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No. The security concern is attackers reading data they shouldn’t. The article explains how.

“Microarchitectural Data Sampling (MDS) is a group of vulnerabilities that allow an attacker to potentially read sensitive data.”

That is way more serious than stealing cycles.

Ye, but I didn't understand how this was different than Spectre, except with different caches.

Still it's fine with no JS and no shared processor time, right?

Right. If you run no foreign code you are safe.

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