[USN-1432-1] Linux kernel vulnerabilities

[John Johansen]

==========================================================================
Ubuntu Security Notice USN-1432-1
May 08, 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:

A flaw was found in the Linux's kernels ext4 file system when mounted with
a journal. A local, unprivileged user could exploit this flaw to cause a
denial of service. (CVE-2011-4086)

A flaw was discovered in the Linux kernel's cifs file system. An
unprivileged local user could exploit this flaw to crash the system leading
to a denial of service. (CVE-2012-1090)

A flaw was found in the Linux kernel's ext4 file system when mounting a
corrupt filesystem. A user-assisted remote attacker could exploit this flaw
to cause a denial of service. (CVE-2012-2100)

Update instructions:

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

Ubuntu 11.04:
  linux-image-2.6.38-15-generic   2.6.38-15.59
  linux-image-2.6.38-15-generic-pae  2.6.38-15.59
  linux-image-2.6.38-15-omap      2.6.38-15.59
  linux-image-2.6.38-15-powerpc   2.6.38-15.59
  linux-image-2.6.38-15-powerpc-smp  2.6.38-15.59
  linux-image-2.6.38-15-powerpc64-smp  2.6.38-15.59
  linux-image-2.6.38-15-server    2.6.38-15.59
  linux-image-2.6.38-15-versatile  2.6.38-15.59
  linux-image-2.6.38-15-virtual   2.6.38-15.59

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-1432-1
  CVE-2011-4086, CVE-2012-1090, CVE-2012-2100

Package Information:
  https://launchpad.net/ubuntu/+source/linux/2.6.38-15.59

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