6.9 - USN-3484-1

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

- Ubuntu 17.04

Summary:

The system could be made to crash or run programs as an administrator.

Software Description: - linux: Linux kernel - linux-raspi2: Linux kernel for Raspberry Pi 2

Details:

It was discovered that the KVM subsystem in the Linux kernel did not properly keep track of nested levels in guest page tables. A local attacker in a guest VM could use this to cause a denial of service (host OS crash) or possibly execute arbitrary code in the host OS.

Update instructions:

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

Ubuntu 17.04:
linux-image-4.10.0-1021-raspi2 4.10.0-1021.24
linux-image-4.10.0-40-generic 4.10.0-40.44
linux-image-4.10.0-40-generic-lpae 4.10.0-40.44
linux-image-4.10.0-40-lowlatency 4.10.0-40.44
linux-image-generic 4.10.0.40.40
linux-image-generic-lpae 4.10.0.40.40
linux-image-lowlatency 4.10.0.40.40
linux-image-raspi2 4.10.0.1021.22

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. Unless you manually uninstalled the standard kernel metapackages (e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual, linux-powerpc), a standard system upgrade will automatically perform this as well.

References:
https://www.ubuntu.com/usn/usn-3484-1
CVE-2017-12188

Package Information:
https://launchpad.net/ubuntu/+source/linux/4.10.0-40.44
https://launchpad.net/ubuntu/+source/linux-raspi2/4.10.0-1021.24