CVE-2025-54912: 
vulnerability analysis and mitigation

A use-after-free vulnerability in Windows BitLocker (CVE-2025-54912) was discovered and disclosed on September 9, 2025. The vulnerability affects Microsoft Windows systems with BitLocker encryption enabled. This security flaw was identified by Hussein Alrubaye from Microsoft and received a CVSS score of 7.8 (High) (NVD, Hacker News).

The vulnerability is classified as a Use After Free (CWE-416) issue in Windows BitLocker. It received a CVSS v3.1 base score of 7.8 (High) with the following vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. This indicates that the vulnerability requires local access, low attack complexity, low privileges, and no user interaction, while potentially impacting confidentiality, integrity, and availability (NVD).

If successfully exploited, this vulnerability allows an authorized attacker to elevate privileges locally on the affected system. This could potentially give attackers SYSTEM-level access to the compromised machine, compromising the security of BitLocker-encrypted data (NVD, Hacker News).

Microsoft has released a security patch to address this vulnerability as part of their September 2025 Patch Tuesday updates. Security researchers recommend enabling TPM+PIN for pre-boot authentication to enhance BitLocker security and enabling the REVISE mitigation to prevent BitLocker downgrade attacks (Hacker News).

This vulnerability was part of Microsoft's September 2025 Patch Tuesday release, which addressed a total of 80 security flaws. The BitLocker vulnerability was one of several privilege escalation issues fixed in this update, highlighting Microsoft's ongoing efforts to secure their full-disk encryption feature (Hacker News).