A containerd security update has been released for Debian GNU/Linux 11.

DSA 5002-1: containerd security update

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Debian Security Advisory DSA-5002-1 security@debian.org
  https://www.debian.org/security/ Salvatore Bonaccorso
November 06, 2021   https://www.debian.org/security/faq
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Package : containerd
CVE ID : CVE-2021-41103

A flaw was discovered in containerd, an open and reliable container
runtime. Insufficiently restricted permissions on container root and
plugin directories could result in privilege escalation.

For the stable distribution (bullseye), this problem has been fixed in
version 1.4.5~ds1-2+deb11u1.

We recommend that you upgrade your containerd packages.

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

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/