Overly broad permissions can turn one compromised account into a much larger security problem. Learn how to reduce unnecessary access, review privileges, and apply least privilege across modern Linux systems. Review Linux Privileges×

Alerts This Week
Warning Icon 1 461
Alerts This Week
Warning Icon 1 461

Ubuntu 12.04 LTS: 2800-1 Critical: Kernel Crash From KVM Error

ubuntu
Calendar Grey November 10, 2015
Scroller Ubuntu
Important Ubuntu Security Announcement regarding a Kernel Crash Vulnerability impacting LTS versions, provides steps for applying necessary updates.
The system could be made to crash under certain conditions.

Summary

The system could be made to crash under certain conditions.

Software Description:

- linux: Linux kernel

Details:

Ben Serebrin discovered that the KVM hypervisor implementation in the Linux

kernel did not properly catch Alignment Check exceptions. An attacker in a

guest virtual machine could use this to cause a denial of service (system

crash) in the host OS.

Topics%20covered

Topics Covered

security advisory denial of service critical ubuntu linux kernel crash kvm error

Update Instructions

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

Ubuntu 12.04 LTS:
  linux-image-3.2.0-94-generic    3.2.0-94.134
  linux-image-3.2.0-94-generic-pae  3.2.0-94.134
  linux-image-3.2.0-94-highbank   3.2.0-94.134
  linux-image-3.2.0-94-omap       3.2.0-94.134
  linux-image-3.2.0-94-powerpc-smp  3.2.0-94.134
  linux-image-3.2.0-94-powerpc64-smp  3.2.0-94.134
  linux-image-3.2.0-94-virtual    3.2.0-94.134

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

https://ubuntu.com/security/notices/USN-2800-1

CVE-2015-5307

Severity
critical
Lowest
Low
Medium
High
Critical

November 10, 2015

Topics%20covered

Topics Covered

security advisory denial of service critical ubuntu linux kernel crash kvm error

Package Information

https://launchpad.net/ubuntu/+source/linux/3.2.0-94.134

Get the latest News and Insights

Get the latest Linux and open source security news straight to your inbox.