CVE-2008-3275

Las funciones (1) real_lookup y (2) __lookup_hash en el archivo fs/namei.c en la implementación de vfs en el kernel de Linux anterior a versión 2.6.25.15 no previene la creación de una matriz de elementos secundarios para un directorio eliminado (también se conoce como S_DEAD), que permite a los usuarios locales causar una denegación de servicio ("overflow" del área huérfana UBIFS) por medio de una serie de intentos de creación de archivos sin eliminar los directorios.

It was discovered that there were multiple NULL-pointer function dereferences in the Linux kernel terminal handling code. A local attacker could exploit this to execute arbitrary code as root, or crash the system, leading to a denial of service. The do_change_type routine did not correctly validation administrative users. A local attacker could exploit this to block mount points or cause private mounts to be shared, leading to denial of service or a possible loss of privacy. Tobias Klein discovered that the OSS interface through ALSA did not correctly validate the device number. A local attacker could exploit this to access sensitive kernel memory, leading to a denial of service or a loss of privacy. Zoltan Sogor discovered that new directory entries could be added to already deleted directories. A local attacker could exploit this, filling up available memory and disk space, leading to a denial of service.