CVE-2012-6547

La función __ tun_chr_ioctl en drivers/net/tun.c en el kernel de Linux anteriores a v3.6 no se inicializa una estructura determinada, que permite a usuarios locales obtener información sensible de la memoria de pila del núcleo a través de una aplicación diseñada.

Updated kernel packages that fix multiple security issues and several bugs are now available for Red Hat Enterprise Linux 6. An integer overflow flaw, leading to a heap-based buffer overflow, was found in the way the Intel i915 driver in the Linux kernel handled the allocation of the buffer used for relocation copies. A local user with console access could use this flaw to cause a denial of service or escalate their privileges. A buffer overflow flaw was found in the way UTF-8 characters were converted to UTF-16 in the utf8s_to_utf16s() function of the Linux kernel's FAT file system implementation. A local user able to mount a FAT file system with the "utf8=1" option could use this flaw to crash the system or, potentially, to escalate their privileges.