CVE-2026-34178

Name	CVE-2026-34178
Description	In Canonical LXD before 6.8, the backup import path validates project restrictions against backup/index.yaml in the supplied tar archive but creates the instance from backup/container/backup.yaml, a separate file in the same archive that is never checked against project restrictions. An authenticated remote attacker with instance-creation permission in a restricted project can craft a backup archive where backup.yaml carries restricted settings such as security.privileged=true or raw.lxc directives, bypassing all project restriction enforcement and allowing full host compromise.
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)
References	DSA-6212-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
incus (PTS)	trixie	6.0.4-2+deb13u4	vulnerable
	trixie (security)	6.0.4-2+deb13u6	fixed
	forky, sid	6.0.6-3	fixed
lxd (PTS)	bookworm	5.0.2-5+deb12u2	vulnerable
	bookworm (security)	5.0.2-5+deb12u5	vulnerable
	trixie	5.0.2+git20231211.1364ae4-9+deb13u3	vulnerable
	trixie (security)	5.0.2+git20231211.1364ae4-9+deb13u5	fixed

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

Package	Type	Release	Fixed Version	Origin
incus	source	trixie	6.0.4-2+deb13u6	DSA-6212-1
incus	source	(unstable)	6.0.6-3
lxd	source	trixie	5.0.2+git20231211.1364ae4-9+deb13u5
lxd	source	(unstable)	(unfixed)

Notes

https://github.com/canonical/lxd/security/advisories/GHSA-q96j-3fmm-7fv4
https://github.com/canonical/lxd/pull/17921
https://github.com/lxc/incus/pull/3088