I've got a Macbook Pro from 2011 with BCM4331. So there must be a metric f ton of hardware affected. The firmware is embedded in the closed source drivers, it'

I've got a Macbook Pro from 2011 with BCM4331. So there must be a metric f ton of hardware affected. The firmware is embedded in the closed source drivers, it's not available separately. It's uncertain how far back Broadcom will update their driver packages. On Linux if you want to use the open source driver, either the distro or user must extract the firmware from the closed source driver using b43-fwcutter. I don't know what the license restrictions are that apply to distros that appear to include it in the base installs, and therefore probably get updated. But distros like Fedora don't include it due to license restrictions. Therefore it won't get updated automatically. I think the kernel driver should warn, if not refuse to use without a force option, on firmware versions below a certain value.