{
  "cveId": "CVE-2025-71090",
  "url": "https://patchblox.com/security/cve/CVE-2025-71090",
  "summary": "CVE-2025-71090 is fixed in linux on 1 platform by DEBIAN-CVE-2025-71090 (version 6.18.5-1), released January 13, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  nfsd: fix nfsd_file reference leak in nfsd4_add_...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  nfsd: fix nfsd_file reference leak in nfsd4_add_rdaccess_to_wrdeleg()  nfsd4_add_rdaccess_to_wrdeleg() unconditionally overwrites fp-\u003Efi_fds[O_RDONLY] with a newly acquired nfsd_file. However, if the client already has a SHARE_ACCESS_READ open from a previous OPEN operation, this action overwrites the existing pointer without releasing its reference, orphaning the previous reference.  Additionally, the function originally stored the same nfsd_file pointer in both fp-\u003Efi_fds[O_RDONLY] and fp-\u003Efi_rdeleg_file with only a single reference. When put_deleg_file() runs, it clears fi_rdeleg_file and calls nfs4_file_put_access() to release the file.  However, nfs4_file_put_access() only releases fi_fds[O_RDONLY] when the fi_access[O_RDONLY] counter drops to zero. If another READ open exists on the file, the counter remains elevated and the nfsd_file reference from the delegation is never released. This potentially causes open conflicts on that file.  Then, on server shutdown, these leaks cause __nfsd_file_cache_purge() to encounter files with an elevated reference count that cannot be cleaned up, ultimately triggering a BUG() in kmem_cache_destroy() because there are still nfsd_file objects allocated in that cache.",
  "published": "2026-01-13T16:16:08Z",
  "severity": "medium",
  "cvss": 5.5,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00217,
  "epssPercentile": 0.12236,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "6.18.5-1",
      "fix": "DEBIAN-CVE-2025-71090",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2025-71090",
      "released": "2026-01-13T16:16:08Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-07T18:46:35Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}