USN-3508-1: Linux kernel vulnerabilities

7 December 2017

linux, linux-raspi2 vulnerabilities

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 17.04

Summary

Several security issues were fixed in the Linux kernel.

Software Description

  • linux - Linux kernel
  • linux-raspi2 - Linux kernel for Raspberry Pi 2

Details

Mohamed Ghannam discovered that a use-after-free vulnerability existed in the Netlink subsystem (XFRM) in the Linux kernel. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2017-16939)

It was discovered that the Linux kernel did not properly handle copy-on- write of transparent huge pages. A local attacker could use this to cause a denial of service (application crashes) or possibly gain administrative privileges. (CVE-2017-1000405)

Yonggang Guo discovered that a race condition existed in the driver subsystem in the Linux kernel. A local attacker could use this to possibly gain administrative privileges. (CVE-2017-12146)

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 17.04
linux-image-4.10.0-1023-raspi2 - 4.10.0-1023.26
linux-image-4.10.0-42-generic - 4.10.0-42.46
linux-image-4.10.0-42-generic-lpae - 4.10.0-42.46
linux-image-4.10.0-42-lowlatency - 4.10.0-42.46
linux-image-generic - 4.10.0.42.42
linux-image-generic-lpae - 4.10.0.42.42
linux-image-lowlatency - 4.10.0.42.42
linux-image-raspi2 - 4.10.0.1023.24

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

After a standard system update you need to reboot your computer to make all the necessary changes.

ATTENTION: Due to an unavoidable ABI change the kernel updates have been given a new version number, which requires you to recompile and reinstall all third party kernel modules you might have installed. Unless you manually uninstalled the standard kernel metapackages (e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual, linux-powerpc), a standard system upgrade will automatically perform this as well.

References