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Vulnerability record · CVE-2021-43816 · published 5 January 2022

CVE-2021-43816: Linuxfoundation containerd vulnerability

Linuxfoundation · Containerd

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.

9.1 CVSS 3.1 Critical EPSS 1.7% · top 24.0% CWE-281 · CWE-281
9.1CVSS 3.1 base score, v2 6.0
1.7%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
12References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/containerd/containerd/commit/a731039238c62be081eb8c31525b988415745eea PatchThird Party Advisory
https://github.com/containerd/containerd/issues/6194 ExploitIssue TrackingThird Party Advisory
https://github.com/containerd/containerd/security/advisories/GHSA-mvff-h3cj-wj9c Third Party Advisory
https://github.com/dweomer/containerd/commit/f7f08f0e34fb97392b0d382e58916d6865100299 PatchThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GD5GH7NMK5VJMA2Y5CYB5O5
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MPDIZMI7ZPERSZE2XO265UC
https://github.com/containerd/containerd/commit/a731039238c62be081eb8c31525b988415745eea PatchThird Party Advisory
https://github.com/containerd/containerd/issues/6194 ExploitIssue TrackingThird Party Advisory
https://github.com/containerd/containerd/security/advisories/GHSA-mvff-h3cj-wj9c Third Party Advisory
https://github.com/dweomer/containerd/commit/f7f08f0e34fb97392b0d382e58916d6865100299 PatchThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GD5GH7NMK5VJMA2Y5CYB5O5
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MPDIZMI7ZPERSZE2XO265UC

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Source: NIST National Vulnerability Database (record CVE-2021-43816), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.