CVE-2026-34177
VM lowlevel restriction bypass via raw.apparmor and raw.qemu.conf
- State
- Published
- Severity
- 9.1 Critical
- Published
- Apr 9, 2026
- Updated
- Apr 9, 2026
- Reserved
- Mar 26, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 9.1 Critical | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H | canonical |
Weaknesses
- CWE-184 Incomplete list of disallowed inputs
Affected Products
| Product | Versions |
|---|---|
lxdCanonical |
|
References
- VM lowlevel restriction bypass via raw.apparmor and raw.qemu.confvdb-entryvendor-advisory
- lxd: Prevent use of raw.apparmor and raw.qemu.conf when low level options are blockedpatchissue-tracking
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