PT-2026-40146 · Microsoft · Win32K+1

Published 2026-05-12 · Updated 2026-05-15 · CVE-2026-33839

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 Win32K - GRFX (affected versions not specified)

Description A race condition occurs in Windows Win32K - GRFX due to improper synchronization when using a shared resource. This allows an authorized attacker to elevate privileges locally 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:2026-06602

CVE-2026-33839

Affected Products

Win32K

Windows

References · 8

• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-33839 · Security Note
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33839 · Vendor Advisory
• https://bdu.fstec.ru/vul/2026-06602 · Security Note
• https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2026-33839 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-33839 · Security Note
• https://twitter.com/f1tym1/status/2055171272481411535 · Twitter Post
• https://twitter.com/windowsforum/status/2054258684079808802 · Twitter Post
• https://feedly.com/cve/CVE-2026-33839 · Note