CVE-2026-34177

CriticalCVSS 9.1/10Last modified Oct 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.

Metrics

CVSS 3.1 9.1/10CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Weakness enumeration

CWE-184

Affected software

VendorProductVersions
Canonicallxd>= 4.12.0, < 5.0.7; >= 5.1.0, < 5.21.5; >= 6.0.0, < 6.8.0

References

Timeline

Published
Apr 9, 2026
Last modified
Oct 26, 2026
NVD status
Analyzed

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