CVE-2026-85943 Reliable Multicast Transport Driver (RMCAST) Elevation of Privilege Vulnerability

{
  "id": "7fa7e6c0c8328ddc39a9e81e61713f5027fc969ea801ab95dd585274ab3c03b4",
  "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85943",
  "method": "llm",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2026-85943 Reliable Multicast Transport Driver (RMCAST) Elevation of Privilege Vulnerability",
    "summary": "A TOCTOU race condition in RMCAST may allow an authorized attacker to elevate privileges locally.",
    "evidence": "Time-of-check time-of-use (toctou) race condition in Reliable Multicast Transport Driver (RMCAST) allows an authorized attacker to elevate privileges locally.",
    "products": [
      {
        "name": {
          "value": "Reliable Multicast Transport Driver (RMCAST)",
          "evidence": "Reliable Multicast Transport Driver (RMCAST)"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "fixed_cves": [],
    "related_cves": [
      {
        "value": "CVE-2026-85943",
        "evidence": "CVE-2026-85943 Reliable Multicast Transport Driver (RMCAST) Elevation of Privilege Vulnerability"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "official-microsoft-security-updates",
  "document_id": 25622,
  "published_at": "2026-10-13T14:00:00+00:00"
}