CVE-2026-26177: Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability
Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
Other sources
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 10.0.19044.7184Patch KB5082200 - Upgrade
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Fixed in 10.0.17763.8644Patch KB5082123 - Upgrade
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Fixed in 10.0.19045.7184Patch KB5082200 - Upgrade
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Fixed in 10.0.28000.1836Patch KB5083768 - Upgrade
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Fixed in 10.0.20348.5020Patch KB5082142 - Upgrade
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Fixed in 6.2.9200.26026Patch KB5082127 - Upgrade
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Fixed in 6.3.9600.23132Patch KB5082126 - Upgrade
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Fixed in 10.0.26100.32690Patch KB5082063 - Upgrade
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Fixed in 10.0.14393.9060Patch KB5082198 - Upgrade
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Fixed in 10.0.26100.8246Patch KB5083769 - Upgrade
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Fixed in 10.0.22631.6936Patch KB5082052 - Upgrade
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Fixed in 10.0.25398.2274Patch KB5082060 - Upgrade
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Fixed in 10.0.26200.8246Patch KB5083769
Event History
Frequently Asked Questions
What is the severity of CVE-2026-26177?
CVE-2026-26177 is rated as a critical vulnerability allowing elevation of privileges.
How do I fix CVE-2026-26177?
To fix CVE-2026-26177, apply the latest security update provided by Microsoft.
Which systems are affected by CVE-2026-26177?
CVE-2026-26177 affects various versions of Microsoft Windows including Windows 10 and Windows 11.
Is CVE-2026-26177 a remote or local vulnerability?
CVE-2026-26177 is a local vulnerability that requires physical access or authenticated user status.
What can happen if CVE-2026-26177 is exploited?
If exploited, CVE-2026-26177 can allow an attacker to gain elevated privileges on the affected system.