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Ubuntu 16.04 LTS USN-4186-1: Critical Kernel Security Issues

ubuntu
Calendar Grey November 12, 2019
Dist Ubuntu Esm H88
Ubuntu Security Notice USN-4187-1 presents solutions for kernel flaws impacting a range of platforms.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux: Linux kernel

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

- linux-kvm: Linux kernel for cloud environments

Details:

Stephan van Schaik, Alyssa Milburn, Sebastian Österlund, Pietro Frigo,

Kaveh Razavi, Herbert Bos, Cristiano Giuffrida, Giorgi Maisuradze, Moritz

Lipp, Michael Schwarz, Daniel Gruss, and Jo Van Bulck discovered that Intel

processors using Transactional Synchronization Extensions (TSX) could

expose memory contents previously stored in microarchitectural buffers to a

malicious process that is executing on the same CPU core. A local attacker

could use this to expose sensitive information. (CVE-2019-11135)

It was discovered that the Intel i915 graphics chipsets allowed userspace

to modify page table entries via writes to MMIO from the Blitter Command

Streamer and expose kernel memory information. A local attacker could use

this to expose sensi...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service Ubuntu kernel information exposure

Update Instructions

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

Ubuntu 16.04 LTS:
  linux-image-4.4.0-1062-kvm      4.4.0-1062.69
  linux-image-4.4.0-1098-aws      4.4.0-1098.109
  linux-image-4.4.0-168-generic   4.4.0-168.197
  linux-image-4.4.0-168-generic-lpae  4.4.0-168.197
  linux-image-4.4.0-168-lowlatency  4.4.0-168.197
  linux-image-4.4.0-168-powerpc-e500mc  4.4.0-168.197
  linux-image-4.4.0-168-powerpc-smp  4.4.0-168.197
  linux-image-4.4.0-168-powerpc64-emb  4.4.0-168.197
  linux-image-4.4.0-168-powerpc64-smp  4.4.0-168.197
  linux-image-aws                 4.4.0.1098.102
  linux-image-generic             4.4.0.168.176
  linux-image-generic-lpae        4.4.0.168.176
  linux-image-kvm                 4.4.0.1062.62
  linux-image-lowlatency          4.4.0.168.176
  linux-image-powerpc-e500mc      4.4.0.168.176
  linux-image-powerpc-smp         4.4.0.168.176
  linux-image-powerpc64-emb       4.4.0.168.176
  linux-image-powerpc64-smp       4.4.0.168.176
  linux-image-virtual             4.4.0.168.176

Please note that mitigating the TSX (CVE-2019-11135) and i915
(CVE-2019-0154) issues requires corresponding microcode and graphics
firmware updates respectively.

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-4186-1

CVE-2018-12207, CVE-2019-0154, CVE-2019-0155, CVE-2019-11135,

CVE-2019-15098, CVE-2019-16746, CVE-2019-17052, CVE-2019-17053,

CVE-2019-17054, CVE-2019-17055, CVE-2019-17056, CVE-2019-17666,

CVE-2019-2215,

https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/TAA_MCEPSC_i915

Severity
critical
Lowest
Low
Medium
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Critical

November 13, 2019

Topics%20covered

Topics Covered

security advisory denial of service Ubuntu kernel information exposure

Package Information

https://launchpad.net/ubuntu/+source/linux/4.4.0-168.197
https://launchpad.net/ubuntu/+source/linux-aws/4.4.0-1098.109
https://launchpad.net/ubuntu/+source/linux-kvm/4.4.0-1062.69

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