CVE-2017-10911

La función make_response en el archivo drivers/block/xen-blkback/blkback.c en el kernel de Linux anterior a versión 4.11.8, permite a los usuarios del sistema operativo invitado obtener información confidencial de la memoria del kernel del sistema operativo host (u otro sistema operativo invitado) mediante el aprovechamiento de la copia de campos de relleno no inicializados en estructuras de respuesta de la interfaz del bloque Xen, también se conoce como XSA-216.

Anthony Perard discovered that the Xen virtual block driver did not properly initialize some data structures before passing them to user space. A local attacker in a guest VM could use this to expose sensitive information from the host OS or other guest VMs. Bo Zhang discovered that the netlink wireless configuration interface in the Linux kernel did not properly validate attributes when handling certain requests. A local attacker with the CAP_NET_ADMIN could use this to cause a denial of service (system crash). It was discovered that the nested KVM implementation in the Linux kernel in some situations did not properly prevent second level guests from reading and writing the hardware CR8 register. A local attacker in a guest could use this to cause a denial of service (system crash). Otto Ebeling discovered that the memory manager in the Linux kernel did not properly check the effective UID in some situations. A local attacker could use this to expose sensitive information.