Ubuntu: 1389-1: Linux kernel vulnerabilities
Posted by Benjamin D. Thomas   
Ubuntu Several security issues were fixed in the kernel.
==========================================================================
Ubuntu Security Notice USN-1389-1
March 06, 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:

Paolo Bonzini discovered a flaw in Linux's handling of the SG_IO ioctl
command. A local user, or user in a VM could exploit this flaw to bypass
restrictions and gain read/write access to all data on the affected block
device. (CVE-2011-4127)

Sasha Levin discovered a flaw in the permission checking for device
assignments requested via the kvm ioctl in the Linux kernel. A local user
could use this flaw to crash the system causing a denial of service.
(CVE-2011-4347)

A flaw was found in KVM's Programmable Interval Timer (PIT). When a virtual
interrupt control is not available a local user could use this to cause a
denial of service by starting a timer. (CVE-2011-4622)

A flaw was discovered in the XFS filesystem. If a local user mounts a
specially crafted XFS image it could potential execute arbitrary code on
the system. (CVE-2012-0038)

Louis Rilling discovered a flaw in Linux kernel's clone command when
CLONE_IO is specified. An unprivileged local user could exploit this to
cause a denial of service. (CVE-2012-0879)

Update instructions:

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

Ubuntu 10.04 LTS:
  linux-image-2.6.32-39-386       2.6.32-39.86
  linux-image-2.6.32-39-generic   2.6.32-39.86
  linux-image-2.6.32-39-generic-pae  2.6.32-39.86
  linux-image-2.6.32-39-ia64      2.6.32-39.86
  linux-image-2.6.32-39-lpia      2.6.32-39.86
  linux-image-2.6.32-39-powerpc   2.6.32-39.86
  linux-image-2.6.32-39-powerpc-smp  2.6.32-39.86
  linux-image-2.6.32-39-powerpc64-smp  2.6.32-39.86
  linux-image-2.6.32-39-preempt   2.6.32-39.86
  linux-image-2.6.32-39-server    2.6.32-39.86
  linux-image-2.6.32-39-sparc64   2.6.32-39.86
  linux-image-2.6.32-39-sparc64-smp  2.6.32-39.86
  linux-image-2.6.32-39-versatile  2.6.32-39.86
  linux-image-2.6.32-39-virtual   2.6.32-39.86

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-1389-1
  CVE-2011-4127, CVE-2011-4347, CVE-2011-4622, CVE-2012-0038,
  CVE-2012-0879

Package Information:
  https://launchpad.net/ubuntu/+source/linux/2.6.32-39.86