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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 in the Linux kernel. 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 of the Linux kernel. A local unprivileged user can crash use this flaw to crash VMs causing a deny of service. 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.

A flaw was discovered in the Linux kernel’s cgroups subset. A local attacker could use this flaw to crash the system.

Updated packages are available from security.ubuntu.com.

==========================================================================
Ubuntu Security Notice USN-1406-1
March 27, 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:

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)

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)

A flaw was discovered in the Linux kernel's cgroups subset. A local
attacker could use this flaw to crash the system. (CVE-2012-1146)

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   2.6.38-13.57
 linux-image-2.6.38-13-generic-pae  2.6.38-13.57
 linux-image-2.6.38-13-omap      2.6.38-13.57
 linux-image-2.6.38-13-powerpc   2.6.38-13.57
 linux-image-2.6.38-13-powerpc-smp  2.6.38-13.57
 linux-image-2.6.38-13-powerpc64-smp  2.6.38-13.57
 linux-image-2.6.38-13-server    2.6.38-13.57
 linux-image-2.6.38-13-versatile  2.6.38-13.57
 linux-image-2.6.38-13-virtual   2.6.38-13.57

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

References:
 http://www.ubuntu.com/usn/usn-1406-1
 CVE-2011-4347, CVE-2012-0045, CVE-2012-1097, CVE-2012-1146

Package Information:
 https://launchpad.net/ubuntu/+source/linux/2.6.38-13.57
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