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Ubuntu: Security update for the Linux kernel

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. 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. Florian Weimer discovered that hypervkvpd, which is distributed in the Linux kernel, was not correctly validating source addresses of netlink packets. An untrusted local user can cause a denial of service by causing hypervkvpd to exit.

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.

Updated packages are available from security.ubuntu.com.

Ubuntu Security Notice USN-1720-1
February 12, 2013

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

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

- Ubuntu 11.10

Summary:

Several security issues were fixed in the kernel.

Software Description:
- linux: Linux kernel

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)

Florian Weimer discovered that hypervkvpd, which is distributed in the
Linux kernel, was not correctly validating source addresses of netlink
packets. An untrusted local user can cause a denial of service by causing
hypervkvpd to exit. (CVE-2012-5532)

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 11.10:
 linux-image-3.0.0-31-generic    3.0.0-31.48
 linux-image-3.0.0-31-generic-pae  3.0.0-31.48
 linux-image-3.0.0-31-omap       3.0.0-31.48
 linux-image-3.0.0-31-powerpc    3.0.0-31.48
 linux-image-3.0.0-31-powerpc-smp  3.0.0-31.48
 linux-image-3.0.0-31-powerpc64-smp  3.0.0-31.48
 linux-image-3.0.0-31-server     3.0.0-31.48
 linux-image-3.0.0-31-virtual    3.0.0-31.48

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-1720-1
 CVE-2012-2669, CVE-2012-4508, CVE-2012-5532, CVE-2013-0190

Package Information:
 https://launchpad.net/ubuntu/+source/linux/3.0.0-31.48
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