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7.0
Windows Ancillary Function Driver for WinSock Allows Privilege Escalation
CVE-2026-26173
Summary
An issue in the Windows Ancillary Function Driver for WinSock could allow a malicious user to gain more access to a Windows system than they should. This is a security concern because it could be exploited by a user who already has some level of access to the system. To protect your system, apply the latest security updates from Microsoft.
Original title
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges loca...
Original description
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.
nvd CVSS3.1
7.0
Vulnerability type
CWE-362
Race Condition
CWE-416
Use After Free
CWE-476
NULL Pointer Dereference
Published: 14 Apr 2026 · Updated: 15 Apr 2026 · First seen: 14 Apr 2026