TechPowerUp writes it doesn't appear to be a software bug but an issue with Intel's Ice Lake architecture. At the moment, there's no response from Intel but chips with the latest microcode update are vulnerable to this. It looks pretty grave as this bug could potentially be used to compromise systems. Based on the bug reports, this is a chip-level bug that breaks virtual machine isolation.
It seems like the IntelliJ IDE has a specific sequence of instructions that trigger Ice Lake CPUs to crash OS. This behavior is concerning as this could be used for a possible exploit. Again, cloud providers are at risk here as if you crash the system the whole instance could crash. Of course server Ice Lake parts are yet to arrive, but the bug could be hidden in the core of the CPU design.