USN-3509-3: Linux kernel regression

Releases

• Ubuntu 16.04 ESM

Packages

• 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

Details

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)

Update instructions

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

Ubuntu 16.04

• 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

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://launchpad.net/bugs/1737033