CVE-2026-83636 Windows Hyper-V Denial of Service Vulnerability

{
  "id": "b866d19b3f8a9566349a8950ff2bcce8cd42d684122e4efb7b1301dea6eeb41e",
  "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83636",
  "method": "llm",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2026-83636 Windows Hyper-V Denial of Service Vulnerability",
    "summary": "An authorized attacker can cause a local denial of service through a null pointer dereference in Windows Hyper-V.",
    "evidence": "Null pointer dereference in Windows Hyper-V allows an authorized attacker to deny service locally.",
    "products": [
      {
        "name": {
          "value": "Windows Hyper-V",
          "evidence": "Null pointer dereference in Windows Hyper-V"
        },
        "prerequisites": [
          {
            "value": "an authorized attacker",
            "evidence": "allows an authorized attacker to deny service locally"
          },
          {
            "value": "locally",
            "evidence": "to deny service locally"
          }
        ],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "fixed_cves": [],
    "related_cves": [
      {
        "value": "CVE-2026-83636",
        "evidence": "CVE-2026-83636 Windows Hyper-V Denial of Service Vulnerability"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "official-microsoft-security-updates",
  "document_id": 25481,
  "published_at": "2026-10-13T14:00:00+00:00"
}