[USN-1535-1] Linux kernel vulnerabilities

John Johansen john.johansen at canonical.com
Fri Aug 10 22:58:18 UTC 2012


==========================================================================
Ubuntu Security Notice USN-1535-1
August 10, 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 versions:

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

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:
  http://www.ubuntu.com/usn/usn-1535-1
  CVE-2012-2136, CVE-2012-2390

Package Information:
  https://launchpad.net/ubuntu/+source/linux/2.6.32-42.95

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