Any operating system that supports a usb keyboard is vulnerable. In theory maybe you could limit the vulnerability by blocking all but one keyboard but I don't know of anything that does that
this post was submitted on 26 Nov 2023
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Pretty much this.
They behave like standard HID devices unless they're scripted to emulate something else, like say a network interface... not really a feasible thing to fullt mitigate, and probably not worth worrying about IMO unless you're a bank or something
Any OS is resistant if you disable the usb ports but other than that there is not much you can do. Just dont plug in random cables or usb sticks into your computer
Are you asking this in a theoretical, "just for fun" sort of way? If so, any OS that is too old to support USB would be resistant, such as AmigaOS. Otherwise, there really isn't anything you can do to protect against those types of devices short of completely disabling USB altogether.
just for fun
If you are on a unix machine you should be able to use duckhunt. When it detects a keyboard typing too fast it logs it and blocks the keyboard until either the attack is over or you input a password, depending on the settings; i'm not sure if that is the original repo though