USN-2462-1: Linux kernel vulnerabilities

13 January 2015

linux vulnerabilities

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

Andy Lutomirski discovered that the Linux kernel does not properly handle faults associated with the Stack Segment (SS) register in the x86 architecture. A local attacker could exploit this flaw to gain administrative privileges. (CVE-2014-9322)

Lars Bull reported a race condition in the PIT (programmable interrupt timer) emulation in the KVM (Kernel Virtual Machine) subsystem of the Linux kernel. A local guest user with access to PIT i/o ports could exploit this flaw to cause a denial of service (crash) on the host. (CVE-2014-3611)

Lars Bull and Nadav Amit reported a flaw in how KVM (the Kernel Virtual Machine) handles noncanonical writes to certain MSR registers. A privileged guest user can exploit this flaw to cause a denial of service (kernel panic) on the host. (CVE-2014-3610)

Update instructions

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

Ubuntu 10.04 LTS
linux-image-2.6.32-71-386 - 2.6.32-71.138
linux-image-2.6.32-71-generic - 2.6.32-71.138
linux-image-2.6.32-71-generic-pae - 2.6.32-71.138
linux-image-2.6.32-71-ia64 - 2.6.32-71.138
linux-image-2.6.32-71-lpia - 2.6.32-71.138
linux-image-2.6.32-71-powerpc - 2.6.32-71.138
linux-image-2.6.32-71-powerpc-smp - 2.6.32-71.138
linux-image-2.6.32-71-powerpc64-smp - 2.6.32-71.138
linux-image-2.6.32-71-preempt - 2.6.32-71.138
linux-image-2.6.32-71-server - 2.6.32-71.138
linux-image-2.6.32-71-sparc64 - 2.6.32-71.138
linux-image-2.6.32-71-sparc64-smp - 2.6.32-71.138
linux-image-2.6.32-71-versatile - 2.6.32-71.138
linux-image-2.6.32-71-virtual - 2.6.32-71.138

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