The white paper presents 4 attack vectors:
MasterKey
RyzenFall
Fallout
Chimera
MasterKey requires the ability to alter the BIOS
The other three require administrator privileges to exploit.
Chimera is the most dangerous in my mind as it is a chip / asic level error.
All four will require significant rework of the product line to fix.
Kind of crappy that CTS did not allow AMD the normal courtesy of 90 days notice before releasing the white paper.
VERY crappy. I suspect this could be BS meant to affect stock prices, little or nothing more.