{"id":"USN-3756-1","summary":"intel-microcode vulnerabilities","details":"It was discovered that memory present in the L1 data cache of an Intel CPU\ncore may be exposed to a malicious process that is executing on the CPU\ncore. This vulnerability is also known as L1 Terminal Fault (L1TF). A local\nattacker in a guest virtual machine could use this to expose sensitive\ninformation (memory from other guests or the host OS). (CVE-2018-3646)\n\nJann Horn and Ken Johnson discovered that microprocessors utilizing\nspeculative execution of a memory read may allow unauthorized memory reads\nvia a sidechannel attack. This flaw is known as Spectre Variant 4. A local\nattacker could use this to expose sensitive information, including kernel\nmemory. (CVE-2018-3639)\n\nZdenek Sojka, Rudolf Marek, Alex Zuepke, and Innokentiy Sennovskiy\ndiscovered that microprocessors that perform speculative reads of\nsystem registers may allow unauthorized disclosure of system parameters\nvia a sidechannel attack. This vulnerability is also known as Rogue\nSystem Register Read (RSRE). An attacker could use this to expose\nsensitive information. (CVE-2018-3640)\n","modified":"2026-02-10T04:41:25Z","published":"2018-08-27T18:48:59Z","related":["UBUNTU-CVE-2018-3639","UBUNTU-CVE-2018-3640","UBUNTU-CVE-2018-3646"],"upstream":["CVE-2018-3639","CVE-2018-3640","CVE-2018-3646","UBUNTU-CVE-2018-3639","UBUNTU-CVE-2018-3640","UBUNTU-CVE-2018-3646"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-3756-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2018-3639"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2018-3640"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2018-3646"}],"affected":[{"package":{"name":"intel-microcode","ecosystem":"Ubuntu:14.04:LTS","purl":"pkg:deb/ubuntu/intel-microcode@3.20180807a.0ubuntu0.14.04.1?arch=source&distro=trusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.20180807a.0ubuntu0.14.04.1"}]}],"versions":["1.20130906.1ubuntu2","1.20130906.1ubuntu3","2.20140122.1","2.20140430.1ubuntu1","2.20140624-t-1ubuntu2","3.20180108.0~ubuntu14.04.2","3.20180108.0+really20170707ubuntu14.04.1","3.20180312.0~ubuntu14.04.1","3.20180425.1~ubuntu0.14.04.1","3.20180425.1~ubuntu0.14.04.2"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"intel-microcode","binary_version":"3.20180807a.0ubuntu0.14.04.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-3756-1.json","cves_map":{"ecosystem":"Ubuntu:14.04:LTS","cves":[{"severity":[{"score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2018-3639"},{"severity":[{"score":"CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2018-3640"},{"severity":[{"score":"CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N","type":"CVSS_V3"},{"score":"high","type":"Ubuntu"}],"id":"CVE-2018-3646"}]}}},{"package":{"name":"intel-microcode","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/intel-microcode@3.20180807a.0ubuntu0.16.04.1?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.20180807a.0ubuntu0.16.04.1"}]}],"versions":["3.20150121.1","3.20151106.1","3.20170707.1~ubuntu16.04.0","3.20180108.0~ubuntu16.04.2","3.20180108.0+really20170707ubuntu16.04.1","3.20180312.0~ubuntu16.04.1","3.20180425.1~ubuntu0.16.04.1","3.20180425.1~ubuntu0.16.04.2"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"intel-microcode","binary_version":"3.20180807a.0ubuntu0.16.04.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-3756-1.json","cves_map":{"ecosystem":"Ubuntu:16.04:LTS","cves":[{"severity":[{"score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2018-3639"},{"severity":[{"score":"CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2018-3640"},{"severity":[{"score":"CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N","type":"CVSS_V3"},{"score":"high","type":"Ubuntu"}],"id":"CVE-2018-3646"}]}}},{"package":{"name":"intel-microcode","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/intel-microcode@3.20180807a.0ubuntu0.18.04.1?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.20180807a.0ubuntu0.18.04.1"}]}],"versions":["3.20170707.1","3.20171117.1","3.20180108.1","3.20180108.1+really20171117.1","3.20180312.0~ubuntu18.04.1","3.20180425.1~ubuntu0.18.04.1","3.20180425.1~ubuntu0.18.04.2"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"intel-microcode","binary_version":"3.20180807a.0ubuntu0.18.04.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-3756-1.json","cves_map":{"ecosystem":"Ubuntu:18.04:LTS","cves":[{"severity":[{"score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2018-3639"},{"severity":[{"score":"CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2018-3640"},{"severity":[{"score":"CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N","type":"CVSS_V3"},{"score":"high","type":"Ubuntu"}],"id":"CVE-2018-3646"}]}}}],"schema_version":"1.7.3"}