[Security] Virtuozzo ReadyKernel patch 126.0 for Virtuozzo Hybrid Server 7.0, 7.5 and Virtuozzo Hybrid Infrastructure 3.5, 4.0, 4.5

Issue date: 2021-04-20

Applies to: Virtuozzo Hybrid Infrastructure 3.5, Virtuozzo Hybrid Infrastructure 4.0, Virtuozzo Hybrid Infrastructure 4.5, Virtuozzo Hybrid Server 7.0, Virtuozzo Hybrid Server 7.5

Virtuozzo Advisory ID: VZA-2021-020

1. Overview

The cumulative Virtuozzo ReadyKernel patch was updated with security and stability fixes. The patch applies to all supported kernels of Virtuozzo Hybrid Server 7 and Virtuozzo Hybrid Infrastructure.

2. Security Fixes

  • [Moderate] [3.10.0-1062.4.2.vz7.116.7 to 3.10.0-1127.18.2.vz7.163.46] netfilter: potential memory corruption could happen when CLUSTERIP was used. It was discovered that an attacker could trigger kernel memory corruption from a container by using a specially crafted sequence of operations with CLUSTERIP-related netfilter rules. (PSBM-128405)

3. Bug Fixes

  • [3.10.0-1062.4.2.vz7.116.7 to 3.10.0-1127.18.2.vz7.163.46] The kernel could crash in kmapset_hash() while stopping a container. (PSBM-127478)

  • [3.10.0-1062.4.2.vz7.116.7 to 3.10.0-1127.18.2.vz7.163.46] Incorrect updates of page cache during certain operations with Virtuozzo Storage could lead to kernel crash. (VSTOR-42863)

4. Installing the Update

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