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High severity7.0NVD Advisory· Published Aug 11, 2026· Updated Aug 11, 2026

CVE-2026-70307

CVE-2026-70307

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

Vulnerability mechanics

References

1

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70307nvd

News mentions

2

Microsoft's August 2026 Patch Tuesday Addresses 398 CVEs (CVE-2026-68820)
Tenable Blog · Aug 11, 2026
Microsoft Patch Tuesday Update August 2026 – 394 Vulnerabilities Fixed, Including 3 Zero-Days
Cyber Security News · Aug 11, 2026