USN-4253-1: Linux kernel vulnerability

  • Thread starter Ubuntu security notices
  • Start date
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Ubuntu security notices

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linux, linux-aws vulnerability


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

  • Ubuntu 19.10
Summary


The Linux kernel could be made to expose sensitive information.

Software Description

  • linux - Linux kernel
  • linux-aws - Linux kernel for Amazon Web Services (AWS) systems
Details


It was discovered that the Linux kernel did not properly clear data structures on context switches for certain Intel graphics processors. A local attacker could use this to expose sensitive information.

Update instructions


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

Ubuntu 19.10
linux-image-5.3.0-1010-aws - 5.3.0-1010.11
linux-image-5.3.0-29-generic - 5.3.0-29.31
linux-image-5.3.0-29-generic-lpae - 5.3.0-29.31
linux-image-5.3.0-29-lowlatency - 5.3.0-29.31
linux-image-5.3.0-29-snapdragon - 5.3.0-29.31
linux-image-aws - 5.3.0.1010.12
linux-image-generic - 5.3.0.29.33
linux-image-generic-lpae - 5.3.0.29.33
linux-image-lowlatency - 5.3.0.29.33
linux-image-virtual - 5.3.0.29.33

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


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