[…]Here are five of the most serious that were reported in the past year.
1. Spectre, Meltdown variants post triple threat
2. Researchers find flaws related to Speculative Store Bypass
3. Intel acknowledges flaws in ME, AMT subsystems
4. When 140 years is not long enough: the ROCA flaw
5. Insensitive disclosure of sensitive issues: AMD PSP flaws

http://www.eweek.com/security/processor-flaws-force-chip-producers-to-make-security-top-priority