CVE-2017-12193

La función assoc_array_insert_into_terminal_node en lib/assoc_array.c en el kernel de Linux en versiones anteriores a la 4.13.11 gestiona de manera incorrecta la división de nodos, lo que permite que usuarios locales provoquen una denegación de servicio (desreferencia de puntero NULL y pánico) mediante una aplicación manipulada, tal y como demuestra el tipo de clave de conjunto de claves, así como las operaciones de suma de claves y creación de enlaces.

A flaw was found in the Linux kernel's implementation of associative arrays introduced in 3.13. This functionality was backported to the 3.10 kernels in Red Hat Enterprise Linux 7. The flaw involved a null pointer dereference in assoc_array_apply_edit() due to incorrect node-splitting in assoc_array implementation. This affects the keyring key type and thus key addition and link creation operations may cause the kernel to panic.

The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix: An industry-wide issue was found in the way many modern microprocessor designs have implemented speculative execution of instructions. There are three primary variants of the issue which differ in the way the speculative execution can be exploited. Note: This issue is present in hardware and cannot be fully fixed via software update. The updated kernel packages provide software mitigation for this hardware issue at a cost of potential performance penalty. Please refer to References section for further information about this issue and the performance impact.