USN-1422-1: Linux kernel vulnerabilities

12 April 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 Bärwolf 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

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

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