CVE-2026-21242

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 Use After Free Windows Server 2022 Windows Server 2022 23h2 Windows 10 22h2 Windows Server 2025 Windows 11 24h2 Windows 10 21h2 Windows 11 25h2 Windows 11 23h2 Microsoft

Description

Use after free in Windows Subsystem for Linux allows an authorized attacker to elevate privileges locally.

Analysis

Windows Subsystem for Linux contains a use-after-free vulnerability that enables local privilege escalation for authenticated users. An attacker with valid local access could exploit this memory safety flaw to gain elevated system privileges on affected Windows Server 2022 systems.

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Remediation

Within 24 hours: Inventory all systems running WSL and assess which users have local access; communicate risk to affected teams. Within 7 days: Implement compensating controls (disable WSL where not essential, restrict local administrator rights, enable audit logging for privilege escalation attempts). …

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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-2026-21242 vulnerability details – vuln.today
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