{"schemaVersion":3,"id":"USN-3690-2","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"amd64-microcode regression\n\nUSN-3690-1 provided updated microcode for AMD processors to address\nCVE-2017-5715 (aka Spectre). Unfortunately, the update caused some\nsystems to fail to boot. This update reverts the update for Ubuntu\n14.04 LTS.\n\nWe apologize for the inconvenience.\n\nOriginal advisory details:\n\n Jann Horn discovered that microprocessors utilizing speculative execution\n and branch prediction may allow unauthorized memory reads via sidechannel\n attacks. This flaw is known as Spectre. A local attacker could use this to\n expose sensitive information, including kernel memory.\n\n This update provides the microcode updates for AMD 17H family\n processors required for the corresponding Linux kernel updates.","dates":{"published":"2018-07-05T22:13:21.000Z","modified":"2026-02-10T04:41:22.000Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":null,"severity":"unknown","version":null,"versionLabel":null,"source":null,"vector":null,"computed":false,"selection":"none"},"metrics":[]},"epss":{"probability":null,"percentile":null,"severity":"unknown","asOf":null,"change":{"pp":null,"baselineDate":null,"baselineScore":null},"history":[],"last30":[]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[],"affected":[{"vendor":"ubuntu","product":"amd64-microcode","name":"amd64-microcode","label":"amd64-microcode","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/amd64-microcode","purlType":"deb","versions":[{"text":"< 3.20180524.1~ubuntu0.14.04.2+really20130710.1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 3.20180524.1~ubuntu0.14.04.2+really20130710.1","eol":null,"hubHref":null}],"affectedCount":1,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://ubuntu.com/security/notices/USN-3690-2","label":"ubuntu.com/security/notices/USN-3690-2","hostname":"ubuntu.com","tags":["Advisory"]},{"url":"https://launchpad.net/bugs/1779092","label":"launchpad.net/bugs/1779092","hostname":"launchpad.net","tags":["REPORT"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2018-07-05T22:13:21.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-02-10T04:41:22.000Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":0,"level":"minimal","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-20T16:51:19.394Z","stale":false,"partial":false}}