CVE-2026-21241HighCVSS 7.0

Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability

Published
February 10, 2026
Last Modified
—

🔗 CVE IDs covered (1)

CVE-2026-21241 →

📋 Description

Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

🎯 Affected products13

  • Windows 11 Version 23H2 for ARM64-based Systems
  • Windows 11 Version 23H2 for x64-based Systems
  • Windows 11 Version 24H2 for ARM64-based Systems
  • Windows 11 Version 24H2 for x64-based Systems
  • Windows 11 Version 25H2 for ARM64-based Systems
  • Windows 11 Version 25H2 for x64-based Systems
  • Windows 11 Version 26H1 for ARM64-based Systems
  • Windows 11 version 26H1 for x64-based Systems
  • Windows Server 2022
  • Windows Server 2022 (Server Core installation)
  • Windows Server 2022, 23H2 Edition (Server Core installation)
  • Windows Server 2025
  • Windows Server 2025 (Server Core installation)

✅ Remediation

KB5077179 (Security Update) — fixed build 10.0.28000.1575 KB5075906 (Security Update) — fixed build 10.0.20348.4773 KB5075943 (Security Hotpatch Update) — fixed build 10.0.20348.4711 KB5075899 (Security Update) — fixed build 10.0.26100.32370 KB5075942 (Security Hotpatch Update) — fixed build 10.0.26100.32313 KB5077181 (Security Update) — fixed build 10.0.26200.7840 KB5077212 (Security Hotpatch Update) — fixed build 10.0.26200.7781 KB5075941 (Security Update) — fixed build 10.0.22631.6649 KB5075897 (Security Update) — fixed build 10.0.25398.2149 KB5077181 (Security Update) — fixed build 10.0.26100.7840 KB5077212 (Security Hotpatch Update) — fixed build 10.0.26100.7781

🔗 References (19)