A runc security update has been released for Debian GNU/Linux 9 LTS.

DLA 2841-1: runc security update

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Debian LTS Advisory DLA-2841-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Chris Lamb
December 06, 2021   https://wiki.debian.org/LTS
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Package : runc
Version : 0.1.1+dfsg1-2+deb9u3
CVE ID : CVE-2021-43784

It was discovered that there was an overflow issue in runc, the
runtime for the Open Container Project, often used with Docker.

The Netlink 'bytemsg' length field could have allowed an attacker to
override Netlink-based container configurations. This vulnerability
required the attacker to have some control over the configuration of
the container, but would have allowed the attacker to bypass the
namespace restrictions of the container by simply adding their own
Netlink payload which disables all namespaces.

For Debian 9 "Stretch", this problem has been fixed in version
0.1.1+dfsg1-2+deb9u3.

We recommend that you upgrade your runc packages.

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

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