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VMScape: Cracking VM-Host Isolation in the Speculative Execution Age & How Linux Patches Respond

Posted by bob on
Linux Journal; By George Whittaker
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In the world of modern CPUs, speculative execution, where a processor guesses ahead on branches and executes instructions before the actual code path is confirmed, has long been recognized as a performance booster. However, it has also given rise to a class of vulnerabilities collectively known as “Spectre” attacks, where microarchitectural side states (such as the branch target buffer, caches, or predictor state) are mis-exploited to leak sensitive data.

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