--- title: 'USN-2948-2: Linux kernel (Utopic HWE) regression | 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-2948-2 --- 1. [Ubuntu Security Notices](https://ubuntu.com/security/notices) 2. USN-2948-2 --- # USN-2948-2: Linux kernel (Utopic HWE) regression Publication date 11 April 2016 Overview USN 2948-1 introduced a regression in the Ubuntu 14.10 Linux kernel backported to Ubuntu 14.04 LTS. Releases [14.04 LTS](https://ubuntu.com/security/notices?release=trusty) --- Open side navigation ## Packages * [linux-lts-utopic](https://ubuntu.com/security/cves?package=linux-lts-utopic) - Linux hardware enablement kernel from Utopic for Trusty ## Details USN-2948-1 fixed vulnerabilities in the Ubuntu 14.10 Linux kernel backported to Ubuntu 14.04 LTS. An incorrect reference counting fix in the radeon driver introduced a regression that could cause a system crash. This update fixes the problem. We apologize for the inconvenience. Original advisory details: Ralf Spenneberg discovered that the USB driver for Clie devices in the Linux kernel did not properly validate the endpoints reported by the device. An attacker with physical access could cause a denial of service (system crash). ([CVE-2015-7566](https://ubuntu.com/security/CVE-2015-7566)) Ralf Spenneberg discovered that the usbvision driver in the Linux kernel did not properly validate the interfaces and endpoints reported by the device. An attacker with physical access could cause a denial of service (system crash). ([CVE-2015-7833](https://ubuntu.com/security/CVE-2015-7833)) Venkatesh Pottem discovered a... --- 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-3.16.0-70-generic](https://launchpad.net/ubuntu/+source/linux-lts-utopic) –  [3.16.0-70.90~14.04.1](https://launchpad.net/ubuntu/+source/linux-lts-utopic/3.16.0-70.90~14.04.1) | | | | [linux-image-3.16.0-70-generic-lpae](https://launchpad.net/ubuntu/+source/linux-lts-utopic) –  [3.16.0-70.90~14.04.1](https://launchpad.net/ubuntu/+source/linux-lts-utopic/3.16.0-70.90~14.04.1) | | | | [linux-image-3.16.0-70-lowlatency](https://launchpad.net/ubuntu/+source/linux-lts-utopic) –  [3.16.0-70.90~14.04.1](https://launchpad.net/ubuntu/+source/linux-lts-utopic/3.16.0-70.90~14.04.1) | | | | [linux-image-3.16.0-70-powerpc-e500mc](https://launchpad.net/ubuntu/+source/linux-lts-utopic) –  [3.16.0-70.90~14.04.1](https://launchpad.net/ubuntu/+source/linux-lts-utopic/3.16.0-70.90~14.04.1) | | | | [linux-image-3.16.0-70-powerpc-smp](https://launchpad.net/ubuntu/+source/linux-lts-utopic) –  [3.16.0-70.90~14.04.1](https://launchpad.net/ubuntu/+source/linux-lts-utopic/3.16.0-70.90~14.04.1) | | | | [linux-image-3.16.0-70-powerpc64-emb](https://launchpad.net/ubuntu/+source/linux-lts-utopic) –  [3.16.0-70.90~14.04.1](https://launchpad.net/ubuntu/+source/linux-lts-utopic/3.16.0-70.90~14.04.1) | | | | [linux-image-3.16.0-70-powerpc64-smp](https://launchpad.net/ubuntu/+source/linux-lts-utopic) –  [3.16.0-70.90~14.04.1](https://launchpad.net/ubuntu/+source/linux-lts-utopic/3.16.0-70.90~14.04.1) | | | --- ### 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 * --- 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)