[compiler-guy]

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.

[rightbyte]

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?

[rurban]

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