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CVE-2026-61348: Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability

highCVSS 7CVE-2026-61348
Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

CSIRTS triage

vendor: Microsoftproduct: Windows Ancillary Function Driver for WinSockPrivilege escalationMemory corruption
What
Use after free in Windows Ancillary Function Driver for WinSock allows local privilege escalation by an authorized attacker.
Who is affected
Windows systems with Winsock driver where an authorized local user is present.
Urgency
High severity (CVSS 7.0) but not currently exploited; should be patched in the next security update cycle.
Action
Apply Windows security updates when available from Microsoft.

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

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
high — CVSS 7
Published
2026-08-11
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-61348

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-61348coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

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