CVE-2026-21231
HIGHCVSS Vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Lifecycle Timeline
2Tags
Description
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Kernel allows an authorized attacker to elevate privileges locally.
Analysis
Windows Kernel privilege escalation vulnerability in Windows 10 21H2 and Windows Server 2012 stems from improper synchronization of concurrent access to shared resources, enabling local authenticated users to gain elevated system privileges. The race condition can be triggered without user interaction and impacts confidentiality, integrity, and availability of the affected system. …
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Remediation
Within 24 hours: Inventory all Windows systems in your environment and assess which have user populations with local logon access; communicate risk to business stakeholders. Within 7 days: Implement compensating controls including restriction of local administrator privileges, disable unnecessary local logon where possible, and enforce principle of least privilege for all user accounts. …
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External POC / Exploit Code
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