Ubuntu 14.04 LTS : amd64-microcode regression (USN-3690-2) (Spectre)
Medium Nessus Plugin ID 110939
SynopsisThe remote Ubuntu host is missing a security-related patch.
DescriptionUSN-3690-1 provided updated microcode for AMD processors to address CVE-2017-5715 (aka Spectre). Unfortunately, the update caused some systems to fail to boot. This update reverts the update for Ubuntu 14.04 LTS.
We apologize for the inconvenience.
Original advisory details :
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 the microcode updates for AMD 17H family processors 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 amd64-microcode package.