CVE-2026-42979 in Windows
Summary
by MITRE • 06/09/2026
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Push Notifications 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 in the Windows Push Notifications subsystem that enables local privilege escalation through improper synchronization of shared resources during concurrent execution. The issue manifests when multiple threads or processes attempt to access and modify shared system resources without adequate locking mechanisms, creating temporal windows where malicious code can exploit the inconsistent state of these resources.
The technical implementation involves a race condition within the push notification handling mechanism where an authorized local user can manipulate the timing of concurrent operations to gain elevated privileges. This flaw typically occurs when the system fails to properly synchronize access to critical shared objects or memory regions during the processing of push notifications, allowing malicious code to interfere with legitimate operations and potentially execute with higher privileges than originally intended.
From an operational perspective this vulnerability presents a significant risk as it requires only local user access to exploit, making it particularly dangerous in environments where users may have legitimate access to systems but should not possess administrative privileges. The attack vector leverages the fact that Windows Push Notifications service operates with elevated privileges and maintains shared resources that are accessed concurrently by multiple processes or threads without proper mutual exclusion mechanisms.
The underlying cause of this vulnerability aligns with CWE-362, which specifically addresses race conditions in concurrent programming where improper synchronization leads to security flaws. This weakness creates opportunities for attackers to manipulate system state during the brief periods when resource access is not properly protected, potentially allowing them to modify critical system components or escalate their privileges.
Attackers can exploit this condition by creating multiple concurrent processes that attempt to access and modify the same shared resources within the push notification subsystem, carefully timing their operations to take advantage of the synchronization gaps. The attack typically involves manipulating the order of operations in a way that causes the system to process malicious input with elevated privileges rather than the intended user-level permissions.
Mitigation strategies should focus on implementing proper synchronization mechanisms using mutexes, semaphores, or other mutual exclusion primitives to prevent concurrent access to shared resources during critical operations. System administrators should ensure that Windows updates are applied promptly to address known race condition vulnerabilities in push notification services, while also implementing least privilege principles to minimize the impact of potential exploitation.
Security frameworks such as the ATT&CK matrix categorize this type of vulnerability under privilege escalation techniques, specifically targeting local system privileges through software exploitation. Organizations should conduct regular security assessments of their Windows environments to identify and remediate similar race condition vulnerabilities across other system components that may exhibit similar synchronization issues. The implementation of proper code review processes and static analysis tools can help prevent such flaws during the development lifecycle, while monitoring solutions should be deployed to detect anomalous behavior patterns that might indicate exploitation attempts against these types of vulnerabilities.
This vulnerability demonstrates the critical importance of proper concurrent programming practices in security-sensitive system components, where even authorized users with legitimate access can potentially exploit race conditions to gain unauthorized privileges. The remediation approach requires both immediate patching of affected systems and long-term improvements to development practices to ensure that shared resource access is properly synchronized across all system services and components that may be subject to concurrent execution scenarios.