--- title: 'USN-3161-1: Linux kernel vulnerabilities | Ubuntu security notices' description: Ubuntu is an open source software operating system that runs from the desktop, to the cloud, to all your internet connected things. url: https://ubuntu.com/security/notices/USN-3161-1 --- 1. [Ubuntu Security Notices](https://ubuntu.com/security/notices) 2. USN-3161-1 --- # USN-3161-1: Linux kernel vulnerabilities Publication date 20 December 2016 Overview Several security issues were fixed in the kernel. Releases [16.04 LTS](https://ubuntu.com/security/notices?release=xenial) --- Open side navigation ## Packages * [linux](https://ubuntu.com/security/cves?package=linux) - Linux kernel ## Details Tilman Schmidt and Sasha Levin discovered a use-after-free condition in the TTY implementation in the Linux kernel. A local attacker could use this to expose sensitive information (kernel memory). ([CVE-2015-8964](https://ubuntu.com/security/CVE-2015-8964)) It was discovered that the Video For Linux Two (v4l2) implementation in the Linux kernel did not properly handle multiple planes when processing a VIDIOC\_DQBUF ioctl(). A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. ([CVE-2016-4568](https://ubuntu.com/security/CVE-2016-4568)) CAI Qian discovered that shared bind mounts in a mount namespace exponentially added entries without restriction to the Linux kernel's mount table. A local attacker could use this to cause a denial of service (system crash). ([CVE-2016-6213](https://ubuntu.com/security/CVE-2016-6213)) It was discovered that the KVM implementation for x86/x86\_64 in the... --- Show more ## Update instructions After a standard system update you need to reboot your computer to make all the necessary changes. [Learn more about how to get the fixes.](https://ubuntu.com/security/cves/about#security) 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. The problem can be corrected by updating your system to the following package versions: | Ubuntu Release | Package Version | | --- | --- | | 16.04 LTS xenial | [linux-image-4.4.0-57-generic](https://launchpad.net/ubuntu/+source/linux) –  [4.4.0-57.78](https://launchpad.net/ubuntu/+source/linux/4.4.0-57.78) | | | | [linux-image-4.4.0-57-generic-lpae](https://launchpad.net/ubuntu/+source/linux) –  [4.4.0-57.78](https://launchpad.net/ubuntu/+source/linux/4.4.0-57.78) | | | | [linux-image-4.4.0-57-lowlatency](https://launchpad.net/ubuntu/+source/linux) –  [4.4.0-57.78](https://launchpad.net/ubuntu/+source/linux/4.4.0-57.78) | | | | [linux-image-4.4.0-57-powerpc-e500mc](https://launchpad.net/ubuntu/+source/linux) –  [4.4.0-57.78](https://launchpad.net/ubuntu/+source/linux/4.4.0-57.78) | | | | [linux-image-4.4.0-57-powerpc-smp](https://launchpad.net/ubuntu/+source/linux) –  [4.4.0-57.78](https://launchpad.net/ubuntu/+source/linux/4.4.0-57.78) | | | | [linux-image-4.4.0-57-powerpc64-emb](https://launchpad.net/ubuntu/+source/linux) –  [4.4.0-57.78](https://launchpad.net/ubuntu/+source/linux/4.4.0-57.78) | | | | [linux-image-4.4.0-57-powerpc64-smp](https://launchpad.net/ubuntu/+source/linux) –  [4.4.0-57.78](https://launchpad.net/ubuntu/+source/linux/4.4.0-57.78) | | | --- ### Reduce your security exposure Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines. [Get Ubuntu Pro](https://ubuntu.com/pro) ## References * [CVE-2016-9555](https://ubuntu.com/security/CVE-2016-9555) * [CVE-2016-8645](https://ubuntu.com/security/CVE-2016-8645) * [CVE-2016-8633](https://ubuntu.com/security/CVE-2016-8633) * [CVE-2016-8630](https://ubuntu.com/security/CVE-2016-8630) * [CVE-2016-6213](https://ubuntu.com/security/CVE-2016-6213) * [CVE-2016-4568](https://ubuntu.com/security/CVE-2016-4568) * [CVE-2015-8964](https://ubuntu.com/security/CVE-2015-8964) ## Related notices * [USN-3445-1](https://ubuntu.com/security/notices/USN-3445-1) * [USN-3445-2](https://ubuntu.com/security/notices/USN-3445-2) * [USN-3360-1](https://ubuntu.com/security/notices/USN-3360-1) * [USN-3360-2](https://ubuntu.com/security/notices/USN-3360-2) * [USN-3290-1](https://ubuntu.com/security/notices/USN-3290-1) * [USN-3188-1](https://ubuntu.com/security/notices/USN-3188-1) * [USN-3188-2](https://ubuntu.com/security/notices/USN-3188-2) * [USN-3187-1](https://ubuntu.com/security/notices/USN-3187-1) * [USN-3187-2](https://ubuntu.com/security/notices/USN-3187-2) * [USN-3162-2](https://ubuntu.com/security/notices/USN-3162-2) --- Show 6 more references --- Have additional questions? [Talk to a member of the team ›](https://wiki.ubuntu.com/SecurityTeam/FAQ?_ga=2.242131138.1744859116.1742138161-1500419473.1726851136&_gl=1*161muja*_gcl_au*MzUyMTIzNjI1LjE3MzYyNDQ4NTE.#Contact)