VM lowlevel restriction bypass via raw.apparmor and raw.qemu.conf (Canonical lxd)
At a glance
- Source
- NVD
- EPSS
- EPSS 0.36 % · percentile 30 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- canonical
- NVD status
- Analyzed
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.
Weaknesses (CWE)
- CWE-184 — Incomplete List of Disallowed Inputs
References
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | CRITICAL 9.1 | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H | canonical |
| CVSS 3.1 | CRITICAL 9.1 | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H | NVD · security@ubuntu.com (Secondary) |
Advisories
- GHSA-fm2x-c5qw-4h6f — LXD: VM lowlevel restriction bypass via raw.apparmor and raw.qemu.conf
- GO-2026-5368 — VM lowlevel restriction bypass via raw.apparmor and raw.qemu.conf in github.com/canonical/lxd
European references
- ENISA EUVD · EUVD-2026-20872
- GCVE · GCVE-0-2026-34177
Affected configurations (NVD CPE)
cpe:2.3:a:canonical:lxd:*:*:*:*:*:*:*:*≥ 4.12 ≤ 5.0.6cpe:2.3:a:canonical:lxd:*:*:*:*:*:*:*:*≥ 5.21.0 ≤ 5.21.4cpe:2.3:a:canonical:lxd:*:*:*:*:*:*:*:*≥ 6.0 ≤ 6.7
Affected products
| Product | Versions |
|---|---|
| Canonical · lxd | affected 4.12.0 < 5.0.7 ; affected 5.1.0 < 5.21.5 ; affected 6.0.0 < 6.8.0 |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |