CVE-2026-84042

Crun: crun: rootful krun with passt executes container payload as host root

State: Published
Severity: 7.8 High
Published: Sep 10, 2026
Updated: Sep 15, 2026
Reserved: Sep 1, 2026

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

Scores

CVSS	Score	Vector	Source
3.1	7.8 High	CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H	redhat

Weaknesses

CWE-269 Improper Privilege Management

Affected Products

Product	Versions
Red Hat Enterprise Linux 10Red Hat
Red Hat Enterprise Linux 8Red Hat
Red Hat Enterprise Linux 9Red Hat
Red Hat Hardened ImagesRed Hat
Red Hat OpenShift Container Platform 4Red Hat
Red Hat OpenShift Container Platform 4Red Hat
Red Hat OpenShift Container Platform 4Red Hat

References

https://access.redhat.com/security/cve/CVE-2026-84042vdb-entry
RHBZ#2531222issue-tracking
https://github.com/containers/crun/

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