CVE-2026-21238 — Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability

Description (CNA)

No English CNA description was supplied.

Affected (CNA)

Vendor / product	Versions
Microsoft / Windows 10 Version 1607	affected 10.0.14393.0 before 10.0.14393.8868
Microsoft / Windows 10 Version 1809	affected 10.0.17763.0 before 10.0.17763.8389
Microsoft / Windows 10 Version 21H2	affected 10.0.19044.0 before 10.0.19044.6937
Microsoft / Windows 10 Version 22H2	affected 10.0.19045.0 before 10.0.19045.6937
Microsoft / Windows 11 version 22H3	affected 10.0.22631.0 before 10.0.22631.6649
Microsoft / Windows 11 Version 23H2	affected 10.0.22631.0 before 10.0.22631.6649
Microsoft / Windows 11 Version 24H2	affected 10.0.26100.0 before 10.0.26100.7840
Microsoft / Windows 11 Version 25H2	affected 10.0.26200.0 before 10.0.26200.7840
Microsoft / Windows 11 version 26H1	affected 10.0.28000.0 before 10.0.28000.1575
Microsoft / Windows 11 Version 26H1	affected 10.0.28000.0 before 10.0.28000.1575
Microsoft / Windows Server 2012	affected 6.2.9200.0 before 6.2.9200.25923
Microsoft / Windows Server 2012 (Server Core installation)	affected 6.2.9200.0 before 6.2.9200.25923
Microsoft / Windows Server 2012 R2	affected 6.3.9600.0 before 6.3.9600.23022
Microsoft / Windows Server 2012 R2 (Server Core installation)	affected 6.3.9600.0 before 6.3.9600.23022
Microsoft / Windows Server 2016	affected 10.0.14393.0 before 10.0.14393.8868
Microsoft / Windows Server 2016 (Server Core installation)	affected 10.0.14393.0 before 10.0.14393.8868
Microsoft / Windows Server 2019	affected 10.0.17763.0 before 10.0.17763.8389
Microsoft / Windows Server 2019 (Server Core installation)	affected 10.0.17763.0 before 10.0.17763.8389
Microsoft / Windows Server 2022	affected 10.0.20348.0 before 10.0.20348.4773
Microsoft / Windows Server 2022, 23H2 Edition (Server Core installation)	affected 10.0.25398.0 before 10.0.25398.2149
Microsoft / Windows Server 2025	affected 10.0.26100.0 before 10.0.26100.32370
Microsoft / Windows Server 2025 (Server Core installation)	affected 10.0.26100.0 before 10.0.26100.32370

CWE

CWE-284

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21238

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.