Description

Improper access control in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

INFO

Published Date :

2026-02-10T17:51:46.513Z

Last Modified :

2026-02-11T19:49:10.046Z

Source :

microsoft
AFFECTED PRODUCTS

The following products are affected by CVE-2026-21238 vulnerability.

Vendors Products
Microsoft
  • Windows 10 1607
  • Windows 10 1809
  • Windows 10 21h2
  • Windows 10 21h2
  • Windows 10 22h2
  • Windows 10 22h2
  • Windows 11 23h2
  • Windows 11 23h2
  • Windows 11 24h2
  • Windows 11 24h2
  • Windows 11 25h2
  • Windows 11 25h2
  • Windows 11 26h1
  • Windows Server 2012
  • Windows Server 2012 R2
  • Windows Server 2016
  • Windows Server 2019
  • Windows Server 2022
  • Windows Server 2022 23h2
  • Windows Server 2025
  • Windows Server 23h2
REFERENCES

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-21238.

URL Resource
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21238 cve-icon cve-icon
Login to claim this CVE

CVSS Vulnerability Scoring System

Detailed values of each vector for above chart.
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact