CVE-2026-50440 in Windows
Summary
by MITRE • 07/14/2026
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Audio Service allows an authorized attacker to elevate privileges locally.
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Analysis
by VulDB Data Team • 07/14/2026
A critical race condition vulnerability exists within the Windows Audio Service that enables local privilege escalation through improper synchronization of shared resources during concurrent execution. This flaw resides in the audio service's handling of temporary files or registry entries that are accessed simultaneously by multiple processes, creating opportunities for malicious code injection and privilege elevation. The vulnerability manifests when an authorized attacker exploits timing gaps in resource management, allowing them to manipulate shared components while the service is processing audio-related operations. Attackers can leverage this race condition to inject malicious code into the privileged audio service context, thereby gaining elevated system privileges that would normally be restricted to administrators or system processes.
The technical implementation of this vulnerability follows established patterns described in CWE-367, which specifically addresses time-of-check to time-of-use race conditions where an attacker can manipulate resources between validation and usage phases. The Windows Audio Service operates with elevated privileges to manage audio devices and system sound configurations, making it an attractive target for privilege escalation attacks. When multiple threads or processes access shared audio service resources without proper mutual exclusion mechanisms, attackers can exploit the window of opportunity between resource validation and actual usage to substitute legitimate files with malicious equivalents or manipulate registry entries that control service behavior.
The operational impact of this vulnerability extends beyond simple privilege escalation as it represents a fundamental flaw in Windows system security architecture. The audio service typically runs with high privileges to ensure proper multimedia functionality, but this elevated status creates a significant attack surface when combined with improper synchronization mechanisms. Attackers can execute this exploit through local access points such as standard user accounts or low-privilege processes that can trigger the audio service operations. The vulnerability affects systems where the audio service is actively running and processing audio requests, potentially enabling attackers to establish persistent access to compromised systems while maintaining elevated privileges for extended periods.
Mitigation strategies should focus on implementing proper synchronization mechanisms within the audio service codebase to prevent concurrent access issues. Microsoft recommends applying security updates promptly through Windows Update channels as these patches typically address race condition vulnerabilities by introducing proper locking mechanisms and resource validation procedures. Organizations should also implement monitoring solutions that detect unusual activity patterns in audio service operations, particularly around file creation or registry modifications. The ATT&CK framework categorizes this type of vulnerability under privilege escalation techniques, specifically targeting service execution and process injection methods. System administrators should consider implementing least-privilege principles for audio service configurations and regularly review service permissions to minimize the potential impact of such vulnerabilities. Additionally, intrusion detection systems can be configured to alert on suspicious file access patterns or registry modifications that might indicate exploitation attempts against shared resource synchronization flaws.