CVE-2016-4565

La memoria de pila InfiniBand (también conocida como IB) en el kernel de Linux en versiones anteriores a 4.5.3 confía incorrectamente en llamadas al sistema de escritura, lo que permite a usuarios locales provocar una denegación de servicio (operación de escritura en la memoria del kernel) o posiblemente tener otro impacto no especificado a través de una interfaz uAPI.

A flaw was found in the way certain interfaces of the Linux kernel's Infiniband subsystem used write() as bi-directional ioctl() replacement, which could lead to insufficient memory security checks when being invoked using the splice() system call. A local unprivileged user on a system with either Infiniband hardware present or RDMA Userspace Connection Manager Access module explicitly loaded, could use this flaw to escalate their privileges on the system.

The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix: A flaw was found in the Linux kernel's keyring handling code, where in key_reject_and_link() an uninitialised variable would eventually lead to arbitrary free address which could allow attacker to use a use-after-free style attack. A flaw was found in the way certain interfaces of the Linux kernel's Infiniband subsystem used write() as bi-directional ioctl() replacement, which could lead to insufficient memory security checks when being invoked using the splice() system call. A local unprivileged user on a system with either Infiniband hardware present or RDMA Userspace Connection Manager Access module explicitly loaded, could use this flaw to escalate their privileges on the system.