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Encryption-breaking, password-leaking bug in many AMD CPUs could take months to fix
(arstechnica.com)
This is a most excellent place for technology news and articles.
Intel had something like this as well (side channel attack?). I remember it because Linus Torvalds (creator of Linux kernel) ripped Intel a new one.
They've had a couple. Spectre is the one to which you're referring, I bet.