CVE-2026-84042

Name	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
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
crun (PTS)	bookworm	1.8.1-1+deb12u1	fixed
	trixie	1.21-1	fixed
	forky, sid	1.28-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
crun	source	(unstable)	(not affected)

- crun <not-affected> (Vulnerable code introduced in 1.29)
https://bugzilla.redhat.com/show_bug.cgi?id=2531222