CVE-2026-21237

HIGH
2026-02-10 [email protected]
7.0
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Local
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

2
Analysis Generated
Mar 12, 2026 - 22:02 vuln.today
CVE Published
Feb 10, 2026 - 18:16 nvd
HIGH 7.0

Tags

Linux Windows Race Condition Windows 11 23h2 Windows 10 22h2 Windows Server 2022 23h2 Windows 11 25h2 Windows Server 2022 Windows 10 21h2 Windows 11 24h2 Windows Server 2025 Microsoft

Description

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

Analysis

Local privilege escalation in Windows Subsystem for Linux affects Windows 11 23h2 and Windows 10 22h2 through a race condition in shared resource synchronization. An authenticated local attacker can exploit this vulnerability to gain elevated privileges on the system. …

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Remediation

Within 24 hours: Identify all systems running WSL and assess user access levels; notify development and infrastructure teams of the vulnerability. Within 7 days: Implement compensating controls including disabling WSL where not business-critical, restricting WSL access to trusted users only, and enforcing principle of least privilege for existing WSL users. …

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Priority Score

35
Low Medium High Critical
KEV: 0
EPSS: +0.0
CVSS: +35
POC: 0

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CVE-2026-21237 vulnerability details – vuln.today
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