CVE-2026-23671 in Windows
Summary
by MITRE • 03/10/2026
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Bluetooth RFCOM Protocol Driver allows an authorized attacker to elevate privileges locally.
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Analysis
by VulDB Data Team • 03/13/2026
The vulnerability identified as CVE-2026-23671 represents a critical race condition flaw within the Windows Bluetooth RFCOM Protocol Driver component that enables local privilege escalation. This issue manifests through concurrent execution patterns where multiple threads or processes attempt to access shared resources without proper synchronization mechanisms, creating opportunities for malicious exploitation. The flaw exists specifically within the Bluetooth RFCOM protocol implementation that handles serial communication over Bluetooth connections, making it particularly concerning for systems with active Bluetooth functionality. The vulnerability is classified as a race condition under CWE-362, which describes the condition where two or more threads or processes access shared resources concurrently and the outcome depends on the timing or order of execution. The improper synchronization mechanism in the Bluetooth RFCOM driver allows an authenticated local attacker to manipulate the system state during concurrent operations, potentially leading to unauthorized privilege elevation.
The technical exploitation of this vulnerability occurs when an attacker leverages the race condition to manipulate shared kernel resources during Bluetooth RFCOM operations. The flaw typically involves scenarios where the driver performs operations on shared data structures or memory regions without adequate locking mechanisms or atomic operations. During concurrent execution, the attacker can time their malicious actions to exploit the window of vulnerability where resource access is not properly synchronized, allowing them to inject malicious code or manipulate system state. The RFCOM protocol driver handles Bluetooth serial port emulation, which means that the vulnerability can be triggered through legitimate Bluetooth communication channels while maintaining the appearance of normal system behavior. This makes detection particularly challenging as the malicious activity can blend seamlessly with legitimate Bluetooth operations and network traffic patterns.
The operational impact of this vulnerability extends beyond simple privilege escalation, potentially enabling attackers to gain SYSTEM level privileges on affected Windows systems. Local attackers with standard user accounts can exploit this flaw to elevate their privileges, effectively bypassing standard security boundaries and gaining unrestricted access to system resources, files, and processes. The vulnerability affects multiple Windows versions including Windows 10, Windows 11, and Windows Server operating systems, making it particularly dangerous in enterprise environments where Bluetooth functionality is commonly enabled. The implications are severe as attackers can leverage this privilege escalation to install persistent backdoors, modify system configurations, access sensitive data, or establish footholds for further lateral movement within the network. This vulnerability aligns with ATT&CK technique T1068 which describes the use of local privilege escalation to gain SYSTEM-level access, and T1547 which covers the abuse of system services for persistence and privilege escalation.
Mitigation strategies for CVE-2026-23671 should prioritize immediate patch deployment from Microsoft, as the vendor has released security updates addressing the race condition in the Bluetooth RFCOM driver. Organizations should implement comprehensive patch management processes to ensure all affected systems receive updates promptly, particularly in environments where Bluetooth functionality is actively used. Network administrators should consider disabling Bluetooth functionality on systems where it is not required, reducing the attack surface for this particular vulnerability. Additional defensive measures include implementing strict access controls and monitoring for unusual Bluetooth-related system activity that might indicate exploitation attempts. The vulnerability demonstrates the importance of proper synchronization mechanisms in kernel-level drivers, emphasizing the need for rigorous code review processes that include security testing for concurrent execution patterns. Organizations should also consider implementing endpoint detection and response solutions that can monitor for suspicious privilege escalation patterns and unusual Bluetooth protocol behavior that might indicate exploitation attempts. Given the nature of the vulnerability, regular security assessments of kernel components and driver implementations should be conducted to identify similar race condition flaws that could present analogous security risks.