CVE-2012-2137

Desbordamiento de búfer en virt/KVM/irq_comm.c en el subsistema de KVM en el kernel de Linux antes de v3.2.24 que permite a usuarios locales provocar una denegación de servicio (caída) y posiblemente ejecutar código arbitrario a través de vectores relacionados con las interrupciones señalizadas por mensajes (MSI), entradas iRQ y un control incorrecto de la función setup_routing_entry antes de invocar la función kvm_set_irq.

A flaw was discovered in the Linux kernel's macvtap device driver, which is used in KVM (Kernel-based Virtual Machine) to create a network bridge between host and guest. A privileged user in a guest could exploit this flaw to crash the host, if the vhost_net module is loaded with the experimental_zcopytx option enabled. An error was discovered in the Linux kernel's network TUN/TAP device implementation. A local user with access to the TUN/TAP interface (which is not available to unprivileged users until granted by a root user) could exploit this flaw to crash the system or potential gain administrative privileges. Various other issues were also addressed.