The Zenbleed exploit was announced about a week ago, however the Register wrongly and dangerously claims that it doesn't affect QEMU or "any form of emulation".

We were able to run the exploit inside of a Firecracker VM with KVM, and of course Docker, K8s etc has the same set of issues.

Short story - if you're running an AMD CPU, check the exploit (it's very quick) and update your OS.