CVE-2026-54112
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 shared resources during concurrent execution. The issue manifests when multiple threads or processes attempt to access and modify the same kernel-level resources without adequate mutual exclusion mechanisms, creating opportunities for malicious code to exploit temporal windows where resource states are inconsistent. The vulnerability exists within the graphics subsystem's kernel-mode drivers that handle user interface operations, making it particularly dangerous as it can be leveraged by attackers who already have user-level access to escalate their privileges to system level. This type of race condition falls under CWE-362 which specifically addresses concurrent execution using shared resources with improper synchronization, and aligns with ATT&CK technique T1068 which covers privilege escalation through local exploits.
The technical implementation of this vulnerability involves the manipulation of kernel objects or data structures that are accessed concurrently by different execution contexts without proper locking mechanisms. When an attacker can predict or influence the timing of these concurrent operations, they may be able to cause memory corruption or object state manipulation that results in privilege elevation. The Win32K subsystem handles critical user interface components including window management, graphics rendering, and input processing, making it a high-value target for exploitation as successful exploitation can provide full system control. This vulnerability is particularly concerning because it requires minimal privileges to exploit since the attacker only needs local access to the system, yet can achieve SYSTEM-level privileges through the improper synchronization of kernel resources.
From an operational perspective, this race condition allows attackers who have already established a foothold on a target system to perform privilege escalation without requiring additional attack vectors or elevated privileges. The exploitation typically involves creating multiple threads that race to manipulate shared kernel objects in a way that causes memory corruption or state inconsistencies which can be leveraged to execute arbitrary code with system-level privileges. This vulnerability impacts all versions of windows where the Win32K subsystem is present and can be exploited through legitimate user sessions, making it particularly dangerous for environments with multiple users or where local access is possible through various attack vectors such as phishing, physical access, or other initial compromise methods. The exploitation process often requires careful timing and knowledge of the specific kernel object manipulation patterns to successfully exploit the race condition.
Mitigation strategies for this vulnerability should focus on both immediate patching and defensive measures within the operating system environment. Microsoft has released security updates that address the synchronization issues in Win32K, and organizations should ensure all systems are updated with the latest patches. Additionally, implementing proper access controls and limiting local user privileges can reduce the impact of successful exploitation attempts. Security monitoring should include detection of unusual kernel-level activity patterns that might indicate race condition exploitation attempts, as well as regular vulnerability assessments focusing on kernel-mode components. The implementation of exploit protection mechanisms such as control flow integrity, address space layout randomization, and kernel-mode code integrity checks can provide additional layers of defense against this type of privilege escalation attack. Organizations should also consider implementing least privilege principles for user accounts to minimize the potential impact if an attacker successfully exploits this vulnerability.