CVE-2011-2942

Un parche de Red Hat para la función __br_deliver en net/bridge/br_forward.c en el Kernel de Linux v2.6.18 en Red Hat Enterprise Linux (RHEL) 5 permite a atacantes remotos causar una denegación de servicio (NULL pointer dereference y caída del sistema) o posiblemente tener otro impacto no especificado mediante el aprovechamiento de la conectividad con una interfaz de red que utiliza un dispositivo Ethernet puente.

An updated rhev-hypervisor package that fixes several security issues is now available. The RHBA-2011:1254 update introduced a regression in the Linux kernel's Ethernet bridge implementation. If a system had an interface in a bridge, and an attacker on the local network could send packets to that interface, they could cause a denial of service on that system. A flaw in the Linux kernel could lead to GRO (Generic Receive Offload) fields being left in an inconsistent state. An attacker on the local network could use this flaw to trigger a denial of service. GRO is enabled by default in all network drivers that support it. Various other issues have also been addressed.