CVE-2026-83738 Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability

{
  "id": "1a4eef70e7a14356f176e9d75481237a1a6b9ef31accb0cb12a82f4ee2cb442c",
  "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83738",
  "method": "llm",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2026-83738 Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability",
    "summary": "An authorized attacker could exploit a use-after-free vulnerability in the Windows Ancillary Function Driver for WinSock to elevate privileges locally.",
    "evidence": "Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.",
    "products": [
      {
        "name": {
          "value": "Windows Ancillary Function Driver for WinSock",
          "evidence": "CVE-2026-83738 Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "fixed_cves": [],
    "related_cves": [
      {
        "value": "CVE-2026-83738",
        "evidence": "CVE-2026-83738 Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "official-microsoft-security-updates",
  "document_id": 24973,
  "published_at": "2026-10-13T14:00:00+00:00"
}