Windows Ancillary Function Driver Privilege Escalation Vulnerability by Microsoft
CVE-2026-27922

7HIGH

Key Information:

Vendor

Microsoft
Status
Windows 10 Version 1607
Windows 10 Version 1809
Windows 10 Version 21h2
Windows 10 Version 22h2
Vendor
CVE Published:
14 April 2026

What is CVE-2026-27922?

The Windows Ancillary Function Driver for WinSock has a use after free vulnerability that could potentially allow an authenticated attacker to elevate their privileges on the affected system locally. This issue arises from improper memory management, creating opportunities for exploitation. It is crucial for users and administrators to apply the recommended security updates to mitigate the risks associated with this vulnerability.

Affected Version(s)

Windows 10 Version 1607 32-bit Systems 10.0.14393.0 < 10.0.14393.9060

Windows 10 Version 1809 32-bit Systems 10.0.17763.0 < 10.0.17763.8644

Windows 10 Version 21H2 32-bit Systems 10.0.19044.0 < 10.0.19044.7184

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

.