Race Condition Vulnerability in Windows Subsystem for Linux by Microsoft
CVE-2026-21237

7HIGH

Key Information:

Vendor

Microsoft
Status
Windows Server 2022
Windows 10 Version 21h2
Windows 10 Version 22h2
Windows Server 2025 (server Core Installation)
Vendor
CVE Published:
10 February 2026

What is CVE-2026-21237?

A race condition vulnerability exists in Windows Subsystem for Linux that allows an authorized attacker to exploit improper synchronization when executing commands. This flaw can enable the attacker to elevate their privileges locally, potentially allowing unauthorized access to sensitive information or capability to execute malicious actions within the system. It is essential for users and administrators to apply available patches and updates to mitigate this vulnerability's impact.

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Affected Version(s)

Windows 10 Version 21H2 32-bit Systems 10.0.19044.0 < 10.0.19044.6937

Windows 10 Version 22H2 x64-based Systems 10.0.19045.0 < 10.0.19045.6937

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

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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