Nearly every AMD CPU since 2017 vulnerable to Inception data-leak attacks
According to the uni team, in order to fully mitigate this threat,"the branch predictor state has to be fully flushed while switching between distrusting contexts." In practice the situation is a bit complex, and this is how we understand it, judging from theYou can install a microcode update from AMD that only protects user processes from other user processes, and virtual machines from other virtual machines, on the same host.
There are IBPB-level protections you can opt for instead, including one for cloud providers that just protects hosts from guests. As we said, Zen 3 and 4 CPUs — this includes Epyc 3 and 4 and Ryzen 5000 and 7000 processors — will need a microcode update because they apparently lack hardware support necessary to flush the entire branch predictor state. AMD has already started rolling out these microcode fixes to system makers to distribute to customers to address the vulnerability. The bad news for sysadmins is that this could mean some downtime to apply the microcode BIOS update.
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