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Unrated severityNVD Advisory· Published Feb 10, 2026· Updated Apr 10, 2026

Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability

CVE-2026-21241

Description

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

Affected products

10
  • Windows/Ancillary Function Driver for WinSockllm-fuzzy
  • Microsoft/Windows 11 version 22H3v5
    Range: 10.0.22631.0
  • Microsoft/Windows 11 Version 23H2v5
    Range: 10.0.22631.0
  • Microsoft/Windows 11 Version 24H2v5
    Range: 10.0.26100.0
  • Microsoft/Windows 11 Version 25H2v5
    Range: 10.0.26200.0
  • Microsoft/Windows 11 Version 26H1v5
    Range: 10.0.28000.0
  • Microsoft/Windows Server 2022v5
    Range: 10.0.20348.0
  • Microsoft/Windows Server 2022, 23H2 Edition (Server Core installation)v5
    Range: 10.0.25398.0
  • Microsoft/Windows Server 2025v5
    Range: 10.0.26100.0
  • Microsoft/Windows Server 2025 (Server Core installation)v5
    Range: 10.0.26100.0

Patches

0

No patches discovered yet.

Vulnerability mechanics

AI mechanics synthesis has not run for this CVE yet.

References

1

News mentions

0

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