A Linux kernel security update has been released for Ubuntu Linux 16.04 LTS.
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Ubuntu Security Notice USN-4303-1
March 17, 2020
linux, linux-aws, linux-kvm vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 16.04 LTS
Summary:
The system could be made to expose sensitive information.
Software Description:
- linux: Linux kernel
- linux-aws: Linux kernel for Amazon Web Services (AWS) systems
- linux-kvm: Linux kernel for cloud environments
Details:
Paulo Bonzini discovered that the KVM hypervisor implementation in the
Linux kernel could improperly let a nested (level 2) guest access the
resources of a parent (level 1) guest in certain situations. An 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 16.04 LTS:
linux-image-4.4.0-1068-kvm 4.4.0-1068.75
linux-image-4.4.0-1104-aws 4.4.0-1104.115
linux-image-4.4.0-176-generic 4.4.0-176.206
linux-image-4.4.0-176-generic-lpae 4.4.0-176.206
linux-image-4.4.0-176-lowlatency 4.4.0-176.206
linux-image-4.4.0-176-powerpc-e500mc 4.4.0-176.206
linux-image-4.4.0-176-powerpc-smp 4.4.0-176.206
linux-image-4.4.0-176-powerpc64-emb 4.4.0-176.206
linux-image-4.4.0-176-powerpc64-smp 4.4.0-176.206
linux-image-aws 4.4.0.1104.108
linux-image-generic 4.4.0.176.184
linux-image-generic-lpae 4.4.0.176.184
linux-image-kvm 4.4.0.1068.68
linux-image-lowlatency 4.4.0.176.184
linux-image-powerpc-e500mc 4.4.0.176.184
linux-image-powerpc-smp 4.4.0.176.184
linux-image-powerpc64-emb 4.4.0.176.184
linux-image-powerpc64-smp 4.4.0.176.184
linux-image-virtual 4.4.0.176.184
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/4303-1
CVE-2020-2732
Package Information:
https://launchpad.net/ubuntu/+source/linux/4.4.0-176.206
https://launchpad.net/ubuntu/+source/linux-aws/4.4.0-1104.115
https://launchpad.net/ubuntu/+source/linux-kvm/4.4.0-1068.75
