Linux pciback DoS via not rate limited log messages.

ISSUE DESCRIPTION

Xen’s PCI backend drivers in Linux allow a guest with assigned PCI device(s) to cause a DoS through a flood of kernel messages, potentially affecting other domains in the system.

IMPACT

A malicious guest can mount a DoS affecting the entire system.

VULNERABLE SYSTEMS

All systems running guests with access to passed through PCI devices are vulnerable.
Both mainline (“pvops”) and classic-Xen patch kernels are affected.