Two new Spectre/Meltdown variants – known as 3a and 4 – have been discovered. Chipmakers Intel, AMD, ARM and IBM – for its Power CPUs – have all confirmed that some of their CPUs are vulnerable to the two newly disclosed variants. The chipmakers have been furiously shipping microcode updates and working with operating system makers to put firmware and software fixes in place to help block attempts to exploit the flaws. Intel says the risk posed by variant 4 is low, thanks to fixes that have been put in place since the first three were discovered.”]
Source: https://www.govinfosecurity.com/spectre-meltdown-flaws-two-more-variants-discovered-a-11021