{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "3de744ee4e4557da0d63be8a97ad44b4dad58912"
            },
            {
              "fixed": "686c2434f9f16b87aeed18d76cc562df9f2695ab"
            },
            {
              "fixed": "6e4c62caecf792e8a15ad9bc7f371e57c17e3302"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "7.1.0"
            },
            {
              "fixed": "7.1.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74315.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nlockd: Avoid hashing uninitialized bytes in nlm4svc_lookup_file()\n\nfile_hash() digests the first LOCKD_FH_HASH_SIZE bytes of\nnfs_fh.data when bucketing nlm_files[], independent of fh.size.\nCommit 3de744ee4e45 (\"lockd: Use xdrgen XDR functions for the\nNLMv4 TEST procedure\") set .pc_argzero to zero for the converted\nprocedures and moved file-handle population into\nnlm4svc_lookup_file(), which copies only xdr_lock-\u003efh.len bytes\ninto lock-\u003efh.data.\n\nWhen an NLMv4 client presents a file handle shorter than\nLOCKD_FH_HASH_SIZE, bytes fh.len..31 retain whatever the argument\nbuffer held from an earlier request.  The same wire handle then\nhashes to different buckets across calls; nlm_lookup_file() misses\nthe existing nlm_file entry, and lock-state lookups fail.\n\nZero only the tail bytes that file_hash() would otherwise consume.\nHandles of LOCKD_FH_HASH_SIZE or larger already populate every byte\nthat file_hash() reads.",
  "id": "CVE-2026-74315",
  "modified": "2026-08-16T03:31:32.581008894Z",
  "published": "2026-08-15T05:58:13.504Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/686c2434f9f16b87aeed18d76cc562df9f2695ab"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6e4c62caecf792e8a15ad9bc7f371e57c17e3302"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74315.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74315"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "lockd: Avoid hashing uninitialized bytes in nlm4svc_lookup_file()"
}