Important kernel security update: Virtuozzo ReadyKernel patch 69.0 for Virtuozzo 7.0.4 HF3 to 7.0.8 HF1

Issue date: 2018-12-24

Applies to: Virtuozzo 7.0

Virtuozzo Advisory ID: VZA-2018-089

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] A flaw was found in the implementation of NFS v4.1 in the Linux kernel. NFS v4.1 shares mounted in different network namespaces at the same time can make bc_svc_process() use wrong back-channel ID and cause a use-after-free. A malicious user in a container can exploit this to cause a host kernel memory corruption and a system crash. (CVE-2018-16884)

3. Installing the Update

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