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This is a bug in a student-built microarchitecture, not an issue with the ISA.

Not a great article, as it attacks RISC-V for no good reason.

They had a pun, they wanted to use it.

Yeah looks like bugs in riscv-boom rather than the RISC-V ISA itself

In particular this is a timing attack like Spectre/Meltdown - looks like there are timing issues with allocation of write port slots when writing to the register file - because division takes so long it's possible to use a late write from division to tell whether a particular speculative branch has been taken or not

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