A CERT coordination center has published an advisory on LogoFail, but unfortunately, it doesn't tell us much. It confirms that AMI, Insyde, Intel and Phoenix are affected and that Microsoft and Toshiba are not. But the remaining 20 companies are fall in the "unknown" category. One of the unknowns is Lenovo, which has already confirmed that it is affected.
Also, no CVEs.
¯_(ツ)_/¯
@dangoodin I suspect we can count on most affected existing deployed machines never being patched for this. Firmware patches at that level are widely considered to be so risky that they are widely avoided, even for serious problems.