PT-2026-32750 · Microsoft · Windows Ancillary Function Driver For Winsock+1

Angelboy · Published 2026-04-14 · Updated 2026-04-15 · CVE-2026-26173

Positive Technologies (AI Summary)

CVSS v3.1

7.0

High

Base vector

AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions Windows Ancillary Function Driver for WinSock (affected versions not specified)

Description A race condition occurs due to improper synchronization when using a shared resource. This allows an authorized attacker to elevate privileges locally on the system.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Use After Free

NULL Pointer Dereference

Race Condition

Weakness Enumeration

CWE-416

CWE-476

CWE-362

Related Identifiers

BDU:2026-05305

CVE-2026-26173

Affected Products

Windows

Windows Ancillary Function Driver For Winsock

References · 6

• https://nvd.nist.gov/vuln/detail/CVE-2026-26173 · Security Note
• https://bdu.fstec.ru/vul/2026-05305 · Security Note
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-26173 · Security Note
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26173 · Vendor Advisory
• https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2026-26173 · Vendor Advisory
• https://twitter.com/CVEnew/status/2044358616107381193 · Twitter Post