Researchers from the Fraunhofer Institute for Applied and Integrated Safety in Munich, Germany have published a paper detailing a method of recovering data that is normally encrypted by AMD’s Secure Encrypted Virtualization (SEV) The research team says their attack, which they named SEVered, is capable of recovering plaintext memory data from guest VMs running on the same server as the VM that’s under attack. The attack is successful because the VM stores some of its data inside the main RAM memory, and the encryption of main memory lacks integrity protection.
Source: https://www.bleepingcomputer.com/news/security/researchers-bypass-amd-s-sev-virtual-machine-encryption/