Important kernel security update: CVE-2018-18559; Virtuozzo ReadyKernel patch 64.0 for Virtuozzo 7.0.4 to 7.0.8 HF1

Issue date: 2018-10-26

Applies to: Virtuozzo 7.0

Virtuozzo Advisory ID: VZA-2018-077

1. Overview

The cumulative Virtuozzo ReadyKernel patch was updated with a security fix. The patch applies to all supported Virtuozzo kernels.

2. Security Fixes

  • [Important] It was discovered that a race condition between packet_do_bind() and packet_notifier() in the implementation of AF_PACKET could lead to use-after-free. An unprivileged user on the host or in a container could exploit this to crash the kernel or, potentially, to escalate their privileges in the system. (CVE-2018-18559)

3. Installing the Update

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