"Zenbleed" bug affects all Zen 2-based Ryzen, Threadripper, and EPYC CPUs.
The bug allows attackers to swipe data from a CPU’s registers. […] the exploit doesn’t require physical hardware access and can be triggered by loading JavaScript on a malicious website.
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I’ve been out of the builder world for long enough that I didn’t follow the 2018 bug. I’m more from the F00F generation in any case. I also took a VLSI course somewhere in the mid-90s that convinced me to do anything other than design chips. I seem to remember something else from that era where a firmware based security bug related to something I want to say was browser-based, but it wasn’t the CPU iirc.
In any case, I get the point you and others are making about evaluating the risks of a security flaw before taking steps that might hurt performance or worrying about it too much.