CVE-2017-8797

The NFSv4 server in the Linux kernel before 4.11.3 does not properly validate the layout type when processing the NFSv4 pNFS GETDEVICEINFO or LAYOUTGET operand in a UDP packet from a remote attacker. This type value is uninitialized upon encountering certain error conditions. This value is used as an array index for dereferencing, which leads to an OOPS and eventually a DoS of knfsd and a soft-lockup of the whole system.

The NFSv4 server in the Linux kernel before 4.11.3 does not properly validate the layout type when processing the NFSv4 pNFS GETDEVICEINFO or LAYOUTGET operand in a UDP packet from a remote attacker. This type value is uninitialized upon encountering certain error conditions. This value is used as an array index for dereferencing, which leads to an OOPS and eventually a DoS of knfsd and a soft-lockup of the whole system.

El servidor NFSv4 en el kernel de Linux en versiones anteriores a la 4.11.3 no valida correctamente el tipo de diseño al procesar los operandos NFSv4 pNFS GETDEVICEINFO o LAYOUTGET en un paquete UDP de un atacante remoto. Este valor de tipo no se inicializa al encontrarse ciertas condiciones de error. Este valor se emplea como índice de arrays para desreferenciar, lo que conduce a un error OOPS y, finalmente, a una DoS de knfsd y a un bloqueo parcial de todo el sistema.