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USN-3507-2: Linux kernel (GCP) vulnerabilities

8 December 2017

Several security issues were fixed in the Linux kernel.

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Releases

Packages

  • linux-gcp - Linux kernel for Google Cloud Platform (GCP) 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)

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)

Eric Biggers discovered that the key management subsystem in the Linux
kernel did not properly restrict adding a key that already exists but is
uninstantiated. A local attacker could use this to cause a denial of
service (system crash) or possibly execute arbitrary code. (CVE-2017-15299)

It was discovered that a null pointer dereference error existed in the
PowerPC KVM implementation in the Linux kernel. A local attacker could use
this to cause a denial of service (system crash). (CVE-2017-15306)

Eric Biggers discovered a race condition in the key management subsystem of
the Linux kernel around keys in a negative state. A local attacker could
use this to cause a denial of service (system crash) or possibly execute
arbitrary code. (CVE-2017-15951)

Reduce your security exposure

Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

Learn more about Ubuntu Pro

Update instructions

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

Ubuntu 16.04

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.

Related notices

  • USN-3510-1: linux-image-3.13.0-137-lowlatency, linux, linux-image-3.13.0-137-powerpc-smp, linux-image-3.13.0-137-generic-lpae, linux-image-extra-3.13.0-137-generic, linux-image-3.13.0-137-generic, linux-image-3.13.0-137-powerpc64-emb, linux-image-3.13.0-137-powerpc64-smp, linux-image-3.13.0-137-powerpc-e500, linux-image-3.13.0-137-powerpc-e500mc
  • USN-3510-2: linux-image-3.13.0-137-generic-lpae, linux-image-3.13.0-137-generic, linux-lts-trusty, linux-image-generic-lts-trusty, linux-image-generic-lpae-lts-trusty
  • USN-3511-1: linux-azure, linux-image-4.11.0-1016-azure, linux-image-extra-4.11.0-1016-azure
  • USN-3507-1: linux-image-raspi2, linux-image-lowlatency, linux-raspi2, linux, linux-image-4.13.0-19-generic, linux-image-4.13.0-1008-raspi2, linux-image-generic, linux-image-4.13.0-19-lowlatency, linux-image-4.13.0-19-generic-lpae, linux-image-generic-lpae
  • USN-3508-2: linux-image-4.10.0-42-generic, linux-image-extra-4.10.0-42-generic, linux-image-4.10.0-42-generic-lpae, linux-image-4.10.0-42-lowlatency, linux-hwe
  • USN-3509-1: linux-image-4.4.0-103-powerpc64-emb, linux-raspi2, linux-image-4.4.0-1079-raspi2, linux-image-4.4.0-103-generic-lpae, linux-image-4.4.0-103-generic, linux-aws, linux, linux-image-4.4.0-103-powerpc-smp, linux-image-extra-4.4.0-103-generic, linux-snapdragon, linux-image-4.4.0-103-lowlatency, linux-image-4.4.0-103-powerpc-e500mc, linux-image-4.4.0-1081-snapdragon, linux-kvm, linux-image-4.4.0-1012-kvm, linux-image-4.4.0-103-powerpc64-smp, linux-image-4.4.0-1043-aws
  • USN-3509-2: linux-image-4.4.0-103-powerpc64-emb, linux-image-4.4.0-103-generic, linux-aws, linux-image-4.4.0-1005-aws, linux-image-4.4.0-103-generic-lpae, linux-image-4.4.0-103-powerpc-smp, linux-image-extra-4.4.0-103-generic, linux-image-4.4.0-103-lowlatency, linux-image-4.4.0-103-powerpc-e500mc, linux-lts-xenial, linux-image-4.4.0-103-powerpc64-smp
  • USN-3508-1: linux-image-raspi2, linux-image-lowlatency, linux-raspi2, linux-image-4.10.0-1023-raspi2, linux, linux-image-4.10.0-42-generic, linux-image-generic, linux-image-generic-lpae, linux-image-4.10.0-42-generic-lpae, linux-image-4.10.0-42-lowlatency
  • USN-3698-2: linux-image-3.13.0-153-generic, linux-image-3.13.0-153-generic-lpae, linux-lts-trusty, linux-image-generic-lts-trusty, linux-image-generic-lpae-lts-trusty
  • USN-3698-1: linux-image-3.13.0-153-powerpc64-emb, linux, linux-image-3.13.0-153-generic, linux-image-3.13.0-153-powerpc-e500, linux-image-3.13.0-153-powerpc-smp, linux-image-3.13.0-153-generic-lpae, linux-image-3.13.0-153-lowlatency, linux-image-3.13.0-153-powerpc64-smp, linux-image-extra-3.13.0-153-generic, linux-image-3.13.0-153-powerpc-e500mc
  • USN-3798-1: linux-image-3.13.0-161-generic-lpae, linux, linux-image-extra-3.13.0-161-generic, linux-image-3.13.0-161-generic, linux-image-3.13.0-161-powerpc-e500mc, linux-image-3.13.0-161-powerpc-smp, linux-image-3.13.0-161-powerpc-e500, linux-image-3.13.0-161-powerpc64-smp, linux-image-3.13.0-161-lowlatency, linux-image-3.13.0-161-powerpc64-emb
  • USN-3798-2: linux-image-3.13.0-161-generic-lpae, linux-image-3.13.0-161-generic, linux-lts-trusty, linux-image-generic-lts-trusty, linux-image-generic-lpae-lts-trusty
  • USN-3485-1: linux, linux-image-4.4.0-1079-snapdragon, linux-image-4.4.0-101-powerpc-e500mc, linux-image-extra-4.4.0-1034-gke, linux-image-4.4.0-1077-raspi2, linux-image-extra-4.4.0-101-generic, linux-image-4.4.0-1034-gke, linux-image-4.4.0-101-generic, linux-image-4.4.0-101-powerpc64-emb, linux-image-4.4.0-1041-aws, linux-image-4.4.0-101-lowlatency, linux-aws, linux-gke, linux-image-4.4.0-101-powerpc64-smp, linux-raspi2, linux-image-4.4.0-1010-kvm, linux-kvm, linux-image-4.4.0-101-generic-lpae, linux-snapdragon, linux-image-4.4.0-101-powerpc-smp
  • USN-3485-3: linux-image-4.4.0-1003-aws, linux-aws
  • USN-3485-2: linux-image-4.4.0-101-lowlatency, linux-image-4.4.0-101-powerpc64-emb, linux-image-4.4.0-101-powerpc64-smp, linux-image-extra-4.4.0-101-generic, linux-image-4.4.0-101-generic, linux-lts-xenial, linux-image-4.4.0-101-generic-lpae, linux-image-4.4.0-101-powerpc-e500mc, linux-image-4.4.0-101-powerpc-smp