USN-4006-1: Linux kernel vulnerability

Releases

• Ubuntu 18.10

Packages

• linux - Linux kernel
• linux-aws - Linux kernel for Amazon Web Services (AWS) systems
• linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems
• linux-kvm - Linux kernel for cloud environments
• linux-raspi2 - Linux kernel for Raspberry Pi 2

Details

Federico Manuel Bento discovered that the Linux kernel did not properly
apply Address Space Layout Randomization (ASLR) in some situations for
setuid a.out binaries. A local attacker could use this to improve the
chances of exploiting an existing vulnerability in a setuid a.out binary.

As a hardening measure, this update disables a.out support.

Update instructions

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

Ubuntu 18.10

• linux-image-gke - 4.18.0.1012.12
• linux-image-4.18.0-21-lowlatency - 4.18.0-21.22
• linux-image-4.18.0-21-snapdragon - 4.18.0-21.22
• linux-image-4.18.0-1017-aws - 4.18.0-1017.19
• linux-image-generic - 4.18.0.21.22
• linux-image-gcp - 4.18.0.1012.12
• linux-image-4.18.0-1012-gcp - 4.18.0-1012.13
• linux-image-4.18.0-1013-kvm - 4.18.0-1013.13
• linux-image-4.18.0-21-generic - 4.18.0-21.22
• linux-image-4.18.0-1015-raspi2 - 4.18.0-1015.17
• linux-image-generic-lpae - 4.18.0.21.22
• linux-image-snapdragon - 4.18.0.21.22
• linux-image-aws - 4.18.0.1017.17
• linux-image-kvm - 4.18.0.1013.13
• linux-image-4.18.0-21-generic-lpae - 4.18.0-21.22
• linux-image-lowlatency - 4.18.0.21.22
• linux-image-raspi2 - 4.18.0.1015.12

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-2019-11191

Related notices

• USN-4008-1: linux-image-aws, linux-image-virtual-lts-wily, linux-image-4.4.0-150-generic-lpae, linux-image-snapdragon, linux-kvm, linux-image-raspi2, linux-image-powerpc64-smp, linux-image-powerpc64-emb-lts-wily, linux-image-powerpc-smp-lts-utopic, linux-image-4.4.0-1084-aws, linux-image-powerpc-e500mc-lts-vivid, linux-raspi2, linux-image-generic-lpae-lts-vivid, linux-image-generic, linux-image-powerpc64-emb, linux-image-generic-lpae-lts-utopic, linux-image-powerpc64-smp-lts-wily, linux-image-4.4.0-1110-raspi2, linux-image-generic-lpae-lts-xenial, linux-image-4.4.0-150-generic, linux-image-lowlatency-lts-vivid, linux-image-powerpc64-smp-lts-xenial, linux-image-4.4.0-1114-snapdragon, linux-image-powerpc-smp-lts-vivid, linux-image-lowlatency, linux-image-powerpc-e500mc, linux-image-powerpc64-smp-lts-utopic, linux-image-4.4.0-150-powerpc-e500mc, linux-image-4.4.0-150-lowlatency, linux-image-lowlatency-lts-xenial, linux-image-powerpc64-smp-lts-vivid, linux-image-virtual-lts-utopic, linux-image-virtual-lts-xenial, linux-image-4.4.0-150-powerpc-smp, linux-image-virtual-lts-vivid, linux-image-powerpc-smp, linux-image-powerpc64-emb-lts-vivid, linux-image-lowlatency-lts-wily, linux-image-generic-lts-vivid, linux-image-powerpc-smp-lts-wily, linux-image-powerpc-smp-lts-xenial, linux-image-4.4.0-150-powerpc64-emb, linux-image-generic-lts-wily, linux-image-powerpc-e500mc-lts-utopic, linux-image-generic-lpae, linux-image-lowlatency-lts-utopic, linux-image-powerpc-e500mc-lts-xenial, linux-image-4.4.0-1047-kvm, linux-image-generic-lts-xenial, linux-image-4.4.0-150-powerpc64-smp, linux-aws, linux-image-generic-lpae-lts-wily, linux-image-generic-lts-utopic, linux-image-powerpc-e500mc-lts-wily, linux, linux-image-powerpc64-emb-lts-utopic, linux-image-powerpc64-emb-lts-xenial, linux-snapdragon, linux-image-virtual, linux-image-kvm
• USN-4007-1: linux-image-aws, linux-image-4.15.0-1033-gcp, linux-image-snapdragon, linux-kvm, linux-image-raspi2, linux-image-4.15.0-1040-aws, linux-image-4.15.0-51-generic, linux-image-lowlatency-hwe-16.04, linux-image-generic-lpae-hwe-16.04, linux-image-4.15.0-51-generic-lpae, linux-image-4.15.0-1054-snapdragon, linux-image-lowlatency-hwe-16.04-edge, linux-image-oem, linux-raspi2, linux-oracle, linux-image-4.15.0-1039-oem, linux-image-4.15.0-1014-oracle, linux-image-generic, linux-image-virtual-hwe-16.04-edge, linux-image-lowlatency, linux-oem, linux-image-gcp, linux-image-generic-hwe-16.04, linux-image-generic-hwe-16.04-edge, linux-image-4.15.0-1035-kvm, linux-image-4.15.0-1037-raspi2, linux-image-generic-lpae-hwe-16.04-edge, linux-image-4.15.0-51-lowlatency, linux-image-generic-lpae, linux-gcp, linux-aws, linux-image-oracle, linux, linux-image-virtual-hwe-16.04, linux-snapdragon, linux-image-virtual, linux-image-kvm
• USN-4006-2: linux-image-snapdragon-hwe-18.04, linux-image-generic-lpae-hwe-18.04, linux-image-4.18.0-21-generic, linux-image-virtual-hwe-18.04, linux-image-4.18.0-21-lowlatency, linux-image-4.18.0-21-generic-lpae, linux-image-4.18.0-21-snapdragon, linux-hwe, linux-image-generic-hwe-18.04, linux-image-lowlatency-hwe-18.04
• USN-4007-2: linux-image-4.15.0-51-lowlatency, linux-hwe, linux-oracle, linux-image-4.15.0-1040-aws, linux-image-4.15.0-1014-oracle, linux-image-4.15.0-51-generic, linux-image-generic-hwe-16.04, linux-image-lowlatency-hwe-16.04, linux-image-oracle, linux-image-aws-hwe, linux-image-generic-lpae-hwe-16.04, linux-image-4.15.0-51-generic-lpae, linux-image-virtual-hwe-16.04, linux-aws-hwe, linux-image-oem
• USN-4008-3: linux-image-aws, linux-image-4.4.0-150-generic-lpae, linux-image-powerpc64-smp-lts-xenial, linux-image-generic-lpae-lts-xenial, linux-image-4.4.0-150-generic, linux-image-4.4.0-1045-aws, linux-image-4.4.0-150-powerpc-e500mc, linux-image-4.4.0-150-lowlatency, linux-image-lowlatency-lts-xenial, linux-image-virtual-lts-xenial, linux-image-4.4.0-150-powerpc-smp, linux-image-powerpc-smp-lts-xenial, linux-image-4.4.0-150-powerpc64-emb, linux-lts-xenial, linux-image-powerpc-e500mc-lts-xenial, linux-image-generic-lts-xenial, linux-image-4.4.0-150-powerpc64-smp, linux-aws, linux-image-powerpc64-emb-lts-xenial