If you buy crappy USB devices that have internal firmware re-write
capability for no reason then yes, or if you let random people plug
devices in to your "trusted" usb controller (most boards have two)
I would suggest only buying USB devices where the firmware can only be
re-written externally not internally from the computer.
Unicomp's high quality mechanical keyboards (they are also made in
america not china so they are trustworthy) come with write-locked ROM
firmware as there is no reason to have re-writable firmware on a keyboard.
I am not sure what to buy for a mouse however but unicomp makes a
keyboard with a trackball and another with a pointing stick similar to a
laptop keyboard.
If you purchase a motherboard with libre firmware (not purism) such as
the KCMA-D8 or the (blobs for video and power unfortunately, so open
source but not libre) lenovo g505s laptop you can easily verify that the
firmware has not been fucked around with via a usb attack such as the
intel skylake debug controller exploit.
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