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Ubuntu 19.10 USN-4183-2: Critical Kernel Issues and Fixes

ubuntu
Calendar Grey November 13, 2019
Dist Ubuntu Esm H88
November 2020 releases tackle significant system vulnerabilities impacting Fedora users as a result of various security breaches and threats.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux: Linux kernel

Details:

USN-4183-1 fixed vulnerabilities in the Linux kernel. It was

discovered that the kernel fix for CVE-2019-0155 (i915 missing Blitter

Command Streamer check) was incomplete on 64-bit Intel x86 systems.

This update addresses the issue.

We apologize for the inconvenience.

Original advisory 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 graph...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory buffer overflow DoS Ubuntu kernel system crash memory exposure

Update Instructions

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

Ubuntu 19.10:
  linux-image-5.3.0-23-generic    5.3.0-23.25
  linux-image-5.3.0-23-generic-lpae  5.3.0-23.25
  linux-image-5.3.0-23-lowlatency  5.3.0-23.25
  linux-image-5.3.0-23-snapdragon  5.3.0-23.25
  linux-image-generic             5.3.0.23.27
  linux-image-generic-lpae        5.3.0.23.27
  linux-image-lowlatency          5.3.0.23.27
  linux-image-snapdragon          5.3.0.23.27
  linux-image-virtual             5.3.0.23.27

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-4183-2

https://ubuntu.com/security/notices/USN-4183-1

CVE-2019-0155, https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1852141

Severity
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November 13, 2019

Topics%20covered

Topics Covered

security advisory buffer overflow DoS Ubuntu kernel system crash memory exposure

Package Information

https://launchpad.net/ubuntu/+source/linux/5.3.0-23.25

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