7.8 - USN-1364-1

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-ti-omap4: Linux kernel for OMAP4

Details:

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)

Andy Whitcroft discovered a that the Overlayfs filesystem was not doing the extended permission checks needed by cgroups and Linux Security Modules (LSMs). A local user could exploit this to by-pass security policy and access files that should not be accessible. (CVE-2012-0055)

Jüri Aedla discovered that the kernel incorrectly handled /proc//mem permissions. A local attacker could exploit this and gain root privileges. (CVE-2012-0056)

A flaw was found in the linux kernels IPv4 IGMP query processing. A remote attacker could exploit this to cause a denial of service. (CVE-2012-0207)

Update instructions:

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

Ubuntu 11.10:
linux-image-3.0.0-1207-omap4 3.0.0-1207.16

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-1364-1
CVE-2012-0038, CVE-2012-0055, CVE-2012-0056, CVE-2012-0207

Package Information:
https://launchpad.net/ubuntu/+source/linux-ti-omap4/3.0.0-1207.16