Elevation of Privilege Vulnerability in Windows Ancillary Function Driver by Microsoft
CVE-2026-21241

7HIGH

Key Information:

Vendor

Microsoft
Status
Windows 11 Version 26h1
Windows 11 Version 26h1
Windows Server 2022
Windows Server 2025 (server Core Installation)
Vendor
CVE Published:
10 February 2026

What is CVE-2026-21241?

A vulnerability has been identified in the Windows Ancillary Function Driver for WinSock, which may allow a local attacker to exploit a use-after-free condition. This flaw could enable an attacker with authorized access to escalate their privileges, potentially gaining greater control over the system. It's crucial for users to apply security patches to mitigate this risk and protect their systems against unauthorized access.

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Affected Version(s)

Windows 11 version 22H3 ARM64-based Systems 10.0.22631.0 < 10.0.22631.6649

Windows 11 Version 23H2 x64-based Systems 10.0.22631.0 < 10.0.22631.6649

Windows 11 Version 24H2 ARM64-based Systems 10.0.26100.0 < 10.0.26100.7840

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE...
vendor-advisorypatch

CVSS V3.1

Score:
7
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
High
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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