CVE-2026-49808 in Windows
Summary
by MITRE • 07/14/2026
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Kernel 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 within the windows kernel's handling of shared resources during concurrent execution scenarios. The issue manifests when multiple threads or processes attempt to access and modify the same kernel object or memory location without proper synchronization mechanisms in place. The fundamental technical flaw lies in the absence of adequate locking primitives or atomic operations that would normally prevent simultaneous access to critical kernel structures. When an authorized local user exploits this condition, they can manipulate the timing of concurrent operations to achieve privilege escalation from standard user level to system level privileges.
The operational impact of this vulnerability is significant as it transforms a user-level account into a system-level privileged entity without requiring external attack vectors or complex exploitation techniques. Attackers can leverage this race condition by carefully orchestrating multiple concurrent threads that attempt to manipulate kernel objects such as process handles, memory management structures, or security descriptors. The flaw essentially allows an attacker to corrupt kernel data structures or manipulate access control lists at the moment when synchronization checks should prevent such modifications, ultimately leading to unauthorized privilege elevation.
This vulnerability directly maps to CWE-362 which specifically addresses race conditions in concurrent programming scenarios where improper synchronization leads to security flaws. From an ATT&CK framework perspective, this represents a local privilege escalation technique categorized under T1068 with potential for lateral movement once system-level access is achieved. The attack vector requires local system access and leverages the inherent concurrency model of the windows kernel where multiple threads may operate simultaneously on shared resources without proper mutual exclusion mechanisms.
The mitigation strategies should focus on implementing proper synchronization primitives within kernel code paths that handle shared resources, including mutexes, semaphores, or atomic operations to prevent concurrent access to critical sections. Microsoft typically addresses such vulnerabilities through kernel-mode patching and implementation of additional validation checks during resource manipulation operations. System administrators should ensure timely application of security updates, as these types of kernel-level race conditions are often remediated through official microsoft security patches that strengthen synchronization mechanisms in affected kernel components.
The broader implications for system security highlight the critical importance of proper concurrent programming practices within operating system kernels, where even authorized users with legitimate access can exploit implementation flaws to gain unauthorized elevated privileges. This vulnerability underscores the necessity of rigorous code review processes focusing on concurrency control and proper resource management in privileged execution contexts, particularly when dealing with kernel-level operations that affect system security boundaries and user privilege escalation paths.