CVE-2026-21237

HIGH

Windows Subsystem for Linux - Privilege Escalation

Title source: llm

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 0.0002
EPSS Percentile 4.5%
Attack Vector LOCAL
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Classification

CWE
CWE-416 CWE-362
Status published

Affected Products (15)

microsoft/windows_10_21h2 < 10.0.19044.6937
microsoft/windows_10_21h2 < 10.0.19044.6937
microsoft/windows_10_21h2 < 10.0.19044.6937
microsoft/windows_10_22h2 < 10.0.19045.6937
microsoft/windows_10_22h2 < 10.0.19045.6937
microsoft/windows_10_22h2 < 10.0.19045.6937
microsoft/windows_11_23h2 < 10.0.22631.6649
microsoft/windows_11_23h2 < 10.0.22631.6649
microsoft/windows_11_24h2 < 10.0.26100.7781
microsoft/windows_11_24h2 < 10.0.26100.7781
microsoft/windows_11_25h2 < 10.0.26200.7781
microsoft/windows_11_25h2 < 10.0.26200.7781
microsoft/windows_server_2022 < 10.0.20348.4711
microsoft/windows_server_2022_23h2 < 10.0.25398.2149
microsoft/windows_server_2025 < 10.0.26100.32313

Timeline

Published Feb 10, 2026
Tracked Since Feb 18, 2026