We all know about meltdown and spectre, and for the sake of coherence with the rest of this page, I will refrain from using infographics to describe these serious issues in a fullharty and fearmongering way. Unlike other, there is no attempt here to make your feeble rat brain sell off all of your AMD stock.
Should I panic like an idiot?
I don't know. Maybe. I mean it's your life, but I'll go ahead and point you towards people who actually know how to release information about a vulnerability instead of capitalizing on instant fame. There is this concept that is common enough to have a wikipedia page that you can look at called responsible disclosure... really neat stuff, but not as neat as infographics!!