[USN-4182-2] Intel Microcode update
steve.beattie at canonical.com
Tue Nov 12 22:10:34 UTC 2019
Ubuntu Security Notice USN-4182-2
November 12, 2019
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 14.04 ESM
Several security issues were fixed in Intel Microcode.
- intel-microcode: Processor microcode for Intel CPUs
USN-4182-2 provided updates for Intel Microcode. This update provides
the corresponding update for Ubuntu 14.04 ESM.
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 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).
The problem can be corrected by updating your system to the following
Ubuntu 14.04 ESM:
After a standard system update you need to reboot your computer.
Please note that in order to fully mitigate CVE-2019-11139, a warm
reboot is required *after* applying the microcode update; so in effect
a second reboot.
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