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CVE-2026-34177

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CVE-2026-34177

Published: Apr 9, 2026

Modified: Apr 9, 2026

PUBLISHED

CVSS v3.1

9.1

CRITICAL

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.

VendorProductVersions

Canonical

lxd

affected
4.12.0 - < 5.0.7
affected
5.1.0 - < 5.21.5
affected
6.0.0 - < 6.8.0

Weaknesses (CWE)

CWE-184

CVSS v3.1 Details

CVSS v3.1 Vector

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

References

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