USN-3509-3: Linux kernel regression
15 December 2017
linux, linux-aws, linux-kvm, linux-raspi2 regression
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 16.04 LTS
USN-3509-1 introduced a regression in the Linux kernel for Ubuntu 16.04 LTS.
- linux - Linux kernel
- linux-aws - Linux kernel for Amazon Web Services (AWS) systems
- linux-kvm - Linux kernel for cloud environments
- linux-raspi2 - Linux kernel for Raspberry Pi 2
USN-3509-1 fixed vulnerabilities in the Linux kernel for Ubuntu 16.04 LTS. Unfortunately, it also introduced a regression that prevented the Ceph network filesystem from being used. This update fixes the problem.
We apologize for the inconvenience.
Original advisory details:
Mohamed Ghannam discovered that a use-after-free vulnerability existed in the Netlink subsystem (XFRM) in the Linux kernel. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2017-16939)
It was discovered that the Linux kernel did not properly handle copy-on- write of transparent huge pages. A local attacker could use this to cause a denial of service (application crashes) or possibly gain administrative privileges. (CVE-2017-1000405)
Fan Wu, Haoran Qiu, and Shixiong Zhao discovered that the associative array implementation in the Linux kernel sometimes did not properly handle adding a new entry. A local attacker could use this to cause a denial of service (system crash). (CVE-2017-12193)
Andrey Konovalov discovered an out-of-bounds read in the GTCO digitizer USB driver for the Linux kernel. A physically proximate attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2017-16643)
The problem can be corrected by updating your system to the following package versions:
- Ubuntu 16.04 LTS
- linux-image-4.4.0-1013-kvm - 4.4.0-1013.18
- linux-image-4.4.0-104-generic - 4.4.0-104.127
- linux-image-4.4.0-104-generic-lpae - 4.4.0-104.127
- linux-image-4.4.0-104-lowlatency - 4.4.0-104.127
- linux-image-4.4.0-104-powerpc-e500mc - 4.4.0-104.127
- linux-image-4.4.0-104-powerpc-smp - 4.4.0-104.127
- linux-image-4.4.0-104-powerpc64-emb - 4.4.0-104.127
- linux-image-4.4.0-104-powerpc64-smp - 4.4.0-104.127
- linux-image-4.4.0-1044-aws - 4.4.0-1044.53
- linux-image-4.4.0-1080-raspi2 - 4.4.0-1080.88
- linux-image-aws - 188.8.131.524.46
- linux-image-generic - 184.108.40.206.109
- linux-image-generic-lpae - 220.127.116.11.109
- linux-image-kvm - 18.104.22.1683.13
- linux-image-lowlatency - 22.214.171.124.109
- linux-image-powerpc-e500mc - 126.96.36.199.109
- linux-image-powerpc-smp - 188.8.131.52.109
- linux-image-powerpc64-emb - 184.108.40.206.109
- linux-image-powerpc64-smp - 220.127.116.11.109
- linux-image-raspi2 - 18.104.22.1680.80
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.