CVE-2022-2959

Se ha encontrado una condición de carrera en la cola de vigilancia del kernel de Linux debido a una falta de bloqueo en la función pipe_resize_ring(). El fallo específico se presenta en la administración de los búferes de las tuberías. El problema es debido a una falta de bloqueo apropiado cuando son realizadas operaciones sobre un objeto. Este fallo permite a un usuario local bloquear el sistema o escalar sus privilegios en el sistema.

A race condition was found in the Linux kernel's watch queue due to a missing lock in the pipe_resize_ring(). The race condition occurs when a thread uses ioctl(IOC_WATCH_QUEUE_SET_SIZE) to resize the pipe buffer and free the old pipe buffer, while another thread uses keyctl() to trigger a notification in the watch queue, calling post_one_notification() and accessing the freed pipe buffer. This flaw allows a local user to crash the system or escalate their privileges on the system.

This vulnerability allows local attackers to escalate privileges on affected installations of Linux Kernel. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability.
The specific flaw exists within the handling of pipe buffers. The issue results from the lack of proper locking when performing operations on an object. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of the kernel.