CVE-2016-0774

Las implementaciones (1) pipe_read y (2) pipe_write en fs/pipe.c en un determinado backport del kernel de Linux en el paquete linux en versiones anteriores a 3.2.73-2+deb7u3 sobre Debian wheezy y el paquete kernel en versiones anteriores a 3.10.0-229.26.2 sobre Red Hat Enterprise Linux (RHEL) 7.1 no considera correctamente los efectos laterales de llamadas __copy_to_user_inatomic y __copy_from_user_inatomic fallidas, lo que permite a usuarios locales provocar una denegación de servicio (caída de sistema) o posiblemente obtener prvilegios a través de una aplicación manipulada, también conocido como un "I/O vector array overrun". NOTA: esta vulnerabilidad existe debido a una solución incorrecta para CVE-2015-1805.

It was found that the fix for CVE-2015-1805 incorrectly kept buffer offset and buffer length in sync on a failed atomic read, potentially resulting in a pipe buffer state corruption. A local, unprivileged user could use this flaw to crash the system or leak kernel memory to user space.

The kernel packages contain the Linux kernel, the core of any Linux operating system. It was found that the x86 ISA is prone to a denial of service attack inside a virtualized environment in the form of an infinite loop in the microcode due to the way delivering of benign exceptions such as #DB is handled. A privileged user inside a guest could use this flaw to create denial of service conditions on the host kernel. A use-after-free flaw was found in the way the Linux kernel's key management subsystem handled keyring object reference counting in certain error path of the join_session_keyring() function. A local, unprivileged user could use this flaw to escalate their privileges on the system.