CVE-2026-34330: Win32k Elevation of Privilege Vulnerability
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Win32K - GRFX allows an authorized attacker to elevate privileges locally.
Other sources
Integer overflow or wraparound in Windows Win32K - GRFX allows an authorized attacker to elevate privileges locally.
— Microsoft
Win32k Elevation of Privilege Vulnerability
— Microsoft
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.25398.2330Patch KB5087541 - Upgrade
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Fixed in 10.0.26200.8457Fixed in 10.0.26200.8390Patch KB5089466 - Upgrade
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Fixed in 10.0.26100.32860Fixed in 10.0.26100.32772Patch KB5087423 - Upgrade
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Fixed in 10.0.22631.7079Patch KB5087420 - Upgrade
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Fixed in 10.0.22631.7219Patch KB5093998 - Upgrade
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Fixed in 10.0.19045.7417Patch KB5094127 - Upgrade
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Fixed in 10.0.28000.2113Patch KB5089548 - Upgrade
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Fixed in 6.3.9600.23181Patch KB5087471 - Upgrade
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Fixed in 10.0.26100.8457Fixed in 10.0.26100.8390Patch KB5089466 - Upgrade
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Fixed in 10.0.19044.7291Patch KB5087544 - Upgrade
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Fixed in 6.2.9200.26079Patch KB5087470 - Upgrade
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Fixed in 10.0.14393.9140Patch KB5087537 - Upgrade
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Fixed in 10.0.20348.5139Fixed in 10.0.20348.5074Patch KB5087424 - Upgrade
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Fixed in 10.0.17763.8755Patch KB5087538
Event History
Frequently Asked Questions
What is the severity of CVE-2026-34330?
CVE-2026-34330 is rated as a critical elevation of privilege vulnerability in Microsoft Windows.
How do I fix CVE-2026-34330?
You can mitigate CVE-2026-34330 by applying the latest security updates released by Microsoft for affected Windows versions.
Which systems are affected by CVE-2026-34330?
CVE-2026-34330 affects various versions of Microsoft Windows, including Windows 10 and Windows Server editions.
Can I exploit CVE-2026-34330 remotely?
No, CVE-2026-34330 requires local access for exploitation, making it an elevation of privilege vulnerability.
Is there a workaround for CVE-2026-34330?
At this time, the primary recommendation is to install security patches provided by Microsoft as there are no known effective workarounds.