CVE-2026-35416: Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability
Access of resource using incompatible type ('type confusion') in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
Other sources
Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
— Microsoft
Windows Ancillary Function Driver for WinSock 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 10.0.19045.7417Patch KB5094127 - Upgrade
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Fixed in 10.0.26100.32860Fixed in 10.0.26100.32772Patch KB5087423 - Upgrade
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Fixed in 10.0.19044.7291Patch 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 10.0.17763.8755Patch KB5087538 - Upgrade
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Fixed in 6.3.9600.23181Patch KB5087471 - 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 10.0.28000.2113Patch KB5089548 - Upgrade
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Fixed in 10.0.26100.8457Fixed in 10.0.26100.8390Patch KB5089466 - Upgrade
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Fixed in 10.0.22631.7219Patch KB5093998 - 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
Event History
Frequently Asked Questions
What is the severity of CVE-2026-35416?
CVE-2026-35416 has a severity rating of high due to its potential for unauthorized local privilege escalation.
How do I fix CVE-2026-35416?
To fix CVE-2026-35416, apply the latest security updates and patches provided by Microsoft for the affected Windows products.
What products are affected by CVE-2026-35416?
CVE-2026-35416 affects multiple versions of Windows, including Windows 10, Windows 11, and various Windows Server editions.
Can CVE-2026-35416 be exploited remotely?
CVE-2026-35416 requires local access to the system for exploitation, hence it cannot be exploited remotely.
Is there a workaround for CVE-2026-35416?
No official workarounds are provided for CVE-2026-35416; applying the security update is the recommended course of action.