Windows 11-capable CPUs may be vulnerable to encrypted data corruption

Microsoft has warned that some users may be affected by issues related to its encryption capabilities combined with CPUs with Vector Advanced Encryption Standard (VAES) instructions. This problem may result in “data corruption”. This issue affects Windows 11 and Windows Server 2022.

according to a Published on Microsoft’s website (opens in new tab), services that may be affected include Bitlocker, Microsoft’s full-volume encryption feature. It uses the AES instruction set supported by modern CPUs, specifically Adjusted Codebook Mode with Ciphertext Stealing (AES-XTS) based on AES XEX and AES with Galois/Counter Mode (GCM) (AES-GCM).