USN-1535-1: Linux kernel vulnerabilities

Ubuntu Security Notice USN-1535-1

10th August, 2012

linux vulnerabilities

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

  • Ubuntu 10.04 LTS

Summary

Several security issues were fixed in the kernel.

Software description

  • linux - Linux kernel

Details

An error was discovered in the Linux kernel's network TUN/TAP device
implementation. A local user with access to the TUN/TAP interface (which is
not available to unprivileged users until granted by a root user) could
exploit this flaw to crash the system or potential gain administrative
privileges. (CVE-2012-2136)

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). (CVE-2012-2390)

Update instructions

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

Ubuntu 10.04 LTS:
linux-image-2.6.32-42-386 2.6.32-42.95
linux-image-2.6.32-42-powerpc 2.6.32-42.95
linux-image-2.6.32-42-powerpc64-smp 2.6.32-42.95
linux-image-2.6.32-42-generic-pae 2.6.32-42.95
linux-image-2.6.32-42-sparc64 2.6.32-42.95
linux-image-2.6.32-42-generic 2.6.32-42.95
linux-image-2.6.32-42-versatile 2.6.32-42.95
linux-image-2.6.32-42-virtual 2.6.32-42.95
linux-image-2.6.32-42-server 2.6.32-42.95
linux-image-2.6.32-42-ia64 2.6.32-42.95
linux-image-2.6.32-42-sparc64-smp 2.6.32-42.95
linux-image-2.6.32-42-preempt 2.6.32-42.95
linux-image-2.6.32-42-powerpc-smp 2.6.32-42.95
linux-image-2.6.32-42-lpia 2.6.32-42.95

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-2012-2136, CVE-2012-2390