Unrated severityNVD Advisory· Published Feb 10, 2026· Updated Apr 10, 2026

Windows Subsystem for Linux Elevation of Privilege Vulnerability

CVE-2026-21237

Description

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

Affected products

Microsoft/Windows 10 1607cpe-rescue2 versions
10.0.19044.0+ 1 more
- (no CPE)range: 10.0.19044.0
- (no CPE)range: 10.0.19045.0
Microsoft/Windows 11 version 22H3v5
Range: 10.0.22631.0
Microsoft/Windows 11 23h2cpe-rescue
Range: 10.0.22631.0
Microsoft/Windows 11 24h2cpe-rescue
Range: 10.0.26100.0
Microsoft/Windows 11 25h2cpe-rescue
Range: 10.0.26200.0
Microsoft/Windows 11 26h1cpe-rescue
Range: 10.0.28000.0
Microsoft/Windows Server 2003cpe-rescue
Range: 10.0.20348.0
Microsoft/Windows Server 2022, 23H2 Edition (Server Core installation)v5
Range: 10.0.25398.0
Microsoft/Windows Server 2025cpe-rescue
Range: 10.0.26100.0
Microsoft/Windows Server 2025 (Server Core installation)v5
Range: 10.0.26100.0

Patches

Vulnerability mechanics

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21237mitrevendor-advisorypatch

News mentions

No linked articles in our index yet.

cvss	0.000
epss	0.000
exploit	0.000
kev	0.000
patch	0.000
ransomware	0.000