--- title: 'USN-2887-1: 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-2887-1 --- 1. [Ubuntu Security Notices](https://ubuntu.com/security/notices) 2. USN-2887-1 --- # USN-2887-1: Linux kernel vulnerabilities Publication date 2 February 2016 Overview Several security issues were fixed in the kernel. Releases [14.04 LTS](https://ubuntu.com/security/notices?release=trusty) --- Open side navigation ## Packages * [linux](https://ubuntu.com/security/cves?package=linux) - Linux kernel ## Details It was discovered that a use-after-free vulnerability existed in the AF\_UNIX implementation in the Linux kernel. A local attacker could use crafted epoll\_ctl calls to cause a denial of service (system crash) or expose sensitive information. ([CVE-2013-7446](https://ubuntu.com/security/CVE-2013-7446)) It was discovered that the KVM implementation in the Linux kernel did not properly restore the values of the Programmable Interrupt Timer (PIT). A user-assisted attacker in a KVM guest could cause a denial of service in the host (system crash). ([CVE-2015-7513](https://ubuntu.com/security/CVE-2015-7513)) Sasha Levin discovered that the Reliable Datagram Sockets (RDS) implementation in the Linux kernel had a race condition when checking whether a socket was bound or not. A local attacker could use this to cause a denial of service (system crash). ([CVE-2015-7990](https://ubuntu.com/security/CVE-2015-7990)) It was discovered that the Btrfs... --- 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 | | --- | --- | | 14.04 LTS trusty | [linux-image-3.13.0-77-generic](https://launchpad.net/ubuntu/+source/linux) –  [3.13.0-77.121](https://launchpad.net/ubuntu/+source/linux/3.13.0-77.121) | | | | [linux-image-3.13.0-77-generic-lpae](https://launchpad.net/ubuntu/+source/linux) –  [3.13.0-77.121](https://launchpad.net/ubuntu/+source/linux/3.13.0-77.121) | | | | [linux-image-3.13.0-77-lowlatency](https://launchpad.net/ubuntu/+source/linux) –  [3.13.0-77.121](https://launchpad.net/ubuntu/+source/linux/3.13.0-77.121) | | | | [linux-image-3.13.0-77-powerpc-e500](https://launchpad.net/ubuntu/+source/linux) –  [3.13.0-77.121](https://launchpad.net/ubuntu/+source/linux/3.13.0-77.121) | | | | [linux-image-3.13.0-77-powerpc-e500mc](https://launchpad.net/ubuntu/+source/linux) –  [3.13.0-77.121](https://launchpad.net/ubuntu/+source/linux/3.13.0-77.121) | | | | [linux-image-3.13.0-77-powerpc-smp](https://launchpad.net/ubuntu/+source/linux) –  [3.13.0-77.121](https://launchpad.net/ubuntu/+source/linux/3.13.0-77.121) | | | | [linux-image-3.13.0-77-powerpc64-emb](https://launchpad.net/ubuntu/+source/linux) –  [3.13.0-77.121](https://launchpad.net/ubuntu/+source/linux/3.13.0-77.121) | | | | [linux-image-3.13.0-77-powerpc64-smp](https://launchpad.net/ubuntu/+source/linux) –  [3.13.0-77.121](https://launchpad.net/ubuntu/+source/linux/3.13.0-77.121) | | | --- ### 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-2015-8374](https://ubuntu.com/security/CVE-2015-8374) * [CVE-2015-7990](https://ubuntu.com/security/CVE-2015-7990) * [CVE-2015-7513](https://ubuntu.com/security/CVE-2015-7513) * [CVE-2013-7446](https://ubuntu.com/security/CVE-2013-7446) ## Related notices * [USN-2890-2](https://ubuntu.com/security/notices/USN-2890-2) * [USN-2890-3](https://ubuntu.com/security/notices/USN-2890-3) * [USN-2890-1](https://ubuntu.com/security/notices/USN-2890-1) * [USN-2889-2](https://ubuntu.com/security/notices/USN-2889-2) * [USN-2889-1](https://ubuntu.com/security/notices/USN-2889-1) * [USN-2888-1](https://ubuntu.com/security/notices/USN-2888-1) * [USN-2887-2](https://ubuntu.com/security/notices/USN-2887-2) * [USN-2886-2](https://ubuntu.com/security/notices/USN-2886-2) * [USN-2886-1](https://ubuntu.com/security/notices/USN-2886-1) --- 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)