USN-2492-1: Linux kernel vulnerabilities
4 February 2015
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 12.04 LTS
Several security issues were fixed in the kernel.
- linux - Linux kernel
Andy Lutomirski discovered an information leak in the Linux kernel’s Thread Local Storage (TLS) implementation allowing users to bypass the espfix to obtain information that could be used to bypass the Address Space Layout Randomization (ASLR) protection mechanism. A local user could exploit this flaw to obtain potentially sensitive information from kernel memory. (CVE-2014-8133)
A flaw was discovered with file renaming in the linux kernel. A local user could exploit this flaw to cause a denial of service (deadlock and system hang). (CVE-2014-8559)
Prasad J Pandit reported a flaw in the rock_continue function of the Linux kernel’s ISO 9660 CDROM file system. A local user could exploit this flaw to cause a denial of service (system crash or hang). (CVE-2014-9420)
The problem can be corrected by updating your system to the following package versions:
- Ubuntu 12.04 LTS
- linux-image-3.2.0-76-generic - 3.2.0-76.111
- linux-image-3.2.0-76-generic-pae - 3.2.0-76.111
- linux-image-3.2.0-76-highbank - 3.2.0-76.111
- linux-image-3.2.0-76-omap - 3.2.0-76.111
- linux-image-3.2.0-76-powerpc-smp - 3.2.0-76.111
- linux-image-3.2.0-76-powerpc64-smp - 3.2.0-76.111
- linux-image-3.2.0-76-virtual - 3.2.0-76.111
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. 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.