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Ubuntu: New Linux packages fix security vulnerabilities

Sasha Levin discovered a flaw in the permission checking for device assignments requested via the kvm ioctl. A local user could use this flaw to crash the system causing a denial of service. Stephan Bärwolf discovered a flaw in the KVM (kernel-based virtual machine) subsystem. A local unprivileged user can crash use this flaw to crash VMs causing a deny of service. A flaw was discovered cifs file system. An unprivileged local user could exploit this flaw to crash the system leading to a denial of service.

H. Peter Anvin reported a flaw that could crash the system. A local user could exploit this flaw to crash the system.

Updated packages are available from security.ubuntu.com.

==========================================================================
Ubuntu Security Notice USN-1425-1
April 24, 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:

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)

Stephan Bärwolf discovered a flaw in the KVM (kernel-based virtual
machine) subsystem of the Linux kernel. A local unprivileged user can crash
use this flaw to crash VMs causing a deny of service. (CVE-2012-0045)

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)

H. Peter Anvin reported a flaw in the Linux kernel that could crash the
system. A local user could exploit this flaw to crash the system.
(CVE-2012-1097)

Update instructions:

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

Ubuntu 10.04 LTS:
 linux-image-2.6.32-41-386       2.6.32-41.88
 linux-image-2.6.32-41-generic   2.6.32-41.88
 linux-image-2.6.32-41-generic-pae  2.6.32-41.88
 linux-image-2.6.32-41-ia64      2.6.32-41.88
 linux-image-2.6.32-41-lpia      2.6.32-41.88
 linux-image-2.6.32-41-powerpc   2.6.32-41.88
 linux-image-2.6.32-41-powerpc-smp  2.6.32-41.88
 linux-image-2.6.32-41-powerpc64-smp  2.6.32-41.88
 linux-image-2.6.32-41-preempt   2.6.32-41.88
 linux-image-2.6.32-41-server    2.6.32-41.88
 linux-image-2.6.32-41-sparc64   2.6.32-41.88
 linux-image-2.6.32-41-sparc64-smp  2.6.32-41.88
 linux-image-2.6.32-41-versatile  2.6.32-41.88
 linux-image-2.6.32-41-virtual   2.6.32-41.88

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-1425-1
 CVE-2011-4347, CVE-2012-0045, CVE-2012-1090, CVE-2012-1097

Package Information:
 https://launchpad.net/ubuntu/+source/linux/2.6.32-41.88
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