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

Issue date: 2021-04-20

Applies to: Virtuozzo Infrastructure 3.5, Virtuozzo Infrastructure 4.0, Virtuozzo Infrastructure 4.5, Virtuozzo Server 7.0, Virtuozzo 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 Server 7 and Virtuozzo 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’.

5. References

The JSON file with the list of new and updated packages is available at JSON file.