CVE-2026-89484 (GCVE-0-2026-89484)
Vulnerability from cvelistv5
Published
2026-09-11 19:43
Modified
2026-10-21 12:47
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: lockd: fix NULL dereference on lockowner allocation failure nlmclnt_locks_init_private() installs NLM file lock operations even when nlmclnt_find_lockowner() fails to allocate a lockowner. nlmclnt_proc() then returns -ENOMEM, but the VFS still tears down the partially initialized file_lock and calls locks_release_private(). That invokes nlmclnt_locks_release_private(), which dereferences fl->fl_u.nfs_fl.owner and crashes because the owner was never installed. Clear fl_ops before attempting to initialize the NLM private state, and install the NLM lock operations only after a lockowner has been allocated successfully.
References
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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{
  "containers": {
    "cna": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/lockd/clntproc.c"
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          "programFiles": [
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          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.12"
            },
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              "version": "0",
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              "versionType": "semver"
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              "status": "unaffected",
              "version": "7.2.4",
              "versionType": "semver"
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              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.160",
                  "versionStartIncluding": "2.6.12",
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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: fix NULL dereference on lockowner allocation failure\n\nnlmclnt_locks_init_private() installs NLM file lock operations even when\nnlmclnt_find_lockowner() fails to allocate a lockowner. nlmclnt_proc()\nthen returns -ENOMEM, but the VFS still tears down the partially\ninitialized file_lock and calls locks_release_private().\n\nThat invokes nlmclnt_locks_release_private(), which dereferences\nfl-\u003efl_u.nfs_fl.owner and crashes because the owner was never installed.\n\nClear fl_ops before attempting to initialize the NLM private state, and\ninstall the NLM lock operations only after a lockowner has been allocated\nsuccessfully."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-21T12:47:36.031Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/6db5af172ccc3223c8f730a9a4212f6427feee3e"
        },
        {
          "url": "https://git.kernel.org/stable/c/07adfbb3de7529f58ca708a97ead7fa4fdb71056"
        },
        {
          "url": "https://git.kernel.org/stable/c/d662f7fc04fde305a27f304b3cd19b614d366839"
        },
        {
          "url": "https://git.kernel.org/stable/c/51af080ca4e553256c59a75a877b9b4fff828311"
        },
        {
          "url": "https://git.kernel.org/stable/c/4c7fc129db061c7daab841c4f3c342d894832362"
        }
      ],
      "title": "lockd: fix NULL dereference on lockowner allocation failure",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89484",
    "datePublished": "2026-09-11T19:43:38.740Z",
    "dateReserved": "2026-09-11T19:38:34.712Z",
    "dateUpdated": "2026-10-21T12:47:36.031Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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