Jun 2026: Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability
CVE-2026-45638 Published on June 9, 2026
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.
Weakness Type
Heap-based Buffer Overflow
A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().
Products Associated with CVE-2026-45638
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Affected Versions
Microsoft Windows 10 Version 1607:- Version 10.0.14393.0 and below 10.0.14393.9234 is affected.
- Version 10.0.17763.0 and below 10.0.17763.8880 is affected.
- Version 10.0.19044.0 and below 10.0.19044.7417 is affected.
- Version 10.0.19045.0 and below 10.0.19045.7417 is affected.
- Version 10.0.22631.0 and below 10.0.22631.7219 is affected.
- Version 10.0.22631.0 and below 10.0.22631.7219 is affected.
- Version 10.0.26100.0 and below 10.0.26100.8655 is affected.
- Version 10.0.26200.0 and below 10.0.26200.8655 is affected.
- Version 10.0.28000.0 and below 10.0.28000.2269 is affected.
- Version 6.2.9200.0 and below 6.2.9200.26132 is affected.
- Version 6.2.9200.0 and below 6.2.9200.26132 is affected.
- Version 6.3.9600.0 and below 6.3.9600.23228 is affected.
- Version 6.3.9600.0 and below 6.3.9600.23228 is affected.
- Version 10.0.14393.0 and below 10.0.14393.9234 is affected.
- Version 10.0.14393.0 and below 10.0.14393.9234 is affected.
- Version 10.0.17763.0 and below 10.0.17763.8880 is affected.
- Version 10.0.17763.0 and below 10.0.17763.8880 is affected.
- Version 10.0.20348.0 and below 10.0.20348.5256 is affected.
- Version 10.0.26100.0 and below 10.0.26100.32995 is affected.
- Version 10.0.26100.0 and below 10.0.26100.32995 is affected.