I don't think there is anything that gives you this guarantee. (Happy to admit I'm wrong if shown relevant spec language.) I think if you run on a HW that is physically capable of ending the universe (including all threads and programs running within :) then UB can trigger that.
It probably would not "make sense", but that's different from if UB allows it. Ad virtual address space: I don't think there's anything that prevents UB from executing system calls, including things like kill().
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