USN-3641-1: Linux kernel vulnerabilities

8 May 2018

linux, linux-aws, linux-azure, linux-euclid, linux-gcp, linux-hwe, linux-kvm, linux-lts-xenial, linux-oem, linux-raspi2, linux-snapdragon vulnerabilities

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 17.10
  • Ubuntu 16.04 LTS
  • Ubuntu 14.04 LTS

Summary

Several security issues were fixed in the Linux kernel.

Software Description

  • linux - Linux kernel
  • linux-raspi2 - Linux kernel for Raspberry Pi 2
  • linux-aws - Linux kernel for Amazon Web Services (AWS) systems
  • linux-azure - Linux kernel for Microsoft Azure Cloud systems
  • linux-euclid - Linux kernel for Intel Euclid systems
  • linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems
  • linux-hwe - Linux hardware enablement (HWE) kernel
  • linux-kvm - Linux kernel for cloud environments
  • linux-oem - Linux kernel for OEM processors
  • linux-snapdragon - Linux kernel for Snapdragon processors
  • linux-lts-xenial - Linux hardware enablement kernel from Xenial for Trusty

Details

Nick Peterson discovered that the Linux kernel did not properly handle debug exceptions following a MOV/POP to SS instruction. A local attacker could use this to cause a denial of service (system crash). This issue only affected the amd64 architecture. (CVE-2018-8897)

Andy Lutomirski discovered that the KVM subsystem of the Linux kernel did not properly emulate the ICEBP instruction following a MOV/POP to SS instruction. A local attacker in a KVM virtual machine could use this to cause a denial of service (guest VM crash) or possibly escalate privileges inside of the virtual machine. This issue only affected the i386 and amd64 architectures. (CVE-2018-1087)

Andy Lutomirski discovered that the Linux kernel did not properly perform error handling on virtualized debug registers. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2018-1000199)

Update instructions

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

Ubuntu 17.10
linux-image-4.13.0-1019-raspi2 - 4.13.0-1019.20
linux-image-4.13.0-41-generic - 4.13.0-41.46
linux-image-4.13.0-41-generic-lpae - 4.13.0-41.46
linux-image-4.13.0-41-lowlatency - 4.13.0-41.46
linux-image-generic - 4.13.0.41.44
linux-image-generic-lpae - 4.13.0.41.44
linux-image-lowlatency - 4.13.0.41.44
linux-image-raspi2 - 4.13.0.1019.17
Ubuntu 16.04 LTS
linux-image-4.13.0-1015-gcp - 4.13.0-1015.19
linux-image-4.13.0-1016-azure - 4.13.0-1016.19
linux-image-4.13.0-1026-oem - 4.13.0-1026.29
linux-image-4.13.0-41-generic - 4.13.0-41.46~16.04.1
linux-image-4.13.0-41-generic-lpae - 4.13.0-41.46~16.04.1
linux-image-4.13.0-41-lowlatency - 4.13.0-41.46~16.04.1
linux-image-4.4.0-1023-kvm - 4.4.0-1023.28
linux-image-4.4.0-1057-aws - 4.4.0-1057.66
linux-image-4.4.0-1089-raspi2 - 4.4.0-1089.97
linux-image-4.4.0-1092-snapdragon - 4.4.0-1092.97
linux-image-4.4.0-124-generic - 4.4.0-124.148
linux-image-4.4.0-124-generic-lpae - 4.4.0-124.148
linux-image-4.4.0-124-lowlatency - 4.4.0-124.148
linux-image-4.4.0-124-powerpc-e500mc - 4.4.0-124.148
linux-image-4.4.0-124-powerpc-smp - 4.4.0-124.148
linux-image-4.4.0-124-powerpc64-emb - 4.4.0-124.148
linux-image-4.4.0-124-powerpc64-smp - 4.4.0-124.148
linux-image-4.4.0-9027-euclid - 4.4.0-9027.29
linux-image-aws - 4.4.0.1057.59
linux-image-azure - 4.13.0.1016.17
linux-image-euclid - 4.4.0.9027.28
linux-image-gcp - 4.13.0.1015.17
linux-image-generic - 4.4.0.124.130
linux-image-generic-hwe-16.04 - 4.13.0.41.60
linux-image-generic-lpae - 4.4.0.124.130
linux-image-generic-lpae-hwe-16.04 - 4.13.0.41.60
linux-image-gke - 4.13.0.1015.17
linux-image-kvm - 4.4.0.1023.22
linux-image-lowlatency - 4.4.0.124.130
linux-image-lowlatency-hwe-16.04 - 4.13.0.41.60
linux-image-oem - 4.13.0.1026.30
linux-image-powerpc-e500mc - 4.4.0.124.130
linux-image-powerpc-smp - 4.4.0.124.130
linux-image-powerpc64-emb - 4.4.0.124.130
linux-image-powerpc64-smp - 4.4.0.124.130
linux-image-raspi2 - 4.4.0.1089.89
linux-image-snapdragon - 4.4.0.1092.84
Ubuntu 14.04 LTS
linux-image-3.13.0-147-generic - 3.13.0-147.196
linux-image-3.13.0-147-generic-lpae - 3.13.0-147.196
linux-image-3.13.0-147-lowlatency - 3.13.0-147.196
linux-image-3.13.0-147-powerpc-e500 - 3.13.0-147.196
linux-image-3.13.0-147-powerpc-e500mc - 3.13.0-147.196
linux-image-3.13.0-147-powerpc-smp - 3.13.0-147.196
linux-image-3.13.0-147-powerpc64-emb - 3.13.0-147.196
linux-image-3.13.0-147-powerpc64-smp - 3.13.0-147.196
linux-image-4.4.0-1019-aws - 4.4.0-1019.19
linux-image-4.4.0-124-generic - 4.4.0-124.148~14.04.1
linux-image-4.4.0-124-generic-lpae - 4.4.0-124.148~14.04.1
linux-image-4.4.0-124-lowlatency - 4.4.0-124.148~14.04.1
linux-image-4.4.0-124-powerpc-e500mc - 4.4.0-124.148~14.04.1
linux-image-4.4.0-124-powerpc-smp - 4.4.0-124.148~14.04.1
linux-image-4.4.0-124-powerpc64-emb - 4.4.0-124.148~14.04.1
linux-image-4.4.0-124-powerpc64-smp - 4.4.0-124.148~14.04.1
linux-image-aws - 4.4.0.1019.19
linux-image-generic - 3.13.0.147.157
linux-image-generic-lpae - 3.13.0.147.157
linux-image-generic-lpae-lts-xenial - 4.4.0.124.104
linux-image-generic-lts-xenial - 4.4.0.124.104
linux-image-generic-pae - 3.13.0.147.157
linux-image-lowlatency - 3.13.0.147.157
linux-image-lowlatency-lts-xenial - 4.4.0.124.104
linux-image-powerpc-e500 - 3.13.0.147.157
linux-image-powerpc-e500mc - 3.13.0.147.157
linux-image-powerpc-e500mc-lts-xenial - 4.4.0.124.104
linux-image-powerpc-smp - 3.13.0.147.157
linux-image-powerpc-smp-lts-xenial - 4.4.0.124.104
linux-image-powerpc64-emb - 3.13.0.147.157
linux-image-powerpc64-emb-lts-xenial - 4.4.0.124.104
linux-image-powerpc64-smp - 3.13.0.147.157
linux-image-powerpc64-smp-lts-xenial - 4.4.0.124.104

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

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