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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)

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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.

References

Related notices

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

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Further reading