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CVE-2026-33839 is a local privilege escalation vulnerability in the Windows Win32k GRFX kernel-mode graphics subsystem. The flaw is caused by improper synchronization during concurrent access to a shared resource, resulting in a race condition in kernel-mode graphics processing. An authenticated local attacker with low privileges can exploit the condition by winning the race and corrupting internal kernel state, leading to elevation of privilege. The vulnerability affects supported Windows client and server releases prior to the patched builds issued in May 2026.
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What an attacker gets, and what they’ve been doing with it.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Windows Win32K - GRFX elevation of privilege vulnerability caused by a race condition that allows a locally authorized attacker to gain elevated privileges, potentially SYSTEM.
A local privilege escalation vulnerability in the Windows Win32k graphics subsystem caused by improper synchronization/race condition, allowing an authenticated local user to gain SYSTEM privileges.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.