MICROSOFT-CVE-2026-34345

HIGH7.0

Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability

Published May 12, 2026

Modified 4 days ago

Details

Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

References

ADVISORY

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-34345

CVSS Analysis

CVSS v2.0

7.0

Upstream

CVE-2026-34345

Ecosystems

Timeline

PublishedMay 12, 2026

ModifiedMay 18, 2026