Ubuntu 18.04 LTS: 0071-1 Critical: Linux Kernel Denial Of Service

The problem can be corrected by updating your kernel livepatch to the
following versions:

Ubuntu 18.04 LTS
    aws - 71.1
    generic - 71.1
    lowlatency - 71.1
    oem - 71.1

A mitigation is available if your kernel is affected, did not yet
receive a livepatch, and rebooting into the most recently released
kernel is not practical. If your system does not require the use of
unprivileged user namespaces, you may disable them and mitigate the
problem using the following command:

    sudo sysctl kernel.unprivileged_userns_clone=0


Support Information

Kernels older than the levels listed below do not receive livepatch
updates. If you are running a kernel version earlier than the one listed
below, please upgrade your kernel as soon as possible.

Ubuntu 18.04 LTS
    linux-aws - 4.15.0-1054
    linux-oem - 4.15.0-1063
    linux - 4.15.0-69

Ubuntu 16.04 LTS
    linux-azure - 4.15.0-1063


References

-   CVE-2020-14386


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