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Improper Preservation of Permissions The advisory has been revoked - it doesn't affect any version of package containerd  (opens in a new tab)

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EPSS
1.68% (75th percentile)

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  • Snyk IDSNYK-UBUNTU1604-CONTAINERD-2331173
  • published1 Jun 2025
  • disclosed5 Jan 2022
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Introduced: 5 Jan 2022

CVE-2021-43816  (opens in a new tab)
CWE-281  (opens in a new tab)

Amendment

The Ubuntu security team deemed this advisory irrelevant for Ubuntu:16.04.

NVD Description

Note: Versions mentioned in the description apply only to the upstream containerd package and not the containerd package as distributed by Ubuntu.

containerd is an open source container runtime. On installations using SELinux, such as EL8 (CentOS, RHEL), Fedora, or SUSE MicroOS, with containerd since v1.5.0-beta.0 as the backing container runtime interface (CRI), an unprivileged pod scheduled to the node may bind mount, via hostPath volume, any privileged, regular file on disk for complete read/write access (sans delete). Such is achieved by placing the in-container location of the hostPath volume mount at either /etc/hosts, /etc/hostname, or /etc/resolv.conf. These locations are being relabeled indiscriminately to match the container process-label which effectively elevates permissions for savvy containers that would not normally be able to access privileged host files. This issue has been resolved in version 1.5.9. Users are advised to upgrade as soon as possible.

References