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Just about every Windows and Linux device vulnerable to new LogoFAIL firmware attack
(arstechnica.com)
This is a most excellent place for technology news and articles.
There are more OS' on PC then Windows and Linux. So they should really just say PCs running UEFI. Any PC running a different firmware like core boot or libreboot is not affected. Apple devices are not vulnerable because they don't use UEFI. Apple doesn't do the U(nified) bit and built their own EFI.
What's the market share of these? Are they even relevant?
Depends, definitely not in the consumer market. But coreboot is widely used in appliances. Have a look at the boards from pcengines.
No. He just wants to be over technical.