7.8 High

CVE-2026-84042 Crun: crun: rootful krun with passt executes container payload as host root

Description

A flaw was found in crun. When crun is built with libkrun and a container is started rootful with passt networking (krun.use_passt), crun can execute attacker-controlled payload from the container image with host root privileges. The issue is a regression in crun 1.29. It affects crun >= 1.29

CVSS 3.1 detail

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

Exploitable with local access to the machine, with an ordinary account and without any user action; an attacker can seriously compromise confidentiality, integrity or availability.

Attack vector: Local
Attack complexity: High
Privileges required: Low
Interaction: None
Scope: Changed
Confidentiality: High
Integrity: High
Availability: High

Affected products and versions

Product	Affected versions	Fixed in
Red Hat Hardened Images	Versions not published
Red Hat Enterprise Linux 10	Versions not published
Red Hat Enterprise Linux 8	Versions not published
Red Hat Enterprise Linux 9	Versions not published
Red Hat OpenShift Container Platform 4	Versions not published
Red Hat OpenShift Container Platform 5	Versions not published

References

access.redhat.com access.redhat.com
RHBZ#2531222 bugzilla.redhat.com
github.com github.com

Timeline

Published September 10, 2026
Last modified November 4, 2026

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