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this post was submitted on 25 Jul 2023
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It wasn't branch prediction alone, it was the cache combined with branch prediction. The problem is that even discarded outcomes fill the cache with data. Those older vulnerabilities also had the problem that the access permissions check was done after the branch prediction. It's probably too expensive to do when it's not even clear yet whether the branch is going to be taken (that's just speculation on my part though).
I see what you did there, even if you didn't :)