--- title: 'USN-2663-1: 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-2663-1 --- 1. [Ubuntu Security Notices](https://ubuntu.com/security/notices) 2. USN-2663-1 --- # USN-2663-1: Linux kernel vulnerabilities Publication date 7 July 2015 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 Alexandre Oliva reported a race condition flaw in the btrfs file system's handling of extended attributes (xattrs). A local attacker could exploit this flaw to bypass ACLs and potentially escalate privileges. ([CVE-2014-9710](https://ubuntu.com/security/CVE-2014-9710)) A race condition was discovered in the Linux kernel's file\_handle size verification. A local user could exploit this flaw to read potentially sensative memory locations. ([CVE-2015-1420](https://ubuntu.com/security/CVE-2015-1420)) A underflow error was discovered in the Linux kernel's Ozmo Devices USB over WiFi host controller driver. A remote attacker could exploit this flaw to cause a denial of service (system crash) or potentially execute arbitrary code via a specially crafted packet. ([CVE-2015-4001](https://ubuntu.com/security/CVE-2015-4001)) A bounds check error was discovered in the Linux kernel's Ozmo Devices USB over WiFi host controller driver. A remote attacker could... --- 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. If you use linux-restricted-modules, you have to update that package as well to get modules which work with the new kernel version. Unless you manually uninstalled the standard kernel metapackages (e.g. linux-generic, linux-server, 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-3.13.0-57-generic](https://launchpad.net/ubuntu/+source/linux) –  [3.13.0-57.95](https://launchpad.net/ubuntu/+source/linux/3.13.0-57.95) | | | | [linux-image-3.13.0-57-generic-lpae](https://launchpad.net/ubuntu/+source/linux) –  [3.13.0-57.95](https://launchpad.net/ubuntu/+source/linux/3.13.0-57.95) | | | | [linux-image-3.13.0-57-lowlatency](https://launchpad.net/ubuntu/+source/linux) –  [3.13.0-57.95](https://launchpad.net/ubuntu/+source/linux/3.13.0-57.95) | | | | [linux-image-3.13.0-57-powerpc-e500](https://launchpad.net/ubuntu/+source/linux) –  [3.13.0-57.95](https://launchpad.net/ubuntu/+source/linux/3.13.0-57.95) | | | | [linux-image-3.13.0-57-powerpc-e500mc](https://launchpad.net/ubuntu/+source/linux) –  [3.13.0-57.95](https://launchpad.net/ubuntu/+source/linux/3.13.0-57.95) | | | | [linux-image-3.13.0-57-powerpc-smp](https://launchpad.net/ubuntu/+source/linux) –  [3.13.0-57.95](https://launchpad.net/ubuntu/+source/linux/3.13.0-57.95) | | | | [linux-image-3.13.0-57-powerpc64-emb](https://launchpad.net/ubuntu/+source/linux) –  [3.13.0-57.95](https://launchpad.net/ubuntu/+source/linux/3.13.0-57.95) | | | | [linux-image-3.13.0-57-powerpc64-smp](https://launchpad.net/ubuntu/+source/linux) –  [3.13.0-57.95](https://launchpad.net/ubuntu/+source/linux/3.13.0-57.95) | | | --- ### 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-2015-4167](https://ubuntu.com/security/CVE-2015-4167) * [CVE-2015-4003](https://ubuntu.com/security/CVE-2015-4003) * [CVE-2015-4002](https://ubuntu.com/security/CVE-2015-4002) * [CVE-2015-4001](https://ubuntu.com/security/CVE-2015-4001) * [CVE-2015-1420](https://ubuntu.com/security/CVE-2015-1420) * [CVE-2014-9710](https://ubuntu.com/security/CVE-2014-9710) ## Related notices * [USN-2667-1](https://ubuntu.com/security/notices/USN-2667-1) * [USN-2666-1](https://ubuntu.com/security/notices/USN-2666-1) * [USN-2665-1](https://ubuntu.com/security/notices/USN-2665-1) * [USN-2664-1](https://ubuntu.com/security/notices/USN-2664-1) * [USN-2662-1](https://ubuntu.com/security/notices/USN-2662-1) * [USN-2661-1](https://ubuntu.com/security/notices/USN-2661-1) * [USN-2660-1](https://ubuntu.com/security/notices/USN-2660-1) * [USN-2632-1](https://ubuntu.com/security/notices/USN-2632-1) * [USN-2631-1](https://ubuntu.com/security/notices/USN-2631-1) * [USN-2616-1](https://ubuntu.com/security/notices/USN-2616-1) --- Show 1 more references --- Have additional questions? 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