CyberICT

CVE-2026-21241

Microsoft · Published February 10, 2026

CVSS v3.1

HIGH
Patch availableGet patch

Description

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

Affected Products

  • 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)

CVSS Vector

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C