Description
Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Microsoft | Windows 11 version 22H3 | 10.0.22631.0 – < 10.0.22631.6649 | 10.0.22631.6649 |
| Microsoft | Windows 11 Version 23H2 | 10.0.22631.0 – < 10.0.22631.6649 | 10.0.22631.6649 |
| Microsoft | Windows 11 Version 24H2 | 10.0.26100.0 – < 10.0.26100.7840 | 10.0.26100.7840 |
| Microsoft | Windows 11 Version 25H2 | 10.0.26200.0 – < 10.0.26200.7840 | 10.0.26200.7840 |
| Microsoft | Windows 11 version 26H1 | 10.0.28000.0 – < 10.0.28000.1575 | 10.0.28000.1575 |
| Microsoft | Windows Server 2022 | 10.0.20348.0 – < 10.0.20348.4773 | 10.0.20348.4773 |
| Microsoft | Windows Server 2022, 23H2 Edition (Server Core installation) | 10.0.25398.0 – < 10.0.25398.2149 | 10.0.25398.2149 |
| Microsoft | Windows Server 2025 | 10.0.26100.0 – < 10.0.26100.32370 | 10.0.26100.32370 |
| Microsoft | Windows Server 2025 (Server Core installation) | 10.0.26100.0 – < 10.0.26100.32370 | 10.0.26100.32370 |
Advisories 3
- WID-SEC-2026-0369 Microsoft Windows: Mehrere Schwachstellen BSI CERT-Bund (WID) · Mar 26, 2026
- NCSC-2026-0053 Kwetsbaarheden verholpen in Microsoft Windows NCSC-NL (Netherlands) · Feb 10, 2026
- MSRC-CVE-2026-21241 Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability Microsoft Security Response Center · Feb 10, 2026
References
- Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability vendor-advisory patch