CVE-2026-21241 Details

A use-after-free vulnerability has been identified in the Windows Ancillary Function Driver for WinSock. This vulnerability allows an authorized attacker to locally elevate privileges. The issue arises from improper memory management, which could be exploited to gain higher-level permissions.

Users can apply the security update provided by Microsoft to address this vulnerability. This security update is available through the Microsoft Update Catalog. Specific update details can be found in the Microsoft Knowledge Base articles KB5075899, KB5075942, KB5077181, KB5077212, KB5075906, KB5075943, and KB5077179.