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Critical

lockd: pin next file across nlm_inspect_file lock-drop

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: lockd: pin next file across nlm_inspect_file lock-drop nlm_traverse_files() pins the current file with f_count++ across a mutex_unlock for nlm_inspect_file(), but nothing pins the saved next pointer. A concurrent nlm_release_file() can kfree the next file during the unlock window, and the iterator dereferences freed memory on the next loop step. Pin both current and next before the lock-drop. Advance by swapping the pinned cursors at the end of each iteration so next is always held alive across the unlock. Always call nlm_file_release() after dropping the iteration pin, regardless of whether the file matched the predicate. Use nlm_file_inuse(), which does a live walk of the inode lock list, rather than the cached f_locks field, so skipped files that never ran nlm_inspect_file() are evaluated correctly. Because every file in a hash bucket is now pinned and released, files skipped by the is_failover_file predicate that have no locks, blocks, shares, or external references are deleted during traversal. The old code never evaluated skipped files for cleanup. The new behavior is intentional: such files are stale and should not persist in the table.

Announced Source revision 1
Original source ↗

CVE-2026-89485

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-89485

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "01df9c5e918ae5559f2d96da0143f8bfbb9e6171",
        "lessThan": "e3c413f789eaf0170275c7eba523ead73d963f30",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "01df9c5e918ae5559f2d96da0143f8bfbb9e6171",
        "lessThan": "08a455f87b14c7ff22ae3fdadda62a796a3a5572",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "01df9c5e918ae5559f2d96da0143f8bfbb9e6171",
        "lessThan": "550c19222c7132c888e23c9d89079ba1c9bc4cca",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "01df9c5e918ae5559f2d96da0143f8bfbb9e6171",
        "lessThan": "350087f231c11efcd288c310707c40eab63ca583",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "01df9c5e918ae5559f2d96da0143f8bfbb9e6171",
        "lessThan": "c24bdb7df2f34bdc38ca8a73796f5acb40f1830c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "01df9c5e918ae5559f2d96da0143f8bfbb9e6171",
        "lessThan": "41f0a6d31615fcae261bf28a0aa50050dc93a401",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "01df9c5e918ae5559f2d96da0143f8bfbb9e6171",
        "lessThan": "e999a88133654c6dfc68487fb49da5f20dfa2d4f",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "01df9c5e918ae5559f2d96da0143f8bfbb9e6171",
        "lessThan": "526c49cff3f72c3ec74752016380c7567040581b",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "fs/lockd/svcsubs.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "2.6.18"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "2.6.18",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.270",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.221",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.188",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.157",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.109",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.50",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.4",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "fs/lockd/svcsubs.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-89485

Source reference: /cveMetadata/cveId

Publisher severity

critical

Source reference: /containers/cna/metrics

Event
#35012 · Revision 1
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Publisher date
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