Windows CVE-2026-21242
HIGHCVSS VectorNVD
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionNVD
Use after free in Windows Subsystem for Linux allows an authorized attacker to elevate privileges locally.
AnalysisAI
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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RemediationAI
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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