An intel-microcode security update has been released for Debian GNU/Linux 10 and 11 to update the CPU microcode for some types of Intel CPUs and provides mitigations for security vulnerabilities.

DSA 5178-1: intel-microcode security update

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Debian Security Advisory DSA-5178-1 security@debian.org
  https://www.debian.org/security/ Salvatore Bonaccorso
July 06, 2022   https://www.debian.org/security/faq
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Package : intel-microcode
CVE ID : CVE-2022-21123 CVE-2022-21125 CVE-2022-21127 CVE-2022-21151
CVE-2022-21166
Debian Bug : 1010947

This update ships updated CPU microcode for some types of Intel CPUs and
provides mitigations for security vulnerabilities.

CVE-2022-21123, CVE-2022-21125, CVE-2022-21127, CVE-2022-21166

Various researchers discovered flaws in Intel processors,
collectively referred to as MMIO Stale Data vulnerabilities, which
may result in information leak to local users.

For details please refer to
  https://www.intel.com/content/www/us/en/developer/articles/technical/software-security-guidance/technical-documentation/processor-mmio-stale-data-vulnerabilities.html

CVE-2022-21151

Alysa Milburn, Jason Brandt, Avishai Redelman and Nir Lavi
discovered that for some Intel processors optimization removal or
modification of security-critical code may result in information
disclosure to local users.

For the oldstable distribution (buster), these problems have been fixed
in version 3.20220510.1~deb10u1.

For the stable distribution (bullseye), these problems have been fixed in
version 3.20220510.1~deb11u1.

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

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://www.debian.org/security/