7.2 - USN-1362-1

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:

Han-Wen Nienhuys reported a flaw in the FUSE kernel module. A local user who can mount a FUSE file system could cause a denial of service. (CVE-2011-3353)

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)

Chen Haogang discovered an integer overflow that could result in memory corruption. A local unprivileged user could use this to crash the system. (CVE-2012-0044)

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 2.6.38-13.55
linux-image-2.6.38-13-generic-pae 2.6.38-13.55
linux-image-2.6.38-13-omap 2.6.38-13.55
linux-image-2.6.38-13-powerpc 2.6.38-13.55
linux-image-2.6.38-13-powerpc-smp 2.6.38-13.55
linux-image-2.6.38-13-powerpc64-smp 2.6.38-13.55
linux-image-2.6.38-13-server 2.6.38-13.55
linux-image-2.6.38-13-versatile 2.6.38-13.55
linux-image-2.6.38-13-virtual 2.6.38-13.55

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

References:
http://www.ubuntu.com/usn/usn-1362-1
CVE-2011-3353, CVE-2011-4622, CVE-2012-0038, CVE-2012-0044

Package Information:
https://launchpad.net/ubuntu/+source/linux/2.6.38-13.55