VULNERABILITY INTELLIGENCE

CVE-2026-34177

CVSS score9.1 CRITICAL
EPSS probability0.36%
CISA KEVNot currently listed
Published2026-04-09
Last modified2026-10-26
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

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.

Weakness classification

  • security@ubuntu.com: CWE-184

Primary references