Ubuntu Security Notice USN-3531-1
11th January, 2018
A security issue affects these releases of Ubuntu and its
- Ubuntu 17.10
- Ubuntu 17.04
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS
The system could be made to expose sensitive information.
– Processor microcode for Intel CPUs
It was discovered that microprocessors utilizing speculative execution
and branch prediction may allow unauthorized memory reads via sidechannel
attacks. This flaw is known as Spectre. A local attacker could use this to
expose sensitive information, including kernel memory. (CVE-2017-5715)
This update provides the microcode updates required for the corresponding
Linux kernel updates.
The problem can be corrected by updating your system to the following
- Ubuntu 17.10:
- Ubuntu 17.04:
- Ubuntu 16.04 LTS:
- Ubuntu 14.04 LTS:
To update your system, please follow these instructions:
After a standard system update you need to reboot your computer to make
all the necessary changes.