Advisory Published

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

First published: Tue Aug 13 2019(Updated: )

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).

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/linux-image-5.0.0-1012-aws<5.0.0-1012.13
5.0.0-1012.13
Ubuntu OpenSSH Client=19.04
All of
ubuntu/linux-image-aws<5.0.0.1012.12
5.0.0.1012.12
Ubuntu OpenSSH Client=19.04
All of
ubuntu/linux-image-4.15.0-1045-aws<4.15.0-1045.47
4.15.0-1045.47
Ubuntu OpenSSH Client=18.04
All of
ubuntu/linux-image-aws<4.15.0.1045.44
4.15.0.1045.44
Ubuntu OpenSSH Client=18.04
All of
ubuntu/linux-image-4.15.0-1045-aws<4.15.0-1045.47~16.04.1
4.15.0-1045.47~16.04.1
Ubuntu OpenSSH Client=16.04
All of
ubuntu/linux-image-aws-hwe<4.15.0.1045.45
4.15.0.1045.45
Ubuntu OpenSSH Client=16.04

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Reference Links

Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the vulnerability ID for this Linux kernel (AWS) vulnerability?

    The vulnerability ID for this Linux kernel (AWS) vulnerability is USN-4096-1.

  • How does the vulnerability affect the Linux kernel?

    The vulnerability affects some x86 processors and can be used by a local attacker to expose sensitive information in the kernel memory.

  • Which software versions are affected by this vulnerability?

    The following software versions are affected: - Ubuntu Ubuntu 19.04 with linux-image-5.0.0-1012-aws (up to version 5.0.0-1012.13) - Ubuntu Ubuntu 19.04 with linux-image-aws (up to version 5.0.0.1012.12) - Ubuntu Ubuntu 18.04 with linux-image-4.15.0-1045-aws (up to version 4.15.0-1045.47) - Ubuntu Ubuntu 18.04 with linux-image-aws (up to version 4.15.0.1045.44) - Ubuntu Ubuntu 16.04 with linux-image-4.15.0-1045-aws (up to version 4.15.0-1045.47~16.04.1) - Ubuntu Ubuntu 16.04 with linux-image-aws-hwe (up to version 4.15.0.1045.45)

  • How can I fix this vulnerability?

    To fix the vulnerability, you should update your Linux kernel to the recommended versions: - For Ubuntu 19.04, update to linux-image-5.0.0-1012-aws version 5.0.0-1012.13. - For Ubuntu 18.04, update to linux-image-4.15.0-1045-aws version 4.15.0-1045.47. - For Ubuntu 16.04, update to linux-image-4.15.0-1045-aws version 4.15.0-1045.47~16.04.1 or linux-image-aws-hwe version 4.15.0.1045.45.

  • Where can I find more information about this vulnerability?

    You can find more information about this vulnerability on the following references: - [CVE-2019-1125](https://ubuntu.com/security/CVE-2019-1125) - [USN-4095-1](https://ubuntu.com/security/notices/USN-4095-1) - [USN-4094-1](https://ubuntu.com/security/notices/USN-4094-1)

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