Skip to content
CVE PROGRAM SOURCE RECORD9.1 Critical

CVE-2026-34177

VM lowlevel restriction bypass via raw.apparmor and raw.qemu.conf

Read JSON ↗CVE.org ↗
Status
Published
Published
Updated
Assigning organization
canonical

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

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Canonical lxd

Default version status: unaffected

  • 4.12.0 to < 5.0.7affected
  • 5.1.0 to < 5.21.5affected
  • 6.0.0 to < 6.8.0affected

References