Ubuntu: DSA-4945-2 Urgent: AMD Microcode Enhancement Resolved

This update ships updated CPU microcode for some types of Intel CPUs and
provides mitigations for security vulnerabilities which could result in
privilege escalation in combination with VT-d and various side channel
attacks.

For the stable distribution (buster), these problems have been fixed in
version 3.20210608.2~deb10u1.

Note that there are two reported regressions; for some CoffeeLake CPUs
this update may break iwlwifi
(https://github.com/intel/Intel-Linux-Processor-Microcode-Data-Files/issues/56)
and some for Skylake R0/D0 CPUs on systems using a very outdated firmware/BIOS,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 are affected by those issues, you can recover by disabling microcode
loading on boot (as documented in README.Debian (also available online at
https://salsa.debian.org/hmh/intel-microcode/-/tree/master

We recommend that you upgrade your intel-microcode packages.

For the detailed security status of intel-micr...