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Ubuntu Security Notice USN-1422-1

Ubuntu Security Notice USN-1422-1
Posted Apr 12, 2012
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 1422-1 - 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 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. Various other issues were also addressed.

tags | advisory, denial of service, kernel, local
systems | linux, ubuntu
advisories | CVE-2011-4347, CVE-2012-0045, CVE-2012-1097, CVE-2012-1146, CVE-2011-4347, CVE-2012-0045, CVE-2012-1097, CVE-2012-1146
MD5 | 80a625bd61690065e71da1f38dee391b

Ubuntu Security Notice USN-1422-1

Change Mirror Download
============================================================================
Ubuntu Security Notice USN-1422-1
April 12, 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 B=C3=A4rwolf 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-2.6.38-14-generic 2.6.38-14.58
linux-image-2.6.38-14-generic-pae 2.6.38-14.58
linux-image-2.6.38-14-omap 2.6.38-14.58
linux-image-2.6.38-14-powerpc 2.6.38-14.58
linux-image-2.6.38-14-powerpc-smp 2.6.38-14.58
linux-image-2.6.38-14-powerpc64-smp 2.6.38-14.58
linux-image-2.6.38-14-server 2.6.38-14.58
linux-image-2.6.38-14-versatile 2.6.38-14.58
linux-image-2.6.38-14-virtual 2.6.38-14.58

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-1422-1
CVE-2011-4347, CVE-2012-0045, CVE-2012-1097, CVE-2012-1146

Package Information:
https://launchpad.net/ubuntu/+source/linux/2.6.38-14.58

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