PT-2026-40150 · Microsoft · Win32K+1

Published 2026-05-12 · Updated 2026-05-15 · CVE-2026-34330

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 Win32K - GRFX (affected versions not specified)

Description An integer overflow or wraparound in Windows Win32K - GRFX allows an authorized attacker to elevate privileges locally to SYSTEM level.

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

Integer Overflow

Use After Free

Weakness Enumeration

CWE-190

CWE-416

Related Identifiers

BDU:2026-06601

CVE-2026-34330

Affected Products

Win32K

Windows

References · 7

• https://bdu.fstec.ru/vul/2026-06601 · Security Note
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-34330 · Vendor Advisory
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-34330 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-34330 · Security Note
• https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2026-34330 · Vendor Advisory
• https://twitter.com/f1tym1/status/2055171277845901506 · Twitter Post
• https://twitter.com/windowsforum/status/2054262530814427501 · Twitter Post