USN-2946-1: Linux kernel vulnerabilities
6 April 2016
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 14.04 LTS
Several security issues were fixed in the kernel.
- linux - Linux kernel
Venkatesh Pottem discovered a use-after-free vulnerability in the Linux kernel’s CXGB3 driver. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2015-8812)
Xiaofei Rex Guo discovered a timing side channel vulnerability in the Linux Extended Verification Module (EVM). An attacker could use this to affect system integrity. (CVE-2016-2085)
David Herrmann discovered that the Linux kernel incorrectly accounted file descriptors to the original opener for in-flight file descriptors sent over a unix domain socket. A local attacker could use this to cause a denial of service (resource exhaustion). (CVE-2016-2550)
It was discovered that the Linux kernel did not enforce limits on the amount of data allocated to buffer pipes. A local attacker could use this to cause a denial of service (resource exhaustion). (CVE-2016-2847)
The problem can be corrected by updating your system to the following package versions:
- Ubuntu 14.04 LTS
- linux-image-3.13.0-85-generic - 3.13.0-85.129
- linux-image-3.13.0-85-generic-lpae - 3.13.0-85.129
- linux-image-3.13.0-85-lowlatency - 3.13.0-85.129
- linux-image-3.13.0-85-powerpc-e500 - 3.13.0-85.129
- linux-image-3.13.0-85-powerpc-e500mc - 3.13.0-85.129
- linux-image-3.13.0-85-powerpc-smp - 3.13.0-85.129
- linux-image-3.13.0-85-powerpc64-emb - 3.13.0-85.129
- linux-image-3.13.0-85-powerpc64-smp - 3.13.0-85.129
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.