USN-1515-1: Linux kernel vulnerability

Ubuntu Security Notice USN-1515-1

23rd July, 2012

linux vulnerability

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

  • Ubuntu 12.04 LTS

Summary

The system could be made to crash under certain conditions.

Software description

  • linux - Linux kernel

Details

An error was discovered in the Linux kernel's memory subsystem (hugetlb).
An unprivileged local user could exploit this flaw to cause a denial of
service (crash the system).

Update instructions

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

Ubuntu 12.04 LTS:
linux-image-3.2.0-27-virtual 3.2.0-27.43
linux-image-3.2.0-27-generic-pae 3.2.0-27.43
linux-image-3.2.0-27-powerpc-smp 3.2.0-27.43
linux-image-3.2.0-27-powerpc64-smp 3.2.0-27.43
linux-image-3.2.0-27-omap 3.2.0-27.43
linux-image-3.2.0-27-generic 3.2.0-27.43
linux-image-3.2.0-27-highbank 3.2.0-27.43

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

CVE-2012-2390