CVEvulnerability

CVE-2026-34177

9.1 CRITICAL Published 2026-04-09 Modified 2026-10-26 Official page ↗
Status
Analyzed
Published
2026-04-09
Last modified
2026-10-26
Assigner
[email protected]
CVSS 3.1 ([email protected])
9.1 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Weaknesses
CWE-184

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 configurations

• canonical lxd (>= 4.12 <= 5.0.6) • canonical lxd (>= 5.21.0 <= 5.21.4) • canonical lxd (>= 6.0 <= 6.7)

Related

Weakness · CWE (1)

  • CWE-184 Incomplete List of Disallowed Inputs weakness

References