My question is -are these extentions part of the features in newer CPUs that are being exploited like Spectre etc or is it completely unrelated. I ask because i

My question is -are these extentions part of the features in newer CPUs that are being exploited like Spectre etc or is it completely unrelated. I ask because if it is, then it may be a feature (or set of features) that's going to be going away. [edited in hopes of being clearer]