Important kernel security update: CVE-2017-18344; Virtuozzo ReadyKernel patch 56.0 for all supported Virtuozzo 7.0 kernels

Issue date: 2018-08-06

Applies to: Virtuozzo 7.0

Virtuozzo Advisory ID: VZA-2018-050

1. Overview

The cumulative Virtuozzo ReadyKernel patch was updated with a security fix. The patch applies to all supported Virtuozzo 7.0 kernels.

2. Security Fixes

• [Important] The implementation of timer_create system call in the Linux kernel before 4.14.8 doesn’t properly validate the sigevent::sigev_notify field, which leads to out-of-bounds access in the show_timer function (called when /proc/$PID/timers is read). This allows userspace applications to read arbitrary kernel memory (on a kernel built with CONFIG_POSIX_TIMERS and CONFIG_CHECKPOINT_RESTORE). (CVE-2017-18344)

3. Installing the Update

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

4. References

• https://readykernel.com/patch/Virtuozzo-7/readykernel-patch-30.10-56.0-1.vl7/
• https://readykernel.com/patch/Virtuozzo-7/readykernel-patch-30.15-56.0-1.vl7/
• https://readykernel.com/patch/Virtuozzo-7/readykernel-patch-33.22-56.0-1.vl7/
• https://readykernel.com/patch/Virtuozzo-7/readykernel-patch-37.30-56.0-1.vl7/
• https://readykernel.com/patch/Virtuozzo-7/readykernel-patch-40.4-56.0-1.vl7/
• https://readykernel.com/patch/Virtuozzo-7/readykernel-patch-43.10-56.0-1.vl7/
• https://readykernel.com/patch/Virtuozzo-7/readykernel-patch-46.7-56.0-1.vl7/
• https://readykernel.com/patch/Virtuozzo-7/readykernel-patch-48.2-56.0-1.vl7/
• http://www.openwall.com/lists/oss-security/2018/08/02/3

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