DSA-4934-1 intel-microcode -- security update

Debian Security Advisory

DSA-4934-1 intel-microcode -- security update

Date Reported:

26 Jun 2021

Affected Packages:

intel-microcode

Vulnerable:

Yes

Security database references:

In Mitre's CVE dictionary: CVE-2020-24489, CVE-2020-24511, CVE-2020-24512, CVE-2020-24513.

More information:

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and some for Skylake R0/D0 CPUs on systems using a very outdated firmware/BIOS, the system may hang on boot: (https://github.com/intel/Intel-Linux-Processor-Microcode-Data-Files/issues/31)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/-/blob/master/debian/README.Debian)

We recommend that you upgrade your intel-microcode packages.

For the detailed security status of intel-microcode please refer to its security tracker page at: https://security-tracker.debian.org/tracker/intel-microcode