USN-3848-1: Linux kernel vulnerabilities

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
• linux-snapdragon - Linux kernel for Snapdragon processors

Details

It was discovered that a double free existed in the AMD GPIO driver in the
Linux kernel. A local attacker could use this to cause a denial of service
(system crash) or possibly execute arbitrary code. (CVE-2017-18174)

It was discovered that an integer overrun vulnerability existed in the
POSIX timers implementation in the Linux kernel. A local attacker could use
this to cause a denial of service. (CVE-2018-12896)

Kanda Motohiro discovered that writing extended attributes to an XFS file
system in the Linux kernel in certain situations could cause an error
condition to occur. A local attacker could use this to cause a denial of
service. (CVE-2018-18690)

It was discovered that an integer overflow vulnerability existed in the
CDROM driver of the Linux kernel. A local attacker could use this to expose
sensitive information (kernel memory). (CVE-2018-18710)

Update instructions

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

Ubuntu 16.04

• linux-image-4.4.0-1039-kvm - 4.4.0-1039.45
• linux-image-4.4.0-1074-aws - 4.4.0-1074.84
• linux-image-4.4.0-1102-raspi2 - 4.4.0-1102.110
• linux-image-4.4.0-1106-snapdragon - 4.4.0-1106.111
• linux-image-4.4.0-141-generic - 4.4.0-141.167
• linux-image-4.4.0-141-generic-lpae - 4.4.0-141.167
• linux-image-4.4.0-141-lowlatency - 4.4.0-141.167
• linux-image-4.4.0-141-powerpc-e500mc - 4.4.0-141.167
• linux-image-4.4.0-141-powerpc-smp - 4.4.0-141.167
• linux-image-4.4.0-141-powerpc64-emb - 4.4.0-141.167
• linux-image-4.4.0-141-powerpc64-smp - 4.4.0-141.167

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-2017-18174
• CVE-2018-12896
• CVE-2018-18690
• CVE-2018-18710

Related notices

• USN-3848-2: linux-image-4.4.0-1037-aws, linux-image-extra-4.4.0-141-generic, linux-image-4.4.0-141-powerpc64-emb, linux-aws, linux-image-4.4.0-141-generic-lpae, linux-image-4.4.0-141-generic, linux-image-4.4.0-141-lowlatency, linux-lts-xenial, linux-image-4.4.0-141-powerpc64-smp, linux-image-4.4.0-141-powerpc-smp, linux-image-4.4.0-141-powerpc-e500mc
• USN-3847-2: linux-image-4.15.0-1031-aws, linux-image-4.15.0-43-generic-lpae, linux-hwe, linux-gcp, linux-azure, linux-image-unsigned-4.15.0-43-lowlatency, linux-image-unsigned-4.15.0-1026-gcp, linux-image-4.15.0-43-lowlatency, linux-aws-hwe, linux-image-unsigned-4.15.0-43-generic, linux-image-unsigned-4.15.0-1036-azure, linux-image-4.15.0-43-generic
• USN-3847-3: linux-image-unsigned-4.15.0-1036-azure, linux-azure
• USN-3847-1: linux, linux-image-4.15.0-1030-raspi2, linux-image-unsigned-4.15.0-43-generic, linux-raspi2, linux-azure, linux-image-unsigned-4.15.0-1026-gcp, linux-image-unsigned-4.15.0-1030-oem, linux-image-4.15.0-43-lowlatency, linux-image-4.15.0-1031-aws, linux-image-4.15.0-1028-kvm, linux-gcp, linux-image-4.15.0-43-snapdragon, linux-image-unsigned-4.15.0-1036-azure, linux-image-4.15.0-43-generic-lpae, linux-kvm, linux-image-unsigned-4.15.0-43-lowlatency, linux-aws, linux-oem, linux-image-4.15.0-43-generic
• USN-3849-2: linux-image-generic-lpae-lts-trusty, linux-image-3.13.0-164-generic, linux-image-3.13.0-164-generic-lpae, linux-lts-trusty, linux-image-generic-lts-trusty
• USN-3849-1: linux-image-3.13.0-164-powerpc-smp, linux-image-3.13.0-164-powerpc-e500mc, linux-image-3.13.0-164-powerpc-e500, linux, linux-image-3.13.0-164-generic, linux-image-3.13.0-164-generic-lpae, linux-image-3.13.0-164-powerpc64-smp, linux-image-3.13.0-164-lowlatency, linux-image-extra-3.13.0-164-generic, linux-image-3.13.0-164-powerpc64-emb
• USN-3846-1: linux-image-kvm, linux-image-4.18.0-13-lowlatency, linux-image-4.18.0-1006-kvm, linux, linux-image-4.18.0-13-generic-lpae, linux-image-4.18.0-13-generic, linux-raspi2, linux-image-4.18.0-1005-gcp, linux-image-4.18.0-1007-azure, linux-azure, linux-image-lowlatency, linux-image-snapdragon, linux-image-generic-lpae, linux-image-azure, linux-gcp, linux-image-4.18.0-13-snapdragon, linux-image-generic, linux-image-4.18.0-1007-aws, linux-image-4.18.0-1008-raspi2, linux-image-raspi2, linux-image-gcp, linux-image-aws, linux-kvm, linux-aws, linux-image-gke