Microsoft · Windows Ancillary Function Driver For Winsock · CVE-2026-20831
**Name of the Vulnerable Software and Affected Versions**
Windows Ancillary Function Driver for WinSock (affected versions not specified)
**Description**
A time-of-check time-of-use (TOCTOU) race condition exists in the Windows Ancillary Function Driver for WinSock. This condition allows a locally authorized attacker to elevate privileges. The issue arises from a timing window where a check is performed, and the state changes before the operation is carried out, potentially leading to unintended consequences.
**Recommendations**
At the moment, there is no information about a newer version that contains a fix for this vulnerability.