CVE-2026-42911

highCVSS 7covered by 1 sourcefirst seen 2026-06-09

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

CSIRTS triage

What: An authorized attacker can elevate privileges locally due to a use-after-free vulnerability.
Who is affected: Users of the Windows Ancillary Function Driver for WinSock are affected.
Urgency: Remediation is high urgency due to the potential for privilege escalation.
Action: Apply the latest security patches.

AI-assisted analysis generated from the source advisory — verify against the original.

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Low exploitation risk0.23% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 14% of all EPSS-scored CVEs.

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