CVE-2026-85526

Name	CVE-2026-85526
Description	Path traversal in the Btrfs storage driver (unpackVolume) in Canonical LXD on Linux allows an authenticated user with instance creation privileges to delete or replace arbitrary files and directories on the host filesystem as root via a crafted subvolumes[].path entry in backup/optimized_header.yaml during a btrfs optimized backup import.
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-6027-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
incus (PTS)	trixie	6.0.4-2+deb13u10	fixed
	trixie (security)	6.0.4-2+deb13u11	fixed
	forky	7.0.1-5	fixed
	sid	7.0.1-6	fixed
lxd (PTS)	bookworm, bookworm (security)	5.0.2-5+deb12u6	vulnerable
	trixie (security), trixie	5.0.2+git20231211.1364ae4-9+deb13u7	vulnerable

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

Package	Type	Release	Fixed Version	Urgency	Origin
incus	source	trixie	6.0.4-2+deb13u1		DSA-6027-1
incus	source	(unstable)	7.0.1-5
lxd	source	bookworm	(unfixed)	end-of-life
lxd	source	(unstable)	(unfixed)

[bookworm] - lxd <end-of-life> (EOL in bookworm LTS)
https://github.com/canonical/lxd/security/advisories/GHSA-h85r-gjgx-g2rv