{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-89485",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-89485"
  ],
  "published": "2026-09-11T19:47:07Z",
  "summary": "lockd: pin next file across nlm_inspect_file lock-drop",
  "details": "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.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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          "1:6.18.29-1+rpt1": {
            "linux_commit": "66318c5b5cd8145a662303af12ed39ac07eb27cc",
            "upstream_version": "6.18.29",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.50"
          },
          "1:6.18.33-1+rpt1": {
            "linux_commit": "95b85bebbedcaedfa7ca79116ed38b7376fba412",
            "upstream_version": "6.18.33",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.50"
          },
          "1:6.18.34-1+rpt1": {
            "linux_commit": "c8c7494100e99ee05b11aaa4f0588a223a63d1af",
            "upstream_version": "6.18.34",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.50"
          },
          "1:6.18.39-1+rpt1": {
            "linux_commit": "60ea684a8ace97bb0db1a16e20753bdd6ab371ff",
            "upstream_version": "6.18.39",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.50"
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-89485"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e3c413f789eaf0170275c7eba523ead73d963f30"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/08a455f87b14c7ff22ae3fdadda62a796a3a5572"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/550c19222c7132c888e23c9d89079ba1c9bc4cca"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/350087f231c11efcd288c310707c40eab63ca583"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c24bdb7df2f34bdc38ca8a73796f5acb40f1830c"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/41f0a6d31615fcae261bf28a0aa50050dc93a401"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e999a88133654c6dfc68487fb49da5f20dfa2d4f"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/526c49cff3f72c3ec74752016380c7567040581b"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-09-14T12:06:03Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 9.8,
      "cvss_v3_severity": "Critical",
      "scenario": "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's 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's 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'd 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."
    }
  }
}