A use after free vulnerability in Windows BitLocker allows an authenticated local attacker to elevate privileges, posing a significant risk to system integrity.

This vulnerability is a use after free flaw (CWE-416) within the Windows BitLocker component. It requires the attacker to have local access and low-level privileges to trigger the condition and elevate their standing on the host.

Successful exploitation of this vulnerability allows an attacker to gain elevated privileges on a compromised machine, potentially leading to full system control. With a CVSS score of 7.8, this flaw represents a high-severity risk that could facilitate unauthorized data access or the installation of persistent malicious software.

Immediate Action: Apply the relevant security updates provided by Microsoft as detailed in the official security update guide to patch the BitLocker component.

Proactive Monitoring: Monitor system logs for unusual process execution patterns or unexpected privilege escalation attempts associated with local user accounts.

Compensating Controls: Ensure that strict local access controls are enforced and that the principle of least privilege is maintained to limit the number of users capable of interacting with sensitive system components.

Public Exploit Available: Unknown.

Given the potential for privilege escalation and the high CVSS rating, administrators should prioritize the deployment of the September 2025 security updates to all affected Windows endpoints. Ensuring that systems are patched quickly will effectively neutralize the risk of local attackers gaining unauthorized administrative control over corporate assets.