Description
Null pointer dereference in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Microsoft | Windows 10 Version 21H2 | 10.0.19044.0 – < 10.0.19044.7058 | 10.0.19044.7058 |
| Microsoft | Windows 10 Version 22H2 | 10.0.19045.0 – < 10.0.19045.7058 | 10.0.19045.7058 |
| Microsoft | Windows 11 version 23H2 | 10.0.22631.0 – < 10.0.22631.6783 | 10.0.22631.6783 |
| Microsoft | Windows 11 Version 24H2 | 10.0.26100.0 – < 10.0.26100.8037 | 10.0.26100.8037 |
| Microsoft | Windows 11 Version 25H2 | 10.0.26200.0 – < 10.0.26200.8037 | 10.0.26200.8037 |
| Microsoft | Windows 11 version 26H1 | 10.0.28000.0 – < 10.0.28000.1719 | 10.0.28000.1719 |
| Microsoft | Windows Server 2022 | 10.0.20348.0 – < 10.0.20348.4893 | 10.0.20348.4893 |
| Microsoft | Windows Server 2022, 23H2 Edition (Server Core installation) | 10.0.25398.0 – < 10.0.25398.2207 | 10.0.25398.2207 |
| Microsoft | Windows Server 2025 | 10.0.26100.0 – < 10.0.26100.32522 | 10.0.26100.32522 |
| Microsoft | Windows Server 2025 (Server Core installation) | 10.0.26100.0 – < 10.0.26100.32522 | 10.0.26100.32522 |
Advisories 3
- WID-SEC-2026-0661 Microsoft Windows und Windows Server: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jul 5, 2026
- MSRC-CVE-2026-24293 Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability Microsoft Security Response Center · May 29, 2026
- NCSC-2026-0080 Kwetsbaarheden verholpen in Microsoft Windows NCSC-NL (Netherlands) · Mar 10, 2026
References
- Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability vendor-advisory patch