==========================================================================
Kernel Live Patch Security Notice 0051-1
May 14, 2019

linux vulnerability
==========================================================================

A security issue affects these releases of Ubuntu:

| Series           | Base kernel  | Arch     | flavors          |
|------------------+--------------+----------+------------------|
| Ubuntu 18.04 LTS | 4.15.0       | amd64    | generic          |
| Ubuntu 18.04 LTS | 4.15.0       | amd64    | lowlatency       |
| Ubuntu 16.04 LTS | 4.4.0        | amd64    | generic          |
| Ubuntu 16.04 LTS | 4.4.0        | amd64    | lowlatency       |
| Ubuntu 14.04 LTS | 4.4.0        | amd64    | generic          |
| Ubuntu 14.04 LTS | 4.4.0        | amd64    | lowlatency       |

Summary:

On May 14, fixes for CVE-2018-12126, CVE-2018-12127, CVE-2018-12130,
and CVE-2019-11091 were released into the Ubuntu Xenial and Bionic
kernels. These CVEs are security vulnerabilities caused by flaws in the
design of speculative execution hardware in the computer's CPU.
Researchers discovered that memory contents previously stored in
microarchitectural buffers of an Intel CPU core may be visible to other
processes running on the same core.

Details on the vulnerability and our response can be found here:
https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/MDS

Due to the high complexity of the fixes and the need for a corresponding
CPU microcode update for a complete fix, we are unable to livepatch these
CVEs. Please plan to reboot into an updated kernel as soon as possible.

Software Description:
- linux: Linux kernel

Update instructions:

Users running Ubuntu 18.04 LTS should upgrade to kernel version 4.15.0-50.54
or later.

Users running Ubuntu 16.04 LTS or 14.04 LTS should upgrade to kernel version 
4.4.0-148.174 or later.

References:
  CVE-2018-12126, CVE-2018-12127, CVE-2018-12130, and CVE-2019-11091



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