CVE-2012-6657

La función sock_setsockopt en net/core/sock.c en el kernel de Linux anterior a 3.5.7 no asegura que una acción keepalive está asociada con un socket de flujo, lo que permite a usuarios locales causar una denegación de servicio (caída del sistema) mediante el aprovechamiento de la habilidad de crear un socket en bruto.

It was found that the Linux kernel's networking implementation did not correctly handle the setting of the keepalive socket option on raw sockets. A local user able to create a raw socket could use this flaw to crash the system.

A flaw was found in the way the Linux kernel handled GS segment register base switching when recovering from a #SS fault on an erroneous return to user space. A local, unprivileged user could use this flaw to escalate their privileges on the system. A flaw was found in the way the Linux kernel's SCTP implementation handled malformed or duplicate Address Configuration Change Chunks. A remote attacker could use either of these flaws to crash the system. A flaw was found in the way the Linux kernel's SCTP implementation handled the association's output queue. A remote attacker could send specially crafted packets that would cause the system to use an excessive amount of memory, leading to a denial of service.