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. (CVE-2017-5715)
This update provides the corrected microcode updates required for the corresponding Linux kernel updates.
3.20180312.0~ubuntu14.04.13.20180312.0~ubuntu16.04.1