{
  "cveId": "CVE-2026-80738",
  "url": "https://patchblox.com/security/cve/CVE-2026-80738",
  "summary": "CVE-2026-80738 is fixed in linux on 1 platform, first by DEBIAN-CVE-2026-80738, released September 4, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "bpf: Check sk_state before sk_protocol in bpf_tcp_*_syncookie",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  bpf: Check sk_state before sk_protocol in bpf_tcp_*_syncookie  bpf_tcp_gen_syncookie and bpf_tcp_check_syncookie accept a socket pointer \u0027sk\u0027 with argument type ARG_PTR_TO_BTF_ID_SOCK_COMMON. However, they access sk-\u003Esk_protocol without validating whether \u0027sk\u0027 represents a full socket.  Fix this issue by checking sk-\u003Esk_state != TCP_LISTEN before inspecting sk-\u003Esk_protocol in both bpf_tcp_gen_syncookie and bpf_tcp_check_syncookie. Since mini-sockets are never in the TCP_LISTEN state, the condition short-circuits and prevents dereferencing fullsock-specific fields.",
  "published": "2026-09-03T13:06:12Z",
  "severity": "Moderate",
  "cvss": 7.3,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L",
  "epss": 0.00171,
  "epssPercentile": 0.06551,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-80738",
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.12.115-2",
      "fix": "DEBIAN-CVE-2026-80738",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-80738",
      "released": "2026-09-04T01:46:23Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.1.9-1",
      "fix": "DEBIAN-CVE-2026-80738",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-80738",
      "released": "2026-09-04T01:46:23Z"
    }
  ],
  "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"
  }
}