Several security issues were fixed in the kernel.
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)
8 November 2013
A security issue affects these releases of Ubuntu and its derivatives:
Several security issues were fixed in the kernel.
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 Array 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)
The problem can be corrected by updating your system to the following package versions:
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.
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