Description
Canonical LXD versions 4.12 through 6.7 contain an incomplete denylist in isVMLowLevelOptionForbidden (lxd/project/limits/permissions.go), which omits raw.apparmor and raw.qemu.conf from the set of keys blocked under the restricted.virtual-machines.lowlevel=block project restriction. A remote attacker with can_edit permission on a VM instance in a restricted project can inject an AppArmor rule and a QEMU chardev configuration that bridges the LXD Unix socket into the guest VM, enabling privilege escalation to LXD cluster administrator and subsequently to host root.
Affected products
canonical: lxd
References3
- github.com/canonical/lxd/pull/17909 Issue Tracking
- github.com/canonical/lxd/security/advisories/GHSA-fm2x-c5qw-4h6f Third Party Advisory
- github.com/canonical/lxd/security/advisories/GHSA-fm2x-c5qw-4h6f Third Party Advisory
Metrics
- CVSS 3.1
-
9.1
CRITICAL
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H - EPSS — exploit probability
- 0% percentile: 31 · as of 12 November 2026
- CWE
- CWE-184
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.