Kernel security update: Virtuozzo ReadyKernel patch 70.1 for Virtuozzo 7.0.6 to 7.0.7 HF3

Issue date: 2019-01-24

Applies to: Virtuozzo 7.0

Virtuozzo Advisory ID: VZA-2019-004

1. Overview

The cumulative Virtuozzo ReadyKernel patch was updated with security and stability fixes. The patch applies to Virtuozzo kernels 3.10.0-693.1.1.vz7.37.30 (7.0.6) to 3.10.0-693.21.1.vz7.48.2 (7.0.7 HF3).

2. Security Fixes

  • [Moderate] A flaw was found in the implementation of ebtables in the Linux kernel. A local attacker in a container could exploit it to consume large amounts of memory, eventually causing denial of service on the host. (PSBM-90803)

  • [Low] vhost: kernel crash (access out of bounds) in memcpy_fromiovecend(). (PSBM-90291)

3. Bug Fixes

  • tcache was not shrunk in some situations. (PSBM-89403)

  • Kernel crash (access out of bounds) in SyS_mincore(). (PSBM-90329)

  • If the CPUs in the system supported memory protection keys for userspace (X86_FEATURE_PKU) but the kernel did not, resuming a container could fail. (PSBM-90828)

4. Installing the Update

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