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=========================================================================Ubuntu Security Notice USN-2803-1
November 10, 2015

linux vulnerability
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 15.10

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.

Update instructions:

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

Ubuntu 15.10:
  linux-image-4.2.0-18-generic    4.2.0-18.22
  linux-image-4.2.0-18-generic-lpae  4.2.0-18.22
  linux-image-4.2.0-18-lowlatency  4.2.0-18.22
  linux-image-4.2.0-18-powerpc-e500mc  4.2.0-18.22
  linux-image-4.2.0-18-powerpc-smp  4.2.0-18.22
  linux-image-4.2.0-18-powerpc64-emb  4.2.0-18.22
  linux-image-4.2.0-18-powerpc64-smp  4.2.0-18.22

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-2803-1
  CVE-2015-5307

Package Information:
  https://launchpad.net/ubuntu/+source/linux/4.2.0-18.22

Ubuntu 2803-1: Linux kernel vulnerability

November 10, 2015
The system could be made to crash under certain conditions.

Summary

Update Instructions

The problem can be corrected by updating your system to the following package versions: Ubuntu 15.10: linux-image-4.2.0-18-generic 4.2.0-18.22 linux-image-4.2.0-18-generic-lpae 4.2.0-18.22 linux-image-4.2.0-18-lowlatency 4.2.0-18.22 linux-image-4.2.0-18-powerpc-e500mc 4.2.0-18.22 linux-image-4.2.0-18-powerpc-smp 4.2.0-18.22 linux-image-4.2.0-18-powerpc64-emb 4.2.0-18.22 linux-image-4.2.0-18-powerpc64-smp 4.2.0-18.22 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-2803-1

CVE-2015-5307

Severity
November 10, 2015

Package Information

https://launchpad.net/ubuntu/+source/linux/4.2.0-18.22

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