The release notes say
The intel-microcode package currently in bullseye and buster-security (see DSA-4934-1 (https: //www.debian.org/security/2021/dsa-4934)) is known to contain two significant bugs. For some CoffeeLake CPUs this update may break network interfaces (https://github.com/intel/ Intel-Linux-Processor-Microcode-Data-Files/issues/56) that use firmware-iwlwifi, and for some Skylake R0/D0 CPUs on systems using a very outdated firmware/BIOS, the system may hang on boot (https://github.com/intel/Intel-Linux-Processor-Microcode-Data-Files/issues/31).
I have no idea whether my old processor is a "CoffeeLake" or a "Skylake" or something else. It is a pc that I bought in 2008, I think (and still working just fine).
/proc/cpuinfo says:
vendor_id : GenuineIntel cpu family : 6 model : 23 model name : Intel(R) Core(TM)2 Duo CPU E8400 @ 3.00GHz
Do I need to worry about those microcode bugs? Thanks, Jesper Dybdal -- Jesper Dybdal https://www.dybdal.dk