CVE-2026-21237

high Microsoft
CVSS v3 Base Score
7.0
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
EPSS Score
0.0%
Exploitation probability in 30 days
Top 95% most likely to be exploited
Attack Characteristics
Attack Vector
Local
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Confidentiality
High
Integrity
High
Availability
High
Published: February 10, 2026 (93 days ago)
Last Modified: March 13, 2026
Vendor: Microsoft
Source: MITRE

Description

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

CWE

CWE-362

Affected Products

Microsoft Windows 10 Version 21H2Microsoft Windows 10 Version 22H2Microsoft Windows 11 version 22H3Microsoft Windows 11 Version 23H2Microsoft Windows 11 Version 24H2Microsoft Windows 11 Version 25H2Microsoft Windows 11 version 26H1Microsoft Windows 11 Version 26H1Microsoft Windows Server 2022Microsoft Windows Server 2022, 23H2 Edition (Server Core installation)

References

🔗 msrc.microsoft.com