Ubuntu Security Notice USN-3521-1
9th 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.
– NVIDIA binary X.Org driver
Jann Horn 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.
This update provides mitigations to address the issue, along with
compatibility fixes 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.