Microsoft Windows Ancillary Function Driver for WinSock Privilege Escalation Vulnerability

A vulnerability allowing local privilege escalation has been identified in the Windows Ancillary Function Driver for WinSock. This issue arises from improper validation of certain input types, which could be exploited by an authorized attacker to gain elevated privileges.

Impact

Exploitation of this vulnerability could allow an attacker to gain SYSTEM privileges.

Remediation

Users can apply the security update for this vulnerability, which is included in the March 2026 Windows Update. Instructions for downloading this update are available on the Microsoft Update Catalog.