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High severity7.8NVD Advisory· Published Jun 9, 2026· Updated Jun 9, 2026

CVE-2026-45638

CVE-2026-45638

Description

Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

Affected products

1

Microsoft/Windows Ancillary Function Driver for WinSockllm-fuzzy

Patches

0

No patches discovered yet.

Vulnerability mechanics

AI mechanics synthesis has not run for this CVE yet.

References

1

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45638nvd

News mentions

3

Microsoft June 2026 Patch Tuesday fixes 3 zero-day, 200 flaws
BleepingComputer · Jun 9, 2026
Microsoft Patch Tuesday June 2026 – 198 Vulnerabilities Fixed, Including 3 Zero-days
Cyber Security News · Jun 9, 2026
Microsoft Windows Ancillary Function Driver: Seven Use-After-Free Flaws Disclosed
Vypr Intelligence · Jun 9, 2026