Debian 9819 Published by

A runc security update has been released for Debian GNU/Linux 10 LTS to address multiple vulnerabilities that can be abused by malicious Docker images or OCI bundles.

DLA 3369-1: runc security update

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Debian LTS Advisory DLA-3369-1 Sylvain Beucler
March 27, 2023
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Package : runc
Version : 1.0.0~rc6+dfsg1-3+deb10u2
CVE ID : CVE-2019-16884 CVE-2019-19921 CVE-2021-30465 CVE-2022-29162
Debian Bug : 942026 988768

Multiple vulnerabilities were discovered in runc, the Open Container
Project runtime, which is often used with virtualization environments
such as Docker. Malicious Docker images or OCI bundles could breach


runc, as used in Docker and other products, allows AppArmor and
SELinux restriction bypass because libcontainer/rootfs_linux.go
incorrectly checks mount targets, and thus a malicious Docker
image can mount over a /proc directory.


runc has Incorrect Access Control leading to Escalation of
Privileges, related to libcontainer/rootfs_linux.go. To exploit
this, an attacker must be able to spawn two containers with custom
volume-mount configurations, and be able to run custom
images. (This vulnerability does not affect Docker due to an
implementation detail that happens to block the attack.)


runc allows a Container Filesystem Breakout via Directory
Traversal. To exploit the vulnerability, an attacker must be able
to create multiple containers with a fairly specific mount
configuration. The problem occurs via a symlink-exchange attack
that relies on a race condition.


`runc exec --cap` created processes with non-empty inheritable
Linux process capabilities, creating an atypical Linux environment
and enabling programs with inheritable file capabilities to
elevate those capabilities to the permitted set during
execve(2). This bug did not affect the container security sandbox
as the inheritable set never contained more capabilities than were
included in the container's bounding set.


CVE-2019-19921 was re-introduced by the fix for CVE-2021-30465.

For Debian 10 buster, this problem has been fixed in version

We recommend that you upgrade your runc packages.

For the detailed security status of runc please refer to
its security tracker page at:

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: