{"id":"UBUNTU-CVE-2016-3158","details":"The xrstor function in arch/x86/xstate.c in Xen 4.x does not properly handle writes to the hardware FSW.ES bit when running on AMD64 processors, which allows local guest OS users to obtain sensitive register content information from another guest by leveraging pending exception and mask bits.  NOTE: this vulnerability exists because of an incorrect fix for CVE-2013-2076.","modified":"2025-09-08T16:43:41Z","published":"2016-04-13T16:59:00Z","upstream":["CVE-2016-3158"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2016-3158"},{"type":"REPORT","url":"http://xenbits.xen.org/xsa/advisory-172.html"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2016-3158"}],"affected":[{"package":{"name":"xen","ecosystem":"Ubuntu:14.04:LTS","purl":"pkg:deb/ubuntu/xen@4.4.2-0ubuntu0.14.04.6?arch=source&distro=trusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.4.2-0ubuntu0.14.04.6"}]}],"versions":["4.3.0-1ubuntu1","4.3.0-1ubuntu2","4.3.0-1ubuntu3","4.3.0-1ubuntu4","4.3.0-1ubuntu5","4.4.0-0ubuntu3","4.4.0-0ubuntu4","4.4.0-0ubuntu5","4.4.0-0ubuntu5.1","4.4.0-0ubuntu5.2","4.4.1-0ubuntu0.14.04.1","4.4.1-0ubuntu0.14.04.2","4.4.1-0ubuntu0.14.04.3","4.4.1-0ubuntu0.14.04.4","4.4.1-0ubuntu0.14.04.5","4.4.1-0ubuntu0.14.04.6","4.4.2-0ubuntu0.14.04.1","4.4.2-0ubuntu0.14.04.2","4.4.2-0ubuntu0.14.04.3","4.4.2-0ubuntu0.14.04.4","4.4.2-0ubuntu0.14.04.5"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_version":"4.4.2-0ubuntu0.14.04.6","binary_name":"libxen-4.4"},{"binary_version":"4.4.2-0ubuntu0.14.04.6","binary_name":"libxen-dev"},{"binary_version":"4.4.2-0ubuntu0.14.04.6","binary_name":"libxen-ocaml"},{"binary_version":"4.4.2-0ubuntu0.14.04.6","binary_name":"libxen-ocaml-dev"},{"binary_version":"4.4.2-0ubuntu0.14.04.6","binary_name":"libxenstore3.0"},{"binary_version":"4.4.2-0ubuntu0.14.04.6","binary_name":"xen-hypervisor-4.1-amd64"},{"binary_version":"4.4.2-0ubuntu0.14.04.6","binary_name":"xen-hypervisor-4.3-amd64"},{"binary_version":"4.4.2-0ubuntu0.14.04.6","binary_name":"xen-hypervisor-4.3-armhf"},{"binary_version":"4.4.2-0ubuntu0.14.04.6","binary_name":"xen-hypervisor-4.4-amd64"},{"binary_version":"4.4.2-0ubuntu0.14.04.6","binary_name":"xen-hypervisor-4.4-arm64"},{"binary_version":"4.4.2-0ubuntu0.14.04.6","binary_name":"xen-hypervisor-4.4-armhf"},{"binary_version":"4.4.2-0ubuntu0.14.04.6","binary_name":"xen-system-amd64"},{"binary_version":"4.4.2-0ubuntu0.14.04.6","binary_name":"xen-system-arm64"},{"binary_version":"4.4.2-0ubuntu0.14.04.6","binary_name":"xen-system-armhf"},{"binary_version":"4.4.2-0ubuntu0.14.04.6","binary_name":"xen-utils-4.4"},{"binary_version":"4.4.2-0ubuntu0.14.04.6","binary_name":"xen-utils-common"},{"binary_version":"4.4.2-0ubuntu0.14.04.6","binary_name":"xenstore-utils"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2016/UBUNTU-CVE-2016-3158.json"}},{"package":{"name":"xen","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/xen@4.6.0-1ubuntu4.1?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.6.0-1ubuntu4.1"}]}],"versions":["4.5.1-0ubuntu1","4.5.1-0ubuntu2","4.6.0-1ubuntu1","4.6.0-1ubuntu2","4.6.0-1ubuntu4"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_version":"4.6.0-1ubuntu4.1","binary_name":"libxen-4.6"},{"binary_version":"4.6.0-1ubuntu4.1","binary_name":"libxen-dev"},{"binary_version":"4.6.0-1ubuntu4.1","binary_name":"libxenstore3.0"},{"binary_version":"4.6.0-1ubuntu4.1","binary_name":"xen-hypervisor-4.4-amd64"},{"binary_version":"4.6.0-1ubuntu4.1","binary_name":"xen-hypervisor-4.4-arm64"},{"binary_version":"4.6.0-1ubuntu4.1","binary_name":"xen-hypervisor-4.4-armhf"},{"binary_version":"4.6.0-1ubuntu4.1","binary_name":"xen-hypervisor-4.5-amd64"},{"binary_version":"4.6.0-1ubuntu4.1","binary_name":"xen-hypervisor-4.5-arm64"},{"binary_version":"4.6.0-1ubuntu4.1","binary_name":"xen-hypervisor-4.5-armhf"},{"binary_version":"4.6.0-1ubuntu4.1","binary_name":"xen-hypervisor-4.6-amd64"},{"binary_version":"4.6.0-1ubuntu4.1","binary_name":"xen-hypervisor-4.6-arm64"},{"binary_version":"4.6.0-1ubuntu4.1","binary_name":"xen-hypervisor-4.6-armhf"},{"binary_version":"4.6.0-1ubuntu4.1","binary_name":"xen-system-amd64"},{"binary_version":"4.6.0-1ubuntu4.1","binary_name":"xen-system-arm64"},{"binary_version":"4.6.0-1ubuntu4.1","binary_name":"xen-system-armhf"},{"binary_version":"4.6.0-1ubuntu4.1","binary_name":"xen-utils-4.6"},{"binary_version":"4.6.0-1ubuntu4.1","binary_name":"xen-utils-common"},{"binary_version":"4.6.0-1ubuntu4.1","binary_name":"xenstore-utils"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2016/UBUNTU-CVE-2016-3158.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N"},{"type":"Ubuntu","score":"medium"}]}