[USN-1719-1] Linux kernel (Oneiric backport) vulnerabilities

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==========================================================================
Ubuntu Security Notice USN-1719-1
February 12, 2013

linux-lts-backport-oneiric 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-lts-backport-oneiric: Linux kernel backport from Oneiric

Details:

It was discovered that hypervkvpd, which is distributed in the Linux
kernel, was not correctly validating the origin on Netlink messages. An
untrusted local user can cause a denial of service of Linux guests in
Hyper-V virtualization environments. (CVE-2012-2669)

Dmitry Monakhov reported a race condition flaw the Linux ext4 filesystem
that can expose stale data. An unprivileged user could exploit this flaw to
cause an information leak. (CVE-2012-4508)

Andrew Cooper of Citrix reported a Xen stack corruption in the Linux
kernel. An unprivileged user in a 32bit PVOPS guest can cause the guest
kernel to crash, or operate erroneously. (CVE-2013-0190)

Update instructions:

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

Ubuntu 10.04 LTS:
linux-image-3.0.0-31-generic 3.0.0-31.48~lucid1
linux-image-3.0.0-31-generic-pae 3.0.0-31.48~lucid1
linux-image-3.0.0-31-server 3.0.0-31.48~lucid1
linux-image-3.0.0-31-virtual 3.0.0-31.48~lucid1

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-1719-1
CVE-2012-2669, CVE-2012-4508, CVE-2013-0190

Package Information:
https://launchpad.net/ubuntu/+source/linux-lts-backport-oneiric/3.0.0-31.48~lucid1