Kernel security update: CVE-2018-5803; Virtuozzo ReadyKernel patch 52.0 for Virtuozzo 7.0.6 HF3, 7.0.7, and 7.0.7 HF2

Issue date: 2018-05-30

Applies to: Virtuozzo 7.0

Virtuozzo Advisory ID: VZA-2018-036

1. Overview

The cumulative Virtuozzo ReadyKernel patch was updated with security and stability fixes. The patch applies to Virtuozzo 7.0 kernels 3.10.0-693.11.6.vz7.40.4 (7.0.6 HF3), 3.10.0-693.17.1.vz7.43.10 (7.0.7), 3.10.0-693.21.1.vz7.46.7 (7.0.7 HF2).

2. Security Fixes

  • [Moderate] It was found that _sctp_make_chunk() function did not check if the chunk length for INIT and INIT_ACK packets was within the allowed limits. A local attacker could exploit this to trigger a kernel crash. (CVE-2018-5803)

3. Bug Fixes

  • Potential kernel crash in tcache_detach_page(). (PSBM-81731)

4. Installing the Update

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