Important kernel security update: CVE-2017-18344; Virtuozzo ReadyKernel patch 56.0 for Virtuozzo 7.0.8¶

1. Overview¶

The cumulative Virtuozzo ReadyKernel patch was updated with a security fix. The patch applies to kernel 3.10.0-862.9.1.vz7.63.3 (7.0.8).

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-63.3-56.0-3.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 https://docs.virtuozzo.com/vza/VZA-2018-052.json.