CVE-2026-84042 [HIGH] – A flaw was found in crun. When crun is built with libkrun and a container is started rootf

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