Skip to content
CVE PROGRAM SOURCE RECORD7.8 High

CVE-2026-21238

Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability

Read JSON ↗CVE.org ↗
Status
Published
Published
Updated
Assigning organization
microsoft

Description

Improper access control in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Microsoft Windows 10 Version 1607

  • 10.0.14393.0 to < 10.0.14393.8868affected

Microsoft Windows 10 Version 1809

  • 10.0.17763.0 to < 10.0.17763.8389affected

Microsoft Windows 10 Version 21H2

  • 10.0.19044.0 to < 10.0.19044.6937affected

Microsoft Windows 10 Version 22H2

  • 10.0.19045.0 to < 10.0.19045.6937affected

Microsoft Windows 11 version 22H3

  • 10.0.22631.0 to < 10.0.22631.6649affected

Microsoft Windows 11 Version 23H2

  • 10.0.22631.0 to < 10.0.22631.6649affected

Microsoft Windows 11 Version 24H2

  • 10.0.26100.0 to < 10.0.26100.7840affected

Microsoft Windows 11 Version 25H2

  • 10.0.26200.0 to < 10.0.26200.7840affected

Microsoft Windows 11 version 26H1

  • 10.0.28000.0 to < 10.0.28000.1575affected

Microsoft Windows 11 Version 26H1

  • 10.0.28000.0 to < 10.0.28000.1575affected

Microsoft Windows Server 2012

  • 6.2.9200.0 to < 6.2.9200.25923affected

Microsoft Windows Server 2012 (Server Core installation)

  • 6.2.9200.0 to < 6.2.9200.25923affected

Microsoft Windows Server 2012 R2

  • 6.3.9600.0 to < 6.3.9600.23022affected

Microsoft Windows Server 2012 R2 (Server Core installation)

  • 6.3.9600.0 to < 6.3.9600.23022affected

Microsoft Windows Server 2016

  • 10.0.14393.0 to < 10.0.14393.8868affected

Microsoft Windows Server 2016 (Server Core installation)

  • 10.0.14393.0 to < 10.0.14393.8868affected

Microsoft Windows Server 2019

  • 10.0.17763.0 to < 10.0.17763.8389affected

Microsoft Windows Server 2019 (Server Core installation)

  • 10.0.17763.0 to < 10.0.17763.8389affected

Microsoft Windows Server 2022

  • 10.0.20348.0 to < 10.0.20348.4773affected

Microsoft Windows Server 2022, 23H2 Edition (Server Core installation)

  • 10.0.25398.0 to < 10.0.25398.2149affected

Microsoft Windows Server 2025

  • 10.0.26100.0 to < 10.0.26100.32370affected

Microsoft Windows Server 2025 (Server Core installation)

  • 10.0.26100.0 to < 10.0.26100.32370affected

References