Kernel security update: Virtuozzo ReadyKernel patch 85.0 for Virtuozzo 7.0 and Virtuozzo Infrastructure Platform 3.0

Issue date: 2019-08-13

Applies to: Virtuozzo 7.0, Virtuozzo Infrastructure Platform 3.0

Virtuozzo Advisory ID: VZA-2019-064

1. Overview

The cumulative Virtuozzo ReadyKernel patch was updated with security and stability fixes. The patch applies to the kernels 3.10.0-957.12.2.vz7.96.21 (Virtuozzo 7.0.11 and Virtuozzo Infrastructure Platform 3.0).

2. Security Fixes

  • [Moderate] nfs: NULL pointer dereference due to an anomalized NFS message sequence. An attacker, who is able to mount an exported NFS filesystem, is able to trigger a null pointer dereference by using an invalid NFS sequence. This can panic the machine and deny access to the NFS server. Any outstanding disk writes to the NFS server will be lost. (CVE-2018-16871)

3. Bug Fixes

  • vziolimit: kernel crash due to a division by zero in throttle_charge(). (PSBM-95815)

  • kvm: potential system hang due to an error in mmu_shrink_scan(). (PSBM-96262)

  • The warning in mem_cgroup_reparent_charges() was triggered too early and too often in certain cases. (PSBM-96533)

4. Installing the Update

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