USN-4096-1: Linux kernel (AWS) vulnerability

13 August 2019

The system could be made to expose sensitive information.

Releases

Packages

  • linux-aws - Linux kernel for Amazon Web Services (AWS) systems
  • linux-aws-hwe - Linux kernel for Amazon Web Services (AWS-HWE) systems

Details

Andrei Vlad Lutas and Dan Lutas discovered that some x86 processors
incorrectly handle SWAPGS instructions during speculative execution. A
local attacker could use this to expose sensitive information (kernel
memory).

Update instructions

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

Ubuntu 19.04
Ubuntu 18.04
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-4093-1: linux-image-generic-lpae-hwe-18.04, linux-gcp, linux-image-lowlatency-hwe-18.04, linux-image-kvm, linux-image-raspi2, linux-image-generic, linux-image-5.0.0-1014-raspi2, linux-image-5.0.0-25-generic, linux-hwe, linux-image-gcp, linux-raspi2, linux-snapdragon, linux-image-snapdragon, linux-image-virtual, linux, linux-image-azure, linux-image-snapdragon-hwe-18.04, linux-image-lowlatency, linux-image-virtual-hwe-18.04, linux-image-5.0.0-1018-snapdragon, linux-image-5.0.0-25-lowlatency, linux-image-gke, linux-image-5.0.0-25-generic-lpae, linux-image-5.0.0-1014-azure, linux-image-5.0.0-1013-gcp, linux-image-5.0.0-1013-kvm, linux-azure, linux-image-generic-lpae, linux-image-generic-hwe-18.04, linux-kvm
  • USN-4094-1: linux-gcp, linux-image-virtual-hwe-16.04, linux-image-kvm, linux-image-raspi2, linux-image-generic, linux-hwe, linux-image-gcp, linux-raspi2, linux-image-4.15.0-1060-snapdragon, linux-snapdragon, linux-image-snapdragon, linux-image-4.15.0-1042-kvm, linux-image-4.15.0-1021-oracle, linux-image-oracle, linux-image-virtual, linux-image-generic-lpae-hwe-16.04, linux-image-gke-4.15, linux, linux-image-4.15.0-58-generic, linux-image-4.15.0-1043-raspi2, linux-image-4.15.0-1050-oem, linux-image-lowlatency, linux-image-lowlatency-hwe-16.04-edge, linux-image-4.15.0-58-lowlatency, linux-oracle, linux-image-gke, linux-image-lowlatency-hwe-16.04, linux-image-generic-lpae-hwe-16.04-edge, linux-image-4.15.0-1040-gcp, linux-azure, linux-image-4.15.0-1040-gke, linux-image-virtual-hwe-16.04-edge, linux-gke-4.15, linux-image-generic-hwe-16.04-edge, linux-image-generic-lpae, linux-image-generic-hwe-16.04, linux-image-oem, linux-image-4.15.0-58-generic-lpae, linux-kvm, linux-oem
  • USN-4095-1: linux-image-powerpc-smp-lts-wily, linux-image-powerpc-smp-lts-utopic, linux-image-powerpc64-smp-lts-wily, linux-image-powerpc-e500mc-lts-wily, linux-image-4.4.0-159-powerpc-smp, linux-image-aws, linux-image-4.4.0-1122-snapdragon, linux-image-lowlatency-lts-wily, linux-image-kvm, linux-image-raspi2, linux-image-4.4.0-159-generic-lpae, linux-image-generic, linux-image-4.4.0-159-powerpc-e500mc, linux-image-powerpc-smp-lts-xenial, linux-image-powerpc64-smp-lts-vivid, linux-raspi2, linux-image-powerpc-e500mc, linux-snapdragon, linux-image-snapdragon, linux-image-virtual, linux-image-virtual-lts-wily, linux-image-4.4.0-159-powerpc64-emb, linux-image-generic-lpae-lts-utopic, linux-image-powerpc64-smp-lts-utopic, linux, linux-image-generic-lpae-lts-xenial, linux-image-4.4.0-1118-raspi2, linux-image-generic-lts-utopic, linux-image-powerpc64-emb-lts-xenial, linux-image-lowlatency-lts-utopic, linux-image-powerpc-e500mc-lts-xenial, linux-aws, linux-image-lowlatency, linux-image-4.4.0-1090-aws, linux-image-generic-lpae-lts-vivid, linux-image-lowlatency-lts-xenial, linux-image-generic-lts-wily, linux-image-powerpc-e500mc-lts-vivid, linux-image-powerpc64-emb, linux-image-powerpc64-emb-lts-utopic, linux-image-generic-lts-xenial, linux-kvm, linux-image-generic-lpae-lts-wily, linux-image-powerpc64-smp, linux-image-4.4.0-159-generic, linux-image-4.4.0-159-powerpc64-smp, linux-image-4.4.0-159-lowlatency, linux-image-virtual-lts-vivid, linux-image-generic-lpae, linux-image-lowlatency-lts-vivid, linux-image-virtual-lts-utopic, linux-image-virtual-lts-xenial, linux-image-powerpc64-emb-lts-vivid, linux-image-powerpc64-smp-lts-xenial, linux-image-powerpc-smp, linux-image-4.4.0-1054-kvm, linux-image-generic-lts-vivid, linux-image-powerpc64-emb-lts-wily, linux-image-powerpc-e500mc-lts-utopic, linux-image-powerpc-smp-lts-vivid
  • USN-4095-2: linux-image-4.4.0-159-powerpc-smp, linux-image-aws, linux-image-powerpc-smp-lts-xenial, linux-image-4.4.0-159-generic-lpae, linux-image-4.4.0-159-powerpc-e500mc, linux-image-4.4.0-159-powerpc64-emb, linux-image-generic-lpae-lts-xenial, linux-image-powerpc64-emb-lts-xenial, linux-image-powerpc-e500mc-lts-xenial, linux-aws, linux-image-lowlatency-lts-xenial, linux-image-generic-lts-xenial, linux-image-4.4.0-159-generic, linux-image-4.4.0-159-powerpc64-smp, linux-image-4.4.0-159-lowlatency, linux-image-4.4.0-1050-aws, linux-image-virtual-lts-xenial, linux-image-powerpc64-smp-lts-xenial, linux-lts-xenial