55a19cad62f2973be25fe96a1a9e7f618e8a (git)
Affected: 7f024fcd5c97dc70bb9121c80407cf3cf9be7159 , < 70a38f87bed7f0694fd07988b47b2db1e10d8df3 (git)
Affected: 5.10.220 , < 5.10.261 (semver)
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Linux Linux Affected: 5.15
Unaffected: 0 , < 5.15 (semver)
Unaffected: 5.10.261 , ≤ 5.10.* (semver)
Unaffected: 5.15.212 , ≤ 5.15.* (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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          "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."
        }
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            "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."
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      "current_release_date": "2026-08-18T08:33:38+00:00",
      "cve": "CVE-2026-72218",
      "id": "CVE-2026-72218",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: lockd: Plug nlm_file refcount leak on cached nlm_do_fopen() failure",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72218.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-15T01:28:06Z",
      "cve": "CVE-2026-72218",
      "id": "CVE-2026-72218",
      "initial_release_date": "2026-08-28T01:00:22Z",
      "product_status:known_affected": "123",
      "product_status:known_not_affected": "239",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-72218",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-72218.json",
      "version": "4"
    }
  }
}



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