CVE-2026-34334: Windows TCP/IP Elevation of Privilege Vulnerability
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows TCP/IP allows an authorized attacker to elevate privileges locally.
Other sources
Windows TCP/IP Elevation of Privilege Vulnerability
— Microsoft
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
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Fixed in 10.0.14393.9140Patch KB5087537 - Upgrade
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Fixed in 6.2.9200.26079Patch KB5087470 - Upgrade
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Fixed in 6.3.9600.23181Patch KB5087471 - Upgrade
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Fixed in 10.0.28000.2113Patch KB5089548 - Upgrade
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Fixed in 10.0.26100.32860Fixed in 10.0.26100.32772Patch KB5087423 - Upgrade
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Fixed in 10.0.25398.2330Patch KB5087541 - Upgrade
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Fixed in 10.0.26100.8457Fixed in 10.0.26100.8390Patch KB5089466 - Upgrade
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Fixed in 10.0.22631.7079Patch KB5087420 - Upgrade
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Fixed in 10.0.22631.7219Patch KB5093998 - Upgrade
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Fixed in 10.0.26200.8457Fixed in 10.0.26200.8390Patch KB5089466 - Upgrade
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Fixed in 10.0.19045.7417Patch KB5094127 - Upgrade
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Fixed in 10.0.19044.7291Patch KB5087544 - Upgrade
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Fixed in 10.0.17763.8755Patch KB5087538 - Upgrade
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Fixed in 10.0.20348.5139Fixed in 10.0.20348.5074Patch KB5087424
Event History
Frequently Asked Questions
What is the severity of CVE-2026-34334?
CVE-2026-34334 has been rated as a critical elevation of privilege vulnerability in Windows TCP/IP.
How do I fix CVE-2026-34334?
To fix CVE-2026-34334, apply the latest security updates provided by Microsoft for the affected versions of Windows.
What are the affected software versions for CVE-2026-34334?
CVE-2026-34334 affects multiple versions including Windows Server 2012 R2, Windows 10, and Windows 11 among others.
Can CVE-2026-34334 be exploited remotely?
No, CVE-2026-34334 can only be exploited locally by an authorized attacker.
What type of vulnerability is CVE-2026-34334?
CVE-2026-34334 is an elevation of privilege vulnerability caused by improper synchronization in Windows TCP/IP.