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

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

linux-aws, linux-aws-hwe vulnerability

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

Summary

The system could be made to expose sensitive information.

Software Description

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-aws5.0.0-1012.13
linux-image-aws5.0.0.1012.12
Ubuntu 18.04 LTS
linux-image-4.15.0-1045-aws4.15.0-1045.47
linux-image-aws4.15.0.1045.44
Ubuntu 16.04 LTS
linux-image-4.15.0-1045-aws4.15.0-1045.47~16.04.1
linux-image-aws-hwe4.15.0.1045.45

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.

References

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

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