The microcode updates that people have been mentioning are not updates to your motherboard's firmware, EFI or otherwise. They are updates to the code that runs inside your central processor chip, the so-called microcode, that does the work of understanding and enacting processor instructions (in all programs, from the programs in your firmware to the programs that you download and run from the WWW).
Firmware updates are largely irrelevant to this issue, only being involved in the sense that one way to perform microcode updates is for your machine's firmware to upload the new microcode image file. But that is just one way for that to be done; your operating system can do it, too.
Firmware updates are largely irrelevant to this issue, only being involved in the sense that one way to perform microcode updates is for your machine's firmware to upload the new microcode image file. But that is just one way for that to be done; your operating system can do it, too.
* http://inertiawar.com/microcode/
* https://news.ycombinator.com/item?id=16081366
* https://newsroom.intel.com/wp-content/uploads/sites/11/2018/... (https://news.ycombinator.com/item?id=16079910)