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5.1.20 Intel CPU microcode issues 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that use firmware-iwlwifi, and for some Skylake R0/D0 CPUs on systems using a very outdated firmware/BIOS, the system may hang on boot (https://github.com/intel/Intel-Linux-Processor-Microcode-Data-Files/ issues/31). If you held back the update from DSA-4934-1 due to either of these issues, or do not have the security archive enabled, be aware that upgrading to the intel-microcode package in bullseye may cause your system to hang on boot or break iwlwifi. In that case, you can recover by disabling microcode loading on boot; see the instructions in the DSA, which are also in the intel-microcode README.Debian.