4 - USN-2017-1

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 12.04 LTS

Summary:

Several security issues were fixed in the kernel.

Software Description: - linux: Linux kernel

Details:

A denial of service flaw was discovered in the Btrfs file system in the Linux kernel. A local user could cause a denial of service by creating a large number of files with names that have the same CRC32 hash value. (CVE-2012-5374)

A denial of service flaw was discovered in the Btrfs file system in the Linux kernel. A local user could cause a denial of service (prevent file creation) for a victim, by creating a file with a specific CRC32C hash value in a directory important to the victim. (CVE-2012-5375)

Dan Carpenter discovered an information leak in the HP Smart Aray and Compaq SMART2 disk-array driver in the Linux kernel. A local user could exploit this flaw to obtain sensitive information from kernel memory. (CVE-2013-2147)

Update instructions:

The problem can be corrected by updating your system to the following package versions:

Ubuntu 12.04 LTS:
linux-image-3.2.0-56-generic 3.2.0-56.86
linux-image-3.2.0-56-generic-pae 3.2.0-56.86
linux-image-3.2.0-56-highbank 3.2.0-56.86
linux-image-3.2.0-56-omap 3.2.0-56.86
linux-image-3.2.0-56-powerpc-smp 3.2.0-56.86
linux-image-3.2.0-56-powerpc64-smp 3.2.0-56.86
linux-image-3.2.0-56-virtual 3.2.0-56.86

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.

References:
http://www.ubuntu.com/usn/usn-2017-1
CVE-2012-5374, CVE-2012-5375, CVE-2013-2147

Package Information:
https://launchpad.net/ubuntu/+source/linux/3.2.0-56.86