7.1 - USN-1432-1

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:

A flaw was found in the Linux's kernels ext4 file system when mounted with a journal. A local, unprivileged user could exploit this flaw to cause a denial of service. (CVE-2011-4086)

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)

A flaw was found in the Linux kernel's ext4 file system when mounting a corrupt filesystem. A user-assisted remote attacker could exploit this flaw to cause a denial of service. (CVE-2012-2100)

Update instructions:

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

Ubuntu 11.04:
linux-image-2.6.38-15-generic 2.6.38-15.59
linux-image-2.6.38-15-generic-pae 2.6.38-15.59
linux-image-2.6.38-15-omap 2.6.38-15.59
linux-image-2.6.38-15-powerpc 2.6.38-15.59
linux-image-2.6.38-15-powerpc-smp 2.6.38-15.59
linux-image-2.6.38-15-powerpc64-smp 2.6.38-15.59
linux-image-2.6.38-15-server 2.6.38-15.59
linux-image-2.6.38-15-versatile 2.6.38-15.59
linux-image-2.6.38-15-virtual 2.6.38-15.59

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-1432-1
CVE-2011-4086, CVE-2012-1090, CVE-2012-2100

Package Information:
https://launchpad.net/ubuntu/+source/linux/2.6.38-15.59