CVE-2026-41088: Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability

Published May 12, 2026
·
Updated

Access of resource using incompatible type ('type confusion') in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

Other sources

Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability

— Microsoft

Affected Software

37 affected componentsFixes available
Microsoft Windows Ancillary Function Driver for WinSock
Microsoft Windows 11=26H1
Patch available
Microsoft Windows 11=26H1
Patch available
Microsoft Windows 11=24H2
Patch availablePatch available
Microsoft Windows Server 2022, 23H2 Edition
Patch available
Microsoft Windows Server 2025
Patch availablePatch available
Microsoft Windows 11=23H2
Patch available
Microsoft Windows 11=24H2
Patch availablePatch available
Microsoft Windows 11=25H2
Patch availablePatch available
Microsoft Windows 11=25H2
Patch availablePatch available
Microsoft Windows Server 2025
Patch availablePatch available
Microsoft Windows 10=21H2
Patch available
Microsoft Windows Server 2022
Patch availablePatch available
Microsoft Windows 10=21H2
Patch available
Microsoft Windows 10=21H2
Patch available
Microsoft Windows Server 2022
Patch availablePatch available
Microsoft Windows 10 21h2<10.0.19044.7291
Microsoft Windows 10 21h2<10.0.19044.7291
Microsoft Windows 10 21h2<10.0.19044.7291
Microsoft Windows 10 22h2<10.0.19045.7291
Microsoft Windows 10 22h2<10.0.19045.7291
Microsoft Windows 10 22h2<10.0.19045.7291
Microsoft Windows 11 23h2<10.0.22631.7079
Microsoft Windows 11 23h2<10.0.22631.7079
Microsoft Windows 11 24h2<10.0.26100.8390
Microsoft Windows 11 24h2<10.0.26100.8390
Microsoft Windows 11 25h2<10.0.26200.8390
Microsoft Windows 11 25h2<10.0.26200.8390
Microsoft Windows 11 26h1<10.0.28000.2113
Microsoft Windows 11 26h1<10.0.28000.2113
Microsoft Windows Server 2022<10.0.20348.5074
Microsoft Windows Server 2022 23h2<10.0.25398.2330
Microsoft Windows Server 2025<10.0.26100.32772
Microsoft Windows 11=23H2
Patch available
Microsoft Windows 10=22H2
Patch available
Microsoft Windows 10=22H2
Patch available
Microsoft Windows 10=22H2
Patch available

Event History

May 12, 2026
CVE Published
via Microsoft·02:00 PM
Data Sourced
via Microsoft·02:00 PM
DescriptionSeverityWeaknessAffected Software
Updated
via Microsoft·02:00 PM
Affected Software
Updated
via Microsoft·02:00 PM
Description
CVE Published
via MITRE·04:58 PM
Data Sourced
via MITRE·04:58 PM
DescriptionSeverity
Data Sourced
via NVD·06:17 PM
DescriptionSeverityWeaknessAffected Software
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