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For computers that are already infected, likely the only fix is to take the computer out to the parking lot and back your car over it. For 99% of people it is going to be too hard and too costly to fix.
The bug, which as the title says, has been around for a while, allows a hacker to bypass protections of the System Management Mode (SMM). The SMM is kind of the computer inside the computer that manages, among other things, the overall security of the system. That is why a compromise to it is likely unfixable.
Also, since the bug has been around for nearly two decades, most of the affected CPUs are well past the end of support life.
For you geeks reading this and who understand the x86 architecture, this allows a hacker to jump from ring 0 (kernel) to ring -2 (did you even know there was a ring -2?).
AMD has released sub-optimal (I could use a different phrase but if I did, your HR department might pay you a visit) fix which is deployed as part of the boot process every time the computer boots. Assuming malware does not block it.
AMD CPUs are also used in a lot of embedded systems such as in critical infrastructure. Likely most of those critical infrastructure systems will likely be vulnerable for decades.
If you want help sorting this out, please contact us. Credit: CSO Online