CVE-2026-50345 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 • 07/15/2026
This vulnerability represents a classic race condition flaw within the Windows Runtime environment that enables local privilege escalation through improper synchronization of shared resources. The issue stems from concurrent execution patterns where multiple threads or processes attempt to access and modify the same resource without adequate protective mechanisms, creating temporal windows where system integrity can be compromised. Such race conditions occur when the operating system fails to properly coordinate access to shared memory segments, file handles, or registry entries during critical operations that could affect security boundaries.
The technical implementation of this vulnerability leverages the fundamental weakness in Windows Runtime's resource management protocols where synchronization primitives like mutexes, semaphores, or atomic operations are either absent, improperly configured, or bypassed during routine system operations. An authorized attacker with local access can exploit this condition by carefully timing their actions to manipulate shared resources while other processes are accessing them, potentially causing the system to execute malicious code with elevated privileges. The flaw typically manifests when legitimate system processes perform operations that should be atomic but instead allow concurrent access to sensitive data structures.
Operationally, this vulnerability poses significant risk as it requires only local user authentication to exploit, making it particularly dangerous in environments where user accounts have standard privileges. Attackers can leverage the race condition to inject malicious code into system processes or manipulate security-critical variables that control privilege levels and access controls. The exploitation process often involves creating multiple threads that race to modify shared resources, potentially causing the system to grant elevated permissions to unauthorized code or bypass security checks during resource modification operations. This type of vulnerability directly impacts the integrity and confidentiality of the operating system's security model.
Mitigation strategies for this vulnerability should focus on implementing proper synchronization mechanisms throughout the Windows Runtime components, including enhanced use of critical sections, mutexes, and atomic operations to prevent concurrent access to sensitive resources. System administrators should ensure that all Windows Runtime applications and services are properly patched with the latest security updates from Microsoft, as these vulnerabilities often require kernel-level fixes that address fundamental synchronization issues within the operating system's core components. Additionally, implementing strict access controls and monitoring for abnormal process behavior can help detect potential exploitation attempts, while following secure coding practices such as those outlined in the CWE-362 category for race conditions and the ATT&CK framework's privilege escalation techniques can provide comprehensive protection against this class of vulnerabilities.
The underlying architectural flaw represents a failure to properly implement the security principle of least privilege during resource access operations, where multiple concurrent processes should be required to obtain proper authorization before accessing shared system resources. This vulnerability type typically requires systematic code review and testing of all inter-process communication patterns within Windows Runtime environments to identify potential race conditions that could allow unauthorized privilege escalation. Organizations should conduct regular security assessments focusing on multi-threaded application behavior and implement comprehensive monitoring solutions that can detect suspicious concurrent access patterns to critical system resources, ensuring that the system maintains its integrity even when multiple processes attempt simultaneous access to shared data structures.
References to established security frameworks show this vulnerability aligns with CWE-362 (Race Condition) and maps directly to ATT&CK technique T1068 (Local Privilege Escalation) and T1547.001 (Registry Run Keys/Startup Folder), as attackers can manipulate system processes through shared resource exploitation to gain elevated privileges. The remediation process must address both the immediate code-level fixes required for proper synchronization and broader architectural improvements to prevent similar issues from emerging in future implementations of Windows Runtime components, ensuring that all concurrent access scenarios are properly protected against unauthorized manipulation that could compromise system security boundaries.