CVE-2026-84042

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

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

References

• https://access.redhat.com/security/cve/CVE-2026-84042 ↗
• https://bugzilla.redhat.com/show_bug.cgi?id=2531222 ↗
• https://github.com/containers/crun/ ↗