https://bugzilla.redhat.com/show_bug.cgi?id=1251157 This is not a vulnerability in libguestfs, but because we always give a virtio-serial port to each guest (since that is how guest-host communication happens), an escalation from the appliance to the host qemu process is possible. This could affect you if: - your libguestfs program runs untrusted programs out of the guest (eg. using guestfs_sh etc) - another exploit was found in (eg) kernel filesystem code that allowed a malformed filesystem to take over the appliance If you use sVirt to confine qemu, that would thwart some/all attacks. Patching qemu recommended. Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones Read my programming and virtualization blog: http://rwmj.wordpress.com libguestfs lets you edit virtual machines. Supports shell scripting, bindings from many languages. http://libguestfs.org