Summary
Impact: Elevation of Privilege. Microsoft rating: Important. Not known to be exploited — Exploitation Less Likely. Customer action: Required.
Details
According to the CVSS metric, the attack complexity is high (AC:H). What does that mean for this vulnerability?
Successful exploitation of this vulnerability requires an attacker to win a race condition.
What privileges could be gained by an attacker who successfully exploited this vulnerability?
An attacker who successfully exploited this vulnerability could gain SYSTEM privileges.
Security updates
10.0.28000.1836 — https://support.microsoft.com/help/5083768
10.0.17763.8644 — https://support.microsoft.com/help/5082123
10.0.20348.5020 — https://support.microsoft.com/help/5082142
10.0.19044.7184 — https://support.microsoft.com/help/5082200
10.0.26100.32690 — https://support.microsoft.com/help/5082063
10.0.26200.8246 — https://support.microsoft.com/help/5083769
10.0.22631.6936 — https://support.microsoft.com/help/5082052
10.0.25398.2274 — https://support.microsoft.com/help/5082060
10.0.14393.9060 — https://support.microsoft.com/help/5082198
6.2.9200.26026 — https://support.microsoft.com/help/5082127
6.3.9600.23132 — https://support.microsoft.com/help/5082126
Vulnerabilities 1
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High 7.0
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.
Revision history
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#1
Information published.
References
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CVE-2026-27922 Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-27922
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Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
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Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
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Common Vulnerability Scoring System
https://www.first.org/cvss