USN-3511-1: Linux kernel (Azure) vulnerabilities

Releases

• Ubuntu 16.04 ESM

Packages

• linux-azure - Linux kernel for Microsoft Azure Cloud systems

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)

Update instructions

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

Ubuntu 16.04

• linux-image-4.11.0-1016-azure - 4.11.0-1016.16

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

• CVE-2017-1000405
• CVE-2017-16939

Related notices

• USN-3510-1: linux-image-extra-3.13.0-137-generic, linux-image-3.13.0-137-lowlatency, linux-image-3.13.0-137-powerpc-e500, linux-image-3.13.0-137-generic, linux-image-3.13.0-137-powerpc64-emb, linux-image-3.13.0-137-powerpc-smp, linux-image-3.13.0-137-generic-lpae, linux-image-3.13.0-137-powerpc-e500mc, linux, linux-image-3.13.0-137-powerpc64-smp
• USN-3510-2: linux-image-generic-lpae-lts-trusty, linux-image-generic-lts-trusty, linux-image-3.13.0-137-generic, linux-image-3.13.0-137-generic-lpae, linux-lts-trusty
• USN-3507-1: linux-image-4.13.0-19-generic, linux-image-4.13.0-1008-raspi2, linux-image-4.13.0-19-lowlatency, linux-image-generic, linux-raspi2, linux-image-4.13.0-19-generic-lpae, linux-image-raspi2, linux, linux-image-generic-lpae, linux-image-lowlatency
• USN-3508-2: linux-image-4.10.0-42-lowlatency, linux-image-4.10.0-42-generic, linux-hwe, linux-image-extra-4.10.0-42-generic, linux-image-4.10.0-42-generic-lpae
• USN-3507-2: linux-image-4.13.0-1002-gcp, linux-gcp, linux-image-extra-4.13.0-1002-gcp
• USN-3509-1: linux-aws, linux-image-4.4.0-1012-kvm, linux-image-4.4.0-1043-aws, linux-image-4.4.0-103-lowlatency, linux-image-4.4.0-103-powerpc64-smp, linux-image-4.4.0-1079-raspi2, linux-image-4.4.0-103-generic, linux-image-4.4.0-103-powerpc-smp, linux-image-4.4.0-1081-snapdragon, linux-image-4.4.0-103-powerpc-e500mc, linux-snapdragon, linux-image-4.4.0-103-powerpc64-emb, linux-raspi2, linux-kvm, linux-image-extra-4.4.0-103-generic, linux, linux-image-4.4.0-103-generic-lpae
• USN-3509-2: linux-aws, linux-image-4.4.0-1005-aws, linux-image-4.4.0-103-lowlatency, linux-image-4.4.0-103-powerpc64-smp, linux-image-4.4.0-103-generic, linux-image-4.4.0-103-powerpc-smp, linux-lts-xenial, linux-image-4.4.0-103-powerpc-e500mc, linux-image-4.4.0-103-powerpc64-emb, linux-image-extra-4.4.0-103-generic, linux-image-4.4.0-103-generic-lpae
• USN-3508-1: linux-image-4.10.0-1023-raspi2, linux-image-4.10.0-42-lowlatency, linux-image-4.10.0-42-generic, linux-image-generic, linux-raspi2, linux-image-4.10.0-42-generic-lpae, linux-image-raspi2, linux, linux-image-generic-lpae, linux-image-lowlatency