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==========================================================================
Ubuntu Security Notice USN-1380-1
February 29, 2012

linux vulnerabilities
==========================================================================

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

- Ubuntu 11.04

Summary:

Several security issues were fixed in the kernel.

Software Description:
- linux: Linux kernel

Details:

The linux kernel did not properly account for PTE pages when deciding which
task to kill in out of memory conditions. A local, unprivileged could
exploit this flaw to cause a denial of service. (CVE-2011-2498)

A flaw was discovered in the TOMOYO LSM's handling of mount system calls.
An unprivileged user could oops the system causing a denial of service.
(CVE-2011-2518)

A bug was discovered in the Linux kernel's calculation of OOM (Out of
memory) scores, that would result in the wrong process being killed. A user
could use this to kill the process with the highest OOM score, even if that
process belongs to another user or the system. (CVE-2011-4097)

A flaw was found in the linux kernels IPv4 IGMP query processing. A remote
attacker could exploit this to cause a denial of service. (CVE-2012-0207)

Update instructions:

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

Ubuntu 11.04:
  linux-image-2.6.38-13-generic   2.6.38-13.56
  linux-image-2.6.38-13-generic-pae  2.6.38-13.56
  linux-image-2.6.38-13-omap      2.6.38-13.56
  linux-image-2.6.38-13-powerpc   2.6.38-13.56
  linux-image-2.6.38-13-powerpc-smp  2.6.38-13.56
  linux-image-2.6.38-13-powerpc64-smp  2.6.38-13.56
  linux-image-2.6.38-13-server    2.6.38-13.56
  linux-image-2.6.38-13-versatile  2.6.38-13.56
  linux-image-2.6.38-13-virtual   2.6.38-13.56

After a standard system update you need to reboot your computer to make
all the necessary changes.

References:
  http://www.ubuntu.com/usn/usn-1380-1
  CVE-2011-2498, CVE-2011-2518, CVE-2011-4097, CVE-2012-0207

Package Information:
  https://launchpad.net/ubuntu/+source/linux/2.6.38-13.56

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