USN-1972-1: Linux kernel vulnerabilities
27 September 2013
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 12.10
Several security issues were fixed in the kernel.
- linux - Linux kernel
Vince Weaver discovered a flaw in the perf subsystem of the Linux kernel on ARM platforms. A local user could exploit this flaw to gain privileges or cause a denial of service (system crash). (CVE-2013-4254)
A failure to validate block numbers was discovered in the Linux kernel’s implementation of the XFS filesystem. A local user can cause a denial of service (system crash) if they can mount, or cause to be mounted a corrupted or special crafted XFS filesystem. (CVE-2013-1819)
An information leak was discovered in the Linux kernel when reading broadcast messages from the notify_policy interface of the IPSec key_socket. A local user could exploit this flaw to examine potentially sensitive information in kernel memory. (CVE-2013-2237)
The problem can be corrected by updating your system to the following package versions:
- Ubuntu 12.10
- linux-image-3.5.0-41-generic - 3.5.0-41.64
- linux-image-3.5.0-41-highbank - 3.5.0-41.64
- linux-image-3.5.0-41-omap - 3.5.0-41.64
- linux-image-3.5.0-41-powerpc-smp - 3.5.0-41.64
- linux-image-3.5.0-41-powerpc64-smp - 3.5.0-41.64
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.