Article: Unpatchable vulnerability in Apple chip leaks secret encryption keys | Ars Technica
AFAIK many if not all of modern highly complex CPUs are susceptible to side-channel attacks. The good thing about them is that they usually need highly controlled environments to work, i.e. just the right apps have to run on just the right cores with nothing else interfering so the immediate danger by side-channel attacks is thankfully rather low.
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