CVE-2026-26173

| EUVD-2026-22408 HIGH
2026-04-14 microsoft
Information Disclosure Race Condition Microsoft Windows 10 Version 1607 Windows 10 Version 1809 Windows 10 Version 21H2 Windows 10 Version 22H2 Windows 11 Version 22H3 Windows 11 Version 23H2 Windows 11 Version 24H2 Windows 11 Version 25H2 Windows 11 Version 26H1 Windows Server 2012 Windows Server 2012 Server Core Installation Windows Server 2012 R2 Windows Server 2012 R2 Server Core Installation Windows Server 2016 Windows Server 2016 Server Core Installation Windows Server 2019 Windows Server 2019 Server Core Installation Windows Server 2022 Windows Server 2022 23H2 Edition Server Core Installation Windows Server 2025 Windows Server 2025 Server Core Installation
7.0
CVSS 3.1
Temporal: 6.1
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CVSS VectorNVD

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Local
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

1
Analysis Generated
Apr 14, 2026 - 19:27 vuln.today

DescriptionNVD

Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

AnalysisAI

Local privilege escalation in Windows Ancillary Function Driver for WinSock (AFD.sys) across Windows 10, 11, and Server 2012-2025 allows low-privileged authenticated attackers to gain SYSTEM-level access via race condition exploitation. The vulnerability affects widespread Windows deployments spanning a decade of operating system versions, from Server 2012 (6.2.9200.0) through Windows 11 26H1 and Server 2025. …

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RemediationAI

Within 24 hours: Inventory all Windows 10, Windows 11, and Server 2012-2025 systems in your environment and identify current patch levels. Within 7 days: Deploy Microsoft-released patches for AFD.sys across all affected operating system versions (specific KB articles and patch versions available from Microsoft Security Updates portal). …

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CVE-2026-26173 vulnerability details – vuln.today
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