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CVE-2026-89485 (GCVE-0-2026-89485)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:43 – Updated: 2026-09-14 12:00
VLAI
Title
lockd: pin next file across nlm_inspect_file lock-drop
Summary
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.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 01df9c5e918ae5559f2d96da0143f8bfbb9e6171 , < e3c413f789eaf0170275c7eba523ead73d963f30 (git)
Affected: 01df9c5e918ae5559f2d96da0143f8bfbb9e6171 , < 08a455f87b14c7ff22ae3fdadda62a796a3a5572 (git)
Affected: 01df9c5e918ae5559f2d96da0143f8bfbb9e6171 , < 550c19222c7132c888e23c9d89079ba1c9bc4cca (git)
Affected: 01df9c5e918ae5559f2d96da0143f8bfbb9e6171 , < 350087f231c11efcd288c310707c40eab63ca583 (git)
Affected: 01df9c5e918ae5559f2d96da0143f8bfbb9e6171 , < c24bdb7df2f34bdc38ca8a73796f5acb40f1830c (git)
Affected: 01df9c5e918ae5559f2d96da0143f8bfbb9e6171 , < 41f0a6d31615fcae261bf28a0aa50050dc93a401 (git)
Affected: 01df9c5e918ae5559f2d96da0143f8bfbb9e6171 , < e999a88133654c6dfc68487fb49da5f20dfa2d4f (git)
Affected: 01df9c5e918ae5559f2d96da0143f8bfbb9e6171 , < 526c49cff3f72c3ec74752016380c7567040581b (git)
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Linux Linux Affected: 2.6.18
Unaffected: 0 , < 2.6.18 (semver)
Unaffected: 5.10.270 , ≤ 5.10.* (semver)
Unaffected: 5.15.221 , ≤ 5.15.* (semver)
Unaffected: 6.1.188 , ≤ 6.1.* (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.109 , ≤ 6.12.* (semver)
Unaffected: 6.18.50 , ≤ 6.18.* (semver)
Unaffected: 7.2.4 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nlockd: pin next file across nlm_inspect_file lock-drop\n\nnlm_traverse_files() pins the current file with f_count++ across\na mutex_unlock for nlm_inspect_file(), but nothing pins the saved\nnext pointer.  A concurrent nlm_release_file() can kfree the next\nfile during the unlock window, and the iterator dereferences freed\nmemory on the next loop step.\n\nPin both current and next before the lock-drop.  Advance by\nswapping the pinned cursors at the end of each iteration so next\nis always held alive across the unlock.\n\nAlways call nlm_file_release() after dropping the iteration pin,\nregardless of whether the file matched the predicate.  Use\nnlm_file_inuse(), which does a live walk of the inode lock list,\nrather than the cached f_locks field, so skipped files that never\nran nlm_inspect_file() are evaluated correctly.\n\nBecause every file in a hash bucket is now pinned and released,\nfiles skipped by the is_failover_file predicate that have no\nlocks, blocks, shares, or external references are deleted during\ntraversal.  The old code never evaluated skipped files for\ncleanup.  The new behavior is intentional: such files are stale\nand should not persist in the table."
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              "value": "AV:N - lockd is the in-kernel NLM RPC server on TCP/UDP, reached by remote NFSv3 clients. nlm_traverse_files() runs on NLMPROC_FREE_ALL, and nlm_release_file() runs from LOCK/UNLOCK/TEST and from rpciod NLM_GRANTED_MSG completion, so the UAF is triggered by network NLM traffic.\nAC:L - A remote NFS client can populate nlm_files via LOCK, send FREE_ALL to drop nlm_file_mutex inside nlm_traverse_files(), and concurrently complete in-flight GRANTED_MSG callbacks so rpciod\u0027s nlmsvc_grant_release() calls nlm_release_file() on the unpinned next object; the attacker drives both sides of the race.\nPR:N - lockd_authenticate() accepts RPC_AUTH_NULL and RPC_AUTH_UNIX. FREE_ALL is not a privileged-port callback, and nlm_fopen() opens files with NFSD_MAY_BYPASS_GSS|NFSD_MAY_NLM, so no host account or capability is required.\nUI:N - Exploitation uses only attacker-sent NLM RPCs (LOCK/FREE_ALL and grant-callback completion); no victim user or administrator action is required.\nS:U - The use-after-free is in the host kernel\u0027s lockd file table and impacts that same kernel; it does not cross a VM, IOMMU, or other security-authority boundary.\nC:H - The iterator dereferences a kfree\u0027d struct nlm_file (list pointers, f_file[], f_count). This UAF lets an attacker reuse the slab object and obtain a kernel read primitive, so confidentiality impact is high.\nI:H - The same nlm_file UAF is a kernel heap free of list nodes, mutex state, and struct file pointers, which can be sprayed for an arbitrary write and control-flow hijack, so integrity impact is high.\nA:H - Walking the freed nlm_file in nlm_traverse_files() causes a kernel oops/panic (KASAN slab-use-after-free), so availability impact is high."
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    "dateUpdated": "2026-09-14T12:00:21.375Z",
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Advance by\\nswapping the pinned cursors at the end of each iteration so next\\nis always held alive across the unlock.\\n\\nAlways call nlm_file_release() after dropping the iteration pin,\\nregardless of whether the file matched the predicate.  Use\\nnlm_file_inuse(), which does a live walk of the inode lock list,\\nrather than the cached f_locks field, so skipped files that never\\nran nlm_inspect_file() are evaluated correctly.\\n\\nBecause every file in a hash bucket is now pinned and released,\\nfiles skipped by the is_failover_file predicate that have no\\nlocks, blocks, shares, or external references are deleted during\\ntraversal.  The old code never evaluated skipped files for\\ncleanup.  The new behavior is intentional: such files are stale\\nand should not persist in the table.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/lockd/svcsubs.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"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\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/lockd/svcsubs.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.18\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.18\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.270\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.221\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.188\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.157\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.109\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.50\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2.4\",\"lessThanOrEqual\":\"7.2.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.3-rc1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":9.8,\"baseSeverity\":\"CRITICAL\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/08a455f87b14c7ff22ae3fdadda62a796a3a5572\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/350087f231c11efcd288c310707c40eab63ca583\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/41f0a6d31615fcae261bf28a0aa50050dc93a401\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/526c49cff3f72c3ec74752016380c7567040581b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/550c19222c7132c888e23c9d89079ba1c9bc4cca\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c24bdb7df2f34bdc38ca8a73796f5acb40f1830c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e3c413f789eaf0170275c7eba523ead73d963f30\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e999a88133654c6dfc68487fb49da5f20dfa2d4f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-09-13T06:56:14+00:00",
      "cve": "CVE-2026-89485",
      "id": "CVE-2026-89485",
      "initial_release_date": "2026-09-11T19:43:39.403000+00:00",
      "product_status:known_affected": "2",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Linux kernel: lockd use-after-free vulnerability leading to system instability",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89485.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-09-16T00:03:06Z",
      "cve": "CVE-2026-89485",
      "id": "CVE-2026-89485",
      "initial_release_date": "2026-09-12T16:27:39Z",
      "product_status:known_affected": "353",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-89485",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-89485.json",
      "version": "4"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.