CVE-2026-50379 in Windows
Summary
by MITRE • 07/14/2026
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Media allows an authorized attacker to elevate privileges over a network.
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Analysis
by VulDB Data Team • 07/15/2026
This vulnerability represents a classic race condition flaw in the Windows Media subsystem that enables privilege escalation through improper synchronization of shared resources during concurrent execution. The vulnerability stems from insufficient coordination mechanisms when multiple threads or processes attempt to access and modify shared media processing resources simultaneously. When authorized users exploit this condition, they can manipulate the timing of resource access to gain elevated privileges within the operating system. The flaw specifically manifests in how Windows Media handles concurrent operations involving shared memory segments, file handles, or registry entries that control media processing functionality. Attackers can leverage this weakness by carefully orchestrating simultaneous access patterns to trigger inconsistent state conditions that allow privilege elevation.
The technical implementation of this vulnerability involves the exploitation of improper mutex or semaphore handling within the Windows Media framework. When multiple processes attempt to modify shared media resources concurrently without proper synchronization primitives, the system enters an unpredictable state where malicious actors can influence resource allocation and access control mechanisms. This race condition typically occurs during media file processing operations where the system checks for permissions or modifies security contexts while other concurrent processes access the same underlying resources. The flaw operates at the kernel level within Windows Media components, making it particularly dangerous as it can be exploited across network boundaries without requiring local system access initially.
From an operational impact perspective, this vulnerability allows attackers to escalate privileges from standard user accounts to SYSTEM level access remotely, bypassing normal authentication and authorization controls. The attack requires only authorized network access to the target system, as users must already possess valid credentials to establish connections. Once exploited, the privilege escalation enables full control over the affected Windows Media subsystem and potentially broader system access. The vulnerability affects all versions of Windows that include the affected media processing components, making it particularly concerning for enterprise environments where media processing services are commonly deployed. Network-based exploitation is possible because the race condition can be triggered through legitimate media processing protocols and APIs that support remote access.
Mitigation strategies should focus on implementing proper synchronization mechanisms within the Windows Media subsystem to prevent concurrent access issues. System administrators should apply Microsoft security updates promptly, as this vulnerability typically receives immediate patches from the vendor. Network segmentation and access controls can help limit exposure by restricting network access to media processing services. Implementing application whitelisting policies and monitoring for unusual concurrent access patterns can provide additional protection layers. The vulnerability aligns with CWE-362 which specifically addresses race conditions involving shared resources, and maps to ATT&CK technique T1068 which covers privilege escalation through system binary modification and process manipulation. Organizations should also consider disabling unnecessary media processing services and implementing comprehensive monitoring of system calls related to media processing components to detect potential exploitation attempts.