CVE-2026-50385 in Windows
Summary
by MITRE • 07/14/2026
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Runtime allows an authorized attacker to elevate privileges locally.
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Analysis
by VulDB Data Team • 07/14/2026
This vulnerability represents a classic race condition flaw within the Windows Runtime environment that enables authenticated local attackers to achieve privilege escalation. The core issue stems from improper synchronization mechanisms when multiple threads or processes attempt concurrent access to shared resources within the runtime framework. When legitimate user processes interact with Windows Runtime components, they may inadvertently create scenarios where timing dependencies allow malicious code to exploit gaps in resource management protocols.
The technical implementation of this vulnerability leverages the fundamental principles of race conditions as defined by CWE-362, where two or more threads access shared data concurrently without proper mutual exclusion mechanisms. In Windows Runtime contexts, this manifests when authorized users can manipulate the timing of operations to gain unauthorized access to privileged resources or execute code with elevated privileges. The flaw typically occurs in scenarios involving inter-process communication, shared memory segments, or component object model interactions where synchronization primitives are either absent or inadequately implemented.
From an operational perspective, this vulnerability creates significant risk for local attackers who possess standard user credentials, as it bypasses typical security boundaries that separate user and system privileges. The attack vector requires the attacker to have legitimate login access to the system but does not demand administrative rights initially. Successful exploitation can result in complete system compromise through privilege escalation from standard user to SYSTEM level access, enabling persistent backdoor installation, credential theft, or further network infiltration activities.
The impact extends beyond immediate privilege escalation as it demonstrates deeper architectural weaknesses in Windows Runtime's concurrency model and resource management protocols. Attackers can leverage this condition to manipulate shared objects, modify system state, or inject malicious code into protected processes. This vulnerability aligns with ATT&CK technique T1068 which covers 'Local Privilege Escalation' and specifically addresses the use of race conditions for privilege elevation. Organizations should implement comprehensive monitoring solutions that detect anomalous concurrent access patterns and ensure proper synchronization mechanisms are enforced throughout all runtime components.
Mitigation strategies must focus on strengthening synchronization protocols within Windows Runtime environments, implementing proper mutual exclusion controls, and conducting thorough code reviews for concurrency-related vulnerabilities. System administrators should apply Microsoft security patches promptly, monitor for unauthorized privilege escalation attempts, and consider implementing additional security controls such as mandatory access controls or enhanced logging of concurrent resource access patterns. The vulnerability underscores the critical importance of robust concurrency management in system frameworks and demonstrates why proper synchronization mechanisms are essential for maintaining system integrity and preventing unauthorized privilege elevation through race condition exploitation.