The most recent Spectre-class flaw targets a component in CPUs called the return stack buffer. Researchers have discovered yet another speculative execution side-channel flaw enabling attackers to ...

"Retbleed" is the name given to a class of speculative-execution vulnerabilities involving return instructions. Mitigations for Retbleed have found their way into the mainline kernel but, as of this ...

Actually it is somewhat surprising. CPU designer often put in "chicken bits" for disabling new microarchitectural features, in case they turn out to be buggy. You can then still sell the CPU instead ...