CVE-2025-54105 is a race condition vulnerability classified under CWE-362 affecting the Microsoft Brokering File System in Windows 11 Version 24H2 (build 10.0.26100.0). The vulnerability stems from improper synchronization when multiple threads or processes concurrently access shared resources, leading to a race condition. This flaw can be exploited by an authorized local attacker with low privileges to elevate their privileges on the system. The attacker must execute code locally and leverage the timing window where the Brokering File System fails to properly serialize access, potentially allowing them to execute unauthorized actions or corrupt data. The vulnerability does not require user interaction but has high attack complexity due to the need for precise timing and conditions to trigger the race. The CVSS v3.1 base score is 7.0, indicating high severity, with impacts on confidentiality, integrity, and availability. No public exploits have been reported yet, and no patches are currently linked, suggesting that mitigation relies on vendor updates and defensive controls. This vulnerability highlights the risks of concurrency issues in critical OS components that manage file system brokering and resource sharing.

If exploited, this vulnerability allows an attacker with local access and low privileges to escalate their privileges to higher levels, potentially SYSTEM or administrator. This can lead to full system compromise, unauthorized access to sensitive data, installation of persistent malware, or disruption of system operations. The compromise of confidentiality, integrity, and availability could affect both individual users and enterprise environments. Organizations relying on Windows 11 24H2 for critical infrastructure, enterprise workstations, or sensitive data processing are at risk of significant operational and reputational damage. The high complexity of exploitation limits widespread attacks currently, but targeted attacks against high-value targets are plausible. The absence of known exploits in the wild reduces immediate risk but does not eliminate the threat, especially once exploit code becomes available. The vulnerability could also be chained with other flaws to facilitate broader attacks.

Organizations should monitor Microsoft security advisories closely and apply patches promptly once released for Windows 11 Version 24H2. Until patches are available, restrict local user privileges to the minimum necessary to reduce the attack surface. Employ application whitelisting and endpoint detection and response (EDR) solutions to detect anomalous behavior indicative of privilege escalation attempts. Conduct regular audits of user accounts and permissions to ensure no unnecessary elevated privileges exist. Implement strict network segmentation to limit lateral movement if a local compromise occurs. Additionally, consider deploying virtualization-based security features available in Windows 11 to isolate critical processes. Developers and system architects should review concurrency controls in custom applications to avoid similar race conditions. Finally, maintain comprehensive backups and incident response plans to mitigate potential impacts of exploitation.