4.9 - USN-1389-1

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:

Paolo Bonzini discovered a flaw in Linux's handling of the SG_IO ioctl command. A local user, or user in a VM could exploit this flaw to bypass restrictions and gain read/write access to all data on the affected block device. (CVE-2011-4127)

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)

A flaw was found in KVM's Programmable Interval Timer (PIT). When a virtual interrupt control is not available a local user could use this to cause a denial of service by starting a timer. (CVE-2011-4622)

A flaw was discovered in the XFS filesystem. If a local user mounts a specially crafted XFS image it could potential execute arbitrary code on the system. (CVE-2012-0038)

Louis Rilling discovered a flaw in Linux kernel's clone command when CLONE_IO is specified. An unprivileged local user could exploit this to cause a denial of service. (CVE-2012-0879)

Update instructions:

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

Ubuntu 10.04 LTS:
linux-image-2.6.32-39-386 2.6.32-39.86
linux-image-2.6.32-39-generic 2.6.32-39.86
linux-image-2.6.32-39-generic-pae 2.6.32-39.86
linux-image-2.6.32-39-ia64 2.6.32-39.86
linux-image-2.6.32-39-lpia 2.6.32-39.86
linux-image-2.6.32-39-powerpc 2.6.32-39.86
linux-image-2.6.32-39-powerpc-smp 2.6.32-39.86
linux-image-2.6.32-39-powerpc64-smp 2.6.32-39.86
linux-image-2.6.32-39-preempt 2.6.32-39.86
linux-image-2.6.32-39-server 2.6.32-39.86
linux-image-2.6.32-39-sparc64 2.6.32-39.86
linux-image-2.6.32-39-sparc64-smp 2.6.32-39.86
linux-image-2.6.32-39-versatile 2.6.32-39.86
linux-image-2.6.32-39-virtual 2.6.32-39.86

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-1389-1
CVE-2011-4127, CVE-2011-4347, CVE-2011-4622, CVE-2012-0038,
CVE-2012-0879

Package Information:
https://launchpad.net/ubuntu/+source/linux/2.6.32-39.86