USN-1275-1: Linux kernel vulnerability

21 November 2011

linux vulnerability

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

  • Ubuntu 11.10

Summary

The system could be made to expose sensitive information locally.

Software Description

  • linux - Linux kernel

Details

Peter Huewe discovered an information leak in the handling of reading security-related TPM data. A local, unprivileged user could read the results of a previous TPM command. (CVE-2011-1162)

Vasiliy Kulikov discovered that taskstats did not enforce access restrictions. A local attacker could exploit this to read certain information, leading to a loss of privacy. (CVE-2011-2494)

Mathieu Desnoyers discovered that the kernel sockets implementation incorrectly dereferenced user pointers. A local attacker could possibly exploit this to crash the system. (CVE-2011-4594)

Update instructions

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

Ubuntu 11.10
linux-image-3.0.0-13-generic - 3.0.0-13.22
linux-image-3.0.0-13-generic-pae - 3.0.0-13.22
linux-image-3.0.0-13-omap - 3.0.0-13.22
linux-image-3.0.0-13-powerpc - 3.0.0-13.22
linux-image-3.0.0-13-powerpc-smp - 3.0.0-13.22
linux-image-3.0.0-13-powerpc64-smp - 3.0.0-13.22
linux-image-3.0.0-13-server - 3.0.0-13.22
linux-image-3.0.0-13-virtual - 3.0.0-13.22

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.

References