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Ubuntu 14.04 LTS USN-3741-2 Critical: Kernel L1 Terminal Fault Fix

ubuntu
Calendar Grey August 14, 2018
Dist Ubuntu Esm H88
Security issues in Ubuntu 14.04 LTS fixed with kernel updates. Critical information on mitigation provided.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

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

- linux-lts-xenial: Linux hardware enablement kernel from Xenial for Trusty

Details:

USN-3741-1 fixed vulnerabilities in the Linux kernel for Ubuntu 16.04

LTS. This update provides the corresponding updates for the Linux

Hardware Enablement (HWE) kernel from Ubuntu 16.04 LTS for Ubuntu

14.04 LTS.

It was discovered that memory present in the L1 data cache of an Intel CPU

core may be exposed to a malicious process that is executing on the CPU

core. This vulnerability is also known as L1 Terminal Fault (L1TF). A local

attacker in a guest virtual machine could use this to expose sensitive

information (memory from other guests or the host OS). (CVE-2018-3646)

It was discovered that memory present in the L1 data cache of an Intel CPU

core may be exposed to a malicious process that is executing on the CPU

core. This vulnerability is also known ...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service update Ubuntu kernel AWS L1 Terminal Fault

Update Instructions

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

Ubuntu 14.04 LTS:
  linux-image-4.4.0-1027-aws      4.4.0-1027.30
  linux-image-4.4.0-133-generic   4.4.0-133.159~14.04.1
  linux-image-4.4.0-133-generic-lpae  4.4.0-133.159~14.04.1
  linux-image-4.4.0-133-lowlatency  4.4.0-133.159~14.04.1
  linux-image-4.4.0-133-powerpc-e500mc  4.4.0-133.159~14.04.1
  linux-image-4.4.0-133-powerpc-smp  4.4.0-133.159~14.04.1
  linux-image-4.4.0-133-powerpc64-emb  4.4.0-133.159~14.04.1
  linux-image-4.4.0-133-powerpc64-smp  4.4.0-133.159~14.04.1
  linux-image-aws                 4.4.0.1027.27
  linux-image-generic-lpae-lts-xenial  4.4.0.133.113
  linux-image-generic-lts-xenial  4.4.0.133.113
  linux-image-lowlatency-lts-xenial  4.4.0.133.113
  linux-image-powerpc-e500mc-lts-xenial  4.4.0.133.113
  linux-image-powerpc-smp-lts-xenial  4.4.0.133.113
  linux-image-powerpc64-emb-lts-xenial  4.4.0.133.113
  linux-image-powerpc64-smp-lts-xenial  4.4.0.133.113

Please note that the recommended mitigation for CVE-2018-3646 involves
updating processor microcode in addition to updating the kernel;
however, the kernel includes a fallback for processors that have not
received microcode updates.

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://ubuntu.com/security/notices/USN-3741-2

https://ubuntu.com/security/notices/USN-3741-1

CVE-2018-3620, CVE-2018-3646, CVE-2018-5390, CVE-2018-5391,

https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/L1TF

August 14, 2018

Topics%20covered

Topics Covered

security advisory denial of service update Ubuntu kernel AWS L1 Terminal Fault

Package Information

https://launchpad.net/ubuntu/+source/linux-aws/4.4.0-1027.30
https://launchpad.net/ubuntu/+source/linux-lts-xenial/4.4.0-133.159~14.04.1

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