PT-2026-40177 · Microsoft · Windows Ancillary Function Driver For Winsock+1

Published 2026-05-12 · Updated 2026-05-12 · CVE-2026-35416

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 use after free issue in the Windows Ancillary Function Driver for WinSock (AFD.sys) allows an authorized attacker to elevate privileges locally. A use after free occurs when a program continues to use a pointer after it has been freed, which can lead to memory corruption or arbitrary code execution.

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

Use After Free

Weakness Enumeration

CWE-416

Related Identifiers

BDU:2026-06608

CVE-2026-35416

Affected Products

Windows

Windows Ancillary Function Driver For Winsock

References · 7

• https://nvd.nist.gov/vuln/detail/CVE-2026-35416 · Security Note
• https://bdu.fstec.ru/vul/2026-06608 · Security Note
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-35416 · Security Note
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-35416 · Vendor Advisory
• https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2026-35416 · Vendor Advisory
• https://feedly.com/cve/CVE-2026-35416 · Note
• https://twitter.com/windowsforum/status/2054270540337037550 · Twitter Post