EUVD-2026-29585
GHSA-3mv2-86j6-x44q
CVSS VectorNVD
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionNVD
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Win32K - GRFX allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in Windows Win32K GRFX component allows authenticated low-privilege users to gain SYSTEM-level access through race condition exploitation. Affects Windows 10 (1809, 21H2, 22H2), Windows 11 (22H3 through 26H1), and Windows Server 2019 including Server Core installations. …
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RemediationAI
Within 24 hours: Inventory all affected Windows versions (Windows 10 versions 1809/21H2/22H2, Windows 11 versions 22H3-26H1, Windows Server 2019) in your environment. Within 7 days: Deploy Microsoft May 2026 security updates to all affected systems, prioritizing Server 2019 and multi-user endpoints; test patches in staging environment before production rollout. …
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