N/A - USN-4096-1

Executive Summary

Summary
Title	Linux kernel (AWS) vulnerability

Informations
Name	USN-4096-1	First vendor Publication	2019-08-13
Vendor	Ubuntu	Last vendor Modification	2019-08-13
Severity (Vendor)	N/A	Revision	N/A

Security-Database Scoring CVSS v3

Cvss vector : N/A
Overall CVSS Score	NA
Base Score	NA	Environmental Score	NA
impact SubScore	NA	Temporal Score	NA
Exploitabality Sub Score	NA

Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector :
Cvss Base Score	N/A	Attack Range	N/A
Cvss Impact Score	N/A	Attack Complexity	N/A
Cvss Expoit Score	N/A	Authentication	N/A
Calculate full CVSS 2.0 Vectors scores

Detail

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

- Ubuntu 19.04 - Ubuntu 18.04 LTS - Ubuntu 16.04 LTS

Summary:

The system could be made to expose sensitive information.

Software Description: - 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:
linux-image-5.0.0-1012-aws 5.0.0-1012.13
linux-image-aws 5.0.0.1012.12

Ubuntu 18.04 LTS:
linux-image-4.15.0-1045-aws 4.15.0-1045.47
linux-image-aws 4.15.0.1045.44

Ubuntu 16.04 LTS:
linux-image-4.15.0-1045-aws 4.15.0-1045.47~16.04.1
linux-image-aws-hwe 4.15.0.1045.45

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:
https://usn.ubuntu.com/4096-1
CVE-2019-1125

Package Information:
https://launchpad.net/ubuntu/+source/linux-aws/5.0.0-1012.13
https://launchpad.net/ubuntu/+source/linux-aws/4.15.0-1045.47
https://launchpad.net/ubuntu/+source/linux-aws-hwe/4.15.0-1045.47~16.04.1