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Speculative execution is a technique used by processors to improve performance.
If the guess is correct, it speeds up processing; if not, the incorrect results are discarded.
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Those interested in technical details can read the in-depth analysishere.
These are the same researchers that discovered the iLeakage vulnerability a year and a half ago,BleepingComputerreminds.
That one, too, was a side-channel flaw.