[Libertus]

https://hothardware.com/news/amd-pro...channel-attack

The researcher paper (PDF) goes into a lot more detail for anyone who cares to parse the data for themselves. In addition, Gruss answered a question on Twitter about the comparative severity of these techniques in relation to Meltdown and ZombieLoad, saying they are "certainly not" in the same league, as those exploits "leak tons of actual data."

https://www.amd.com/en/corporate/product-security

AMD believes these are not new speculation-based attacks.