Important kernel security update: CVE-2017-18344; Virtuozzo ReadyKernel patch 56.0 for Virtuozzo 7.0.8

Issue date: 2018-08-09

Applies to: Virtuozzo 7.0

Virtuozzo Advisory ID: VZA-2018-052

1. Overview

The cumulative Virtuozzo ReadyKernel patch was updated with a security fix. The patch applies to kernel 3.10.0-862.9.1.vz7.63.3 (7.0.8).

2. Security Fixes

  • [Important] The implementation of timer_create system call in the Linux kernel before 4.14.8 doesn’t properly validate the sigevent::sigev_notify field, which leads to out-of-bounds access in the show_timer function (called when /proc/$PID/timers is read). This allows userspace applications to read arbitrary kernel memory (on a kernel built with CONFIG_POSIX_TIMERS and CONFIG_CHECKPOINT_RESTORE). (CVE-2017-18344)

3. Installing the Update

Download, install, and immediately apply the patch to the current kernel by running ‘readykernel update’.