Buffer overflow in virt/kvm/irq_comm.c in the KVM subsystem in the Linux
kernel before 3.2.24 allows local users to cause a denial of service
(crash) and possibly execute arbitrary code via vectors related to Message
Signaled Interrupts (MSI), irq routing entries, and an incorrect check by
the setup_routing_entry function before invoking the kvm_set_irq function.

A flaw was found in how the Linux kernel's KVM (Kernel-based Virtual
Machine) subsystem handled MSI (Message Signaled Interrupts). A local
unprivileged user could exploit this flaw to cause a denial of service or
potentially elevate privileges.