Executive Summary

Title Intel Microcode regression
Name USN-4182-4 First vendor Publication 2019-12-04
Vendor Ubuntu Last vendor Modification 2019-12-04
Severity (Vendor) N/A Revision N/A

Security-Database Scoring CVSS v3

Cvss vector : N/A
Overall CVSS Score NA
Base Score NA Environmental Score NA
impact SubScore NA Temporal Score NA
Exploitabality Sub Score NA
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Security-Database Scoring CVSS v2

Cvss vector :
Cvss Base Score N/A Attack Range N/A
Cvss Impact Score N/A Attack Complexity N/A
Cvss Expoit Score N/A Authentication N/A
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 14.04 ESM


USN-4182-2 introduced a regression in the Intel Microcode for some Skylake processors.

Software Description: - intel-microcode: Processor microcode for Intel CPUs


USN-4182-2 provided updated Intel Processor Microcode. A regression was discovered that caused some Skylake processors to hang after a warm reboot. This update reverts the microcode for that specific processor family.

We apologize for the inconvenience.

Original advisory details:

Stephan van Schaik, Alyssa Milburn, Sebastian Ă–sterlund, 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 certain Intel Xeon processors did not properly
restrict access to a voltage modulation interface. A local privileged
attacker could use this to cause a denial of service (system crash).

Update instructions:

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

Ubuntu 14.04 ESM:
intel-microcode 3.20191115.1ubuntu0.14.04.2

After a standard system update you need to reboot your computer.


Original Source

Url : http://www.ubuntu.com/usn/USN-4182-4

Alert History

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Date Informations
2019-12-04 09:19:46
  • First insertion