Ubuntu 14.04 LTS / 16.04 LTS / 17.10 : intel-microcode regression (USN-3531-2) (Spectre)
Medium Nessus Plugin ID 106264
SynopsisThe remote Ubuntu host is missing a security-related patch.
DescriptionUSN-3531-1 updated Intel microcode to the 20180108 release.
Regressions were discovered in the microcode updates which could cause system instability on certain hardware platforms. At the request of Intel, we have reverted to the previous packaged microcode version, the 20170707 release.
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.
Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
SolutionUpdate the affected intel-microcode package.