The virtio_gpu_set_scanout function in QEMU (aka Quick Emulator) built with Virtio GPU Device emulator support allows local guest OS users to cause a denial of service (out-of-bounds read and process crash) via a scanout id in a VIRTIO_GPU_CMD_SET_SCANOUT command larger than num_scanouts.
La función virtio_gpu_set_scanout en QEMU (también conocido como Quick Emulator) construido con el apoyo del emulador Virtio GPU Device permite a los usuarios locales de SO invitados provocar una denegación de servicio (lectura fuera de límites y caída del proceso) a través de un id scanout en un comando VIRTIO_GPU_CMD_SET_SCANOUT mayor que num_scanouts.
Zhenhao Hong discovered that QEMU incorrectly handled the Virtio GPU device. An attacker inside the guest could use this issue to cause QEMU to crash, resulting in a denial of service. This issue only affected Ubuntu 16.04 LTS and Ubuntu 16.10. Li Qiang discovered that QEMU incorrectly handled the 6300esb watchdog. A privileged attacker inside the guest could use this issue to cause QEMU to crash, resulting in a denial of service. Various other issues were also addressed.
