CVE-2026-21241
published 2026-02-10CVE-2026-21241: Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
high7CVSS 3.1
AVLACHPRLUINSUCHIHAH
Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
Affected
24 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| microsoft | windows_11_23h2 | < 10.0.22631.6649 | 10.0.22631.6649 |
| microsoft | windows_11_24h2 | < 10.0.26100.7781 | 10.0.26100.7781 |
| microsoft | windows_11_25h2 | < 10.0.26200.7781 | 10.0.26200.7781 |
| 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 | < 10.0.20348.4711 | 10.0.20348.4711 |
| microsoft | windows_server_2022 | >= 10.0.20348.0 < 10.0.20348.4773 | 10.0.20348.4773 |
| microsoft | windows_server_2022_23h2 | < 10.0.25398.2149 | 10.0.25398.2149 |
| microsoft | windows_server_2025 | < 10.0.26100.32313 | 10.0.26100.32313 |
| microsoft | windows_server_2025 | >= 10.0.26100.0 < 10.0.26100.32370 | 10.0.26100.32370 |
| msrc | windows_11_version_23h2_for_arm64-based_systems | — | — |
| msrc | windows_11_version_23h2_for_x64-based_systems | — | — |
| msrc | windows_11_version_24h2_for_arm64-based_systems | — | — |
| msrc | windows_11_version_24h2_for_x64-based_systems | — | — |
| msrc | windows_11_version_25h2_for_arm64-based_systems | — | — |
| msrc | windows_11_version_25h2_for_x64-based_systems | — | — |
| msrc | windows_11_version_26h1_for_arm64-based_systems | — | — |
| msrc | windows_11_version_26h1_for_x64-based_systems | — | — |
| msrc | windows_server_2022 | — | — |
| msrc | windows_server_2022_23h2_edition | — | — |
| msrc | windows_server_2025 | — | — |