HarborGuard / CVE
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HIGHCVE-2026-21241Published Modified CNA microsoft

CVE-2026-21241: 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.

Metrics

CVSS v3.1
7.0
Severity
HIGH
Fixed in
10.0.20348.4773
Affected Products
10

Fix available

10.0.20348.477310.0.22631.664910.0.25398.214910.0.26100.784010.0.26100.3237010.0.26200.784010.0.28000.1575
Patch commits
Affected packages
  • Microsoft / Windows 11 version 22H3
    < 10.0.22631.6649 (from 10.0.22631.0)
  • Microsoft / Windows 11 Version 23H2
    < 10.0.22631.6649 (from 10.0.22631.0)
  • Microsoft / Windows 11 Version 24H2
    < 10.0.26100.7840 (from 10.0.26100.0)
  • Microsoft / Windows 11 Version 25H2
    < 10.0.26200.7840 (from 10.0.26200.0)
  • Microsoft / Windows 11 version 26H1
    < 10.0.28000.1575 (from 10.0.28000.0)
  • Microsoft / Windows 11 Version 26H1
    < 10.0.28000.1575 (from 10.0.28000.0)
  • Microsoft / Windows Server 2022
    < 10.0.20348.4773 (from 10.0.20348.0)
  • Microsoft / Windows Server 2022, 23H2 Edition (Server Core installation)
    < 10.0.25398.2149 (from 10.0.25398.0)
  • Microsoft / Windows Server 2025
    < 10.0.26100.32370 (from 10.0.26100.0)
  • Microsoft / Windows Server 2025 (Server Core installation)
    < 10.0.26100.32370 (from 10.0.26100.0)
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
References