"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 ...
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 ...
Some knowledgeable people already say that: Retpoline is not safe on Skylake-era CPUs, and we knew this before the Spectre/Meltdown embargo broke in Jan '18.
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