On first glance it looks like many CPUs are vulnerable to same-privilege mis-speculation leaks (e.g. in JIT engines - disable eBPF jit if you have it enabled), but Intel has the real SNAFU in letting it leak across privilege modes.
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Apparently there is an "official" website now https://meltdownattack.com - which says the kernel leak (Meltdown) has only been verified on Intel but the user-to-user leak (Spectre) has been verified on Intel, AMD and ARM
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