USN-4006-1: Linux kernel vulnerability
linux, linux-aws, linux-gcp, linux-kvm, linux-raspi2 vulnerability
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 18.10
Summary
A system hardening measure could be bypassed.
Software Description
- 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-4.18.0-1012-gcp – 4.18.0-1012.13
- linux-image-4.18.0-1013-kvm – 4.18.0-1013.13
- linux-image-4.18.0-1015-raspi2 – 4.18.0-1015.17
- linux-image-4.18.0-1017-aws – 4.18.0-1017.19
- linux-image-4.18.0-21-generic – 4.18.0-21.22
- linux-image-4.18.0-21-generic-lpae – 4.18.0-21.22
- 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-aws – 4.18.0.1017.17
- linux-image-gcp – 4.18.0.1012.12
- linux-image-generic – 4.18.0.21.22
- linux-image-generic-lpae – 4.18.0.21.22
- linux-image-gke – 4.18.0.1012.12
- linux-image-kvm – 4.18.0.1013.13
- linux-image-lowlatency – 4.18.0.21.22
- linux-image-raspi2 – 4.18.0.1015.12
- linux-image-snapdragon – 4.18.0.21.22
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.
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