An intel-microcode security update has been released for Debian GNU/Linux 9 LTS to update the CPU microcode for some types of Intel CPUs and provides mitigations for security vulnerabilities.

DLA 2718-1: intel-microcode security update

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Debian LTS Advisory DLA-2718-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Utkarsh Gupta
July 23, 2021   https://wiki.debian.org/LTS
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Package : intel-microcode
Version : 3.20210608.2~deb9u2
CVE ID : CVE-2020-24489 CVE-2020-24511 CVE-2020-24512
CVE-2020-24513

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 Debian 9 stretch, these problems have been fixed in version
3.20210608.2~deb9u2.

Please note that one of the processors is not receiving this update
and so the users of 0x906ea processors that don't have Intel Wireless
on-board can use the package from the buster-security, instead.

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 LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://wiki.debian.org/LTS