CVE-2026-54107
Summary
by MITRE • 07/14/2026
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Win32K 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 Win32K subsystem that enables local privilege escalation through improper synchronization of concurrent execution paths. The issue resides in how the kernel-mode graphics component handles shared resources during multi-threaded operations, creating opportunities for malicious code to manipulate system state before legitimate operations complete. Attackers can exploit this weakness by carefully orchestrating simultaneous access attempts to vulnerable kernel objects, leveraging timing dependencies that allow them to inject malicious code or modify critical data structures before proper synchronization mechanisms can prevent such interference.
The technical implementation of this vulnerability stems from inadequate mutual exclusion controls within Win32K's object management routines where multiple threads can access shared kernel resources without proper locking mechanisms. This allows an attacker with standard user privileges to manipulate the execution flow by racing against legitimate system operations, potentially causing privilege escalation to kernel mode. The flaw specifically affects Windows operating systems where Win32K handles graphics-related kernel operations and window management functions, making it particularly dangerous in environments where users can execute arbitrary code locally.
From an operational perspective, this vulnerability presents a significant risk because it requires minimal privileges for exploitation and can result in complete system compromise when successfully exploited. The attack vector typically involves a local user executing a specially crafted application that creates multiple threads competing for access to vulnerable Win32K objects, ultimately manipulating kernel memory structures to gain elevated privileges. This type of vulnerability is particularly concerning in enterprise environments where users may have legitimate access to systems but could potentially abuse such flaws for unauthorized privilege escalation.
The mitigation strategies for this race condition vulnerability focus on implementing proper synchronization mechanisms and ensuring that all shared resources within the Win32K subsystem are properly protected against concurrent access. Microsoft typically addresses such issues through kernel-mode patches that enforce stricter locking protocols around vulnerable objects, though organizations should also implement comprehensive monitoring solutions to detect suspicious concurrent access patterns. The flaw aligns with CWE-362 which specifically addresses race conditions in concurrent execution environments, and maps to ATT&CK technique T1068 which covers local privilege escalation through kernel exploits. System administrators should prioritize applying security updates promptly and consider implementing additional controls such as kernel-mode protection features and behavioral monitoring to detect potential exploitation attempts.