CVE-2026-21237

HIGH

Windows Subsystem for Linux - Privilege Escalation

Title source: llm
STIX 2.1

Description

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

References (1)

Scores

CVSS v3 7.0
EPSS 0.0003
EPSS Percentile 9.3%
Attack Vector LOCAL
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact total

Details

CWE
CWE-416 CWE-362
Status published
Products (20)
Microsoft/Windows 10 Version 21H2 10.0.19044.0 - 10.0.19044.6937
Microsoft/Windows 10 Version 22H2 10.0.19045.0 - 10.0.19045.6937
Microsoft/Windows 11 version 22H3 10.0.22631.0 - 10.0.22631.6649
Microsoft/Windows 11 Version 23H2 10.0.22631.0 - 10.0.22631.6649
Microsoft/Windows 11 Version 24H2 10.0.26100.0 - 10.0.26100.7840
Microsoft/Windows 11 Version 25H2 10.0.26200.0 - 10.0.26200.7840
Microsoft/Windows 11 version 26H1 10.0.28000.0 - 10.0.28000.1575
Microsoft/Windows 11 Version 26H1 10.0.28000.0 - 10.0.28000.1575
Microsoft/Windows Server 2022 10.0.20348.0 - 10.0.20348.4773
Microsoft/Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.0 - 10.0.25398.2149
... and 10 more
Published Feb 10, 2026
Tracked Since Feb 18, 2026