CVE-2026-33839: 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
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 10.0.26100.8457Fixed in 10.0.26100.8390Patch KB5089466 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.17763.8755Patch KB5087538 - Upgrade
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Fixed in 10.0.26100.32860Fixed in 10.0.26100.32772Patch KB5087423 - Upgrade
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Fixed in 10.0.28000.2113Patch KB5089548 - Upgrade
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Fixed in 10.0.25398.2330Patch KB5087541 - Upgrade
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Fixed in 10.0.22631.7079Patch KB5087420 - Upgrade
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Fixed in 10.0.26200.8457Fixed in 10.0.26200.8390Patch KB5089466 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.19044.7291Patch KB5087544 - Upgrade
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Fixed in 10.0.20348.5139Fixed in 10.0.20348.5074Patch KB5087424 - Upgrade
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Fixed in 10.0.19045.7417Patch KB5094127 - Upgrade
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Fixed in 10.0.22631.7219Patch KB5093998
Event History
Frequently Asked Questions
What is the severity of CVE-2026-33839?
CVE-2026-33839 is classified as an elevation of privilege vulnerability that can allow an authorized attacker to elevate their privileges locally.
How do I fix CVE-2026-33839?
To mitigate CVE-2026-33839, apply the latest security updates provided by Microsoft for the affected versions of Windows.
Which systems are affected by CVE-2026-33839?
CVE-2026-33839 affects various versions of Microsoft Windows, including Windows 10, Windows 11, and Windows Server 2019, among others.
Can CVE-2026-33839 be exploited remotely?
No, CVE-2026-33839 requires local access to the affected system for exploitation.
What should I do if my system is vulnerable to CVE-2026-33839?
If your system is vulnerable to CVE-2026-33839, ensure that you apply security patches and updates as soon as they are available.