{
  "cveId": "CVE-2021-4159",
  "url": "https://patchblox.com/security/cve/CVE-2021-4159",
  "summary": "CVE-2021-4159 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-4159, released August 24, 2022. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: A vulnerability was found in the Linux kernel\u0027s EBPF verifier when handling internal data structures",
  "description": "A vulnerability was found in the Linux kernel\u0027s EBPF verifier when handling internal data structures. Internal memory locations could be returned to userspace. A local attacker with the permissions to insert eBPF code to the kernel can use this to leak internal kernel memory details defeating some of the exploit mitigations in place for the kernel.",
  "published": "2022-08-24T16:15:09Z",
  "severity": "medium",
  "cvss": 4.4,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N",
  "epss": 0.00248,
  "epssPercentile": 0.16252,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "5.7.6-1",
      "fix": "DEBIAN-CVE-2021-4159",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-4159",
      "released": "2022-08-24T16:15:09Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "5.7.6-1",
      "fix": "DEBIAN-CVE-2021-4159",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-4159",
      "released": "2022-08-24T16:15:09Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "5.7.6-1",
      "fix": "DEBIAN-CVE-2021-4159",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-4159",
      "released": "2022-08-24T16:15:09Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T06:59:42Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}