{
  "cveId": "CVE-2021-4090",
  "url": "https://patchblox.com/security/cve/CVE-2021-4090",
  "summary": "CVE-2021-4090 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-4090, released February 18, 2022. It is not reported as exploited. Patch Radar priority: High.",
  "title": "linux: An out-of-bounds (OOB) memory write flaw was found in the NFSD in the Linux kernel",
  "description": "An out-of-bounds (OOB) memory write flaw was found in the NFSD in the Linux kernel. Missing sanity may lead to a write beyond bmval[bmlen-1] in nfsd4_decode_bitmap4 in fs/nfsd/nfs4xdr.c. In this flaw, a local attacker with user privilege may gain access to out-of-bounds memory, leading to a system integrity and confidentiality threat.",
  "published": "2022-02-18T18:15:10Z",
  "severity": "high",
  "cvss": 7.1,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N",
  "epss": 0.00339,
  "epssPercentile": 0.27505,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "5.15.5-1",
      "fix": "DEBIAN-CVE-2021-4090",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-4090",
      "released": "2022-02-18T18:15:10Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "5.15.5-1",
      "fix": "DEBIAN-CVE-2021-4090",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-4090",
      "released": "2022-02-18T18:15:10Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "5.15.5-1",
      "fix": "DEBIAN-CVE-2021-4090",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-4090",
      "released": "2022-02-18T18:15:10Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T19:12:23Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}