USN-1833-1: Linux kernel vulnerabilities

24 May 2013

linux vulnerabilities

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

  • Ubuntu 12.04 LTS


Several security issues were fixed in the kernel.

Software Description

  • linux - Linux kernel


Andy Lutomirski discover an error in the Linux kernel’s credential handling on unix sockets. A local user could exploit this flaw to gain administrative privileges. (CVE-2013-1979)

A buffer overflow vulnerability was discovered in the Broadcom tg3 ethernet driver for the Linux kernel. A local user could exploit this flaw to cause a denial of service (crash the system) or potentially escalate privileges on the system. (CVE-2013-1929)

An information leak was discovered in the Linux kernel’s tkill and tgkill system calls when used from compat processes. A local user could exploit this flaw to examine potentially sensitive kernel memory. (CVE-2013-2141)

A flaw was discovered in the Linux kernel’s ftrace subsystem interface. A local user could exploit this flaw to cause a denial of service (system crash). (CVE-2013-3301)

Update instructions

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

Ubuntu 12.04 LTS
linux-image-3.2.0-44-generic - 3.2.0-44.69
linux-image-3.2.0-44-generic-pae - 3.2.0-44.69
linux-image-3.2.0-44-highbank - 3.2.0-44.69
linux-image-3.2.0-44-omap - 3.2.0-44.69
linux-image-3.2.0-44-powerpc-smp - 3.2.0-44.69
linux-image-3.2.0-44-powerpc64-smp - 3.2.0-44.69
linux-image-3.2.0-44-virtual - 3.2.0-44.69

To update your system, please follow these instructions:

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.