PT-2026-40167 · Microsoft · Windows Tcp/Ip+1

Published 2026-05-12 · Updated 2026-05-12 · CVE-2026-34351

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Windows TCP/IP (affected versions not specified)

Description A race condition occurs in Windows TCP/IP due to improper synchronization when using a shared resource. This allows an authorized local attacker to elevate their privileges to SYSTEM level. A race condition is a situation where the system's substantive behavior is dependent on the sequence or timing of other uncontrollable events.

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

Race Condition

Weakness Enumeration

CWE-362

Related Identifiers

BDU:2026-06732

CVE-2026-34351

Affected Products

Windows

Windows Tcp/Ip

References · 6

• https://bdu.fstec.ru/vul/2026-06732 · Security Note
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-34351 · Vendor Advisory
• https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2026-34351 · Vendor Advisory
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-34351 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-34351 · Security Note
• https://twitter.com/windowsforum/status/2054269832602829173 · Twitter Post