USN-3484-1: Linux kernel vulnerability
21 November 2017
linux, linux-raspi2 vulnerability
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 17.04
The system could be made to crash or run programs as an administrator.
- linux - Linux kernel
- linux-raspi2 - Linux kernel for Raspberry Pi 2
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.
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 - 126.96.36.199.40
- linux-image-generic-lpae - 188.8.131.52.40
- linux-image-lowlatency - 184.108.40.206.40
- linux-image-raspi2 - 220.127.116.111.22
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. 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.