{"id":"UBUNTU-CVE-2023-46842","details":"Unlike 32-bit PV guests, HVM guests may switch freely between 64-bit and other modes.  This in particular means that they may set registers used to pass 32-bit-mode hypercall arguments to values outside of the range 32-bit code would be able to set them to. When processing of hypercalls takes a considerable amount of time, the hypervisor may choose to invoke a hypercall continuation.  Doing so involves putting (perhaps updated) hypercall arguments in respective registers.  For guests not running in 64-bit mode this further involves a certain amount of translation of the values. Unfortunately internal sanity checking of these translated values assumes high halves of registers to always be clear when invoking a hypercall.  When this is found not to be the case, it triggers a consistency check in the hypervisor and causes a crash.","modified":"2026-05-20T16:07:46.616678104Z","published":"2024-05-16T14:15:00Z","upstream":["CVE-2023-46842"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2023-46842"},{"type":"REPORT","url":"https://xenbits.xen.org/xsa/advisory-454.html"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2023-46842"}],"affected":[{"package":{"name":"xen","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/xen?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.5.1-0ubuntu1","4.5.1-0ubuntu2","4.6.0-1ubuntu1","4.6.0-1ubuntu2","4.6.0-1ubuntu4","4.6.0-1ubuntu4.1","4.6.0-1ubuntu4.2","4.6.0-1ubuntu4.3","4.6.5-0ubuntu1","4.6.5-0ubuntu1.1","4.6.5-0ubuntu1.2","4.6.5-0ubuntu1.4"],"ecosystem_specific":{"binaries":[{"binary_name":"libxen-4.6","binary_version":"4.6.5-0ubuntu1.4"},{"binary_version":"4.6.5-0ubuntu1.4","binary_name":"libxenstore3.0"},{"binary_version":"4.6.5-0ubuntu1.4","binary_name":"xen-hypervisor-4.4-amd64"},{"binary_name":"xen-hypervisor-4.4-arm64","binary_version":"4.6.5-0ubuntu1.4"},{"binary_version":"4.6.5-0ubuntu1.4","binary_name":"xen-hypervisor-4.4-armhf"},{"binary_name":"xen-hypervisor-4.5-amd64","binary_version":"4.6.5-0ubuntu1.4"},{"binary_version":"4.6.5-0ubuntu1.4","binary_name":"xen-hypervisor-4.5-arm64"},{"binary_name":"xen-hypervisor-4.5-armhf","binary_version":"4.6.5-0ubuntu1.4"},{"binary_name":"xen-hypervisor-4.6-amd64","binary_version":"4.6.5-0ubuntu1.4"},{"binary_name":"xen-hypervisor-4.6-arm64","binary_version":"4.6.5-0ubuntu1.4"},{"binary_version":"4.6.5-0ubuntu1.4","binary_name":"xen-hypervisor-4.6-armhf"},{"binary_name":"xen-system-amd64","binary_version":"4.6.5-0ubuntu1.4"},{"binary_name":"xen-system-arm64","binary_version":"4.6.5-0ubuntu1.4"},{"binary_name":"xen-system-armhf","binary_version":"4.6.5-0ubuntu1.4"},{"binary_name":"xen-utils-4.6","binary_version":"4.6.5-0ubuntu1.4"},{"binary_version":"4.6.5-0ubuntu1.4","binary_name":"xen-utils-common"},{"binary_name":"xenstore-utils","binary_version":"4.6.5-0ubuntu1.4"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-46842.json"}},{"package":{"name":"xen","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/xen?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.9.0-0ubuntu3","4.9.0-0ubuntu4","4.9.2-0ubuntu1"],"ecosystem_specific":{"binaries":[{"binary_name":"libxen-4.9","binary_version":"4.9.2-0ubuntu1"},{"binary_version":"4.9.2-0ubuntu1","binary_name":"libxenstore3.0"},{"binary_version":"4.9.2-0ubuntu1","binary_name":"xen-hypervisor-4.6-amd64"},{"binary_version":"4.9.2-0ubuntu1","binary_name":"xen-hypervisor-4.6-arm64"},{"binary_version":"4.9.2-0ubuntu1","binary_name":"xen-hypervisor-4.6-armhf"},{"binary_version":"4.9.2-0ubuntu1","binary_name":"xen-hypervisor-4.7-amd64"},{"binary_name":"xen-hypervisor-4.7-arm64","binary_version":"4.9.2-0ubuntu1"},{"binary_name":"xen-hypervisor-4.7-armhf","binary_version":"4.9.2-0ubuntu1"},{"binary_name":"xen-hypervisor-4.8-amd64","binary_version":"4.9.2-0ubuntu1"},{"binary_name":"xen-hypervisor-4.8-arm64","binary_version":"4.9.2-0ubuntu1"},{"binary_version":"4.9.2-0ubuntu1","binary_name":"xen-hypervisor-4.8-armhf"},{"binary_version":"4.9.2-0ubuntu1","binary_name":"xen-hypervisor-4.9-amd64"},{"binary_name":"xen-hypervisor-4.9-arm64","binary_version":"4.9.2-0ubuntu1"},{"binary_name":"xen-hypervisor-4.9-armhf","binary_version":"4.9.2-0ubuntu1"},{"binary_name":"xen-system-amd64","binary_version":"4.9.2-0ubuntu1"},{"binary_name":"xen-system-arm64","binary_version":"4.9.2-0ubuntu1"},{"binary_version":"4.9.2-0ubuntu1","binary_name":"xen-system-armhf"},{"binary_name":"xen-utils-4.9","binary_version":"4.9.2-0ubuntu1"},{"binary_name":"xen-utils-common","binary_version":"4.9.2-0ubuntu1"},{"binary_name":"xenstore-utils","binary_version":"4.9.2-0ubuntu1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-46842.json"}},{"package":{"name":"xen","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/xen?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.9.2-0ubuntu2","4.9.2-0ubuntu6","4.9.2-0ubuntu7","4.11.3+24-g14b62ab3e5-1ubuntu1","4.11.3+24-g14b62ab3e5-1ubuntu2","4.11.3+24-g14b62ab3e5-1ubuntu2.2","4.11.3+24-g14b62ab3e5-1ubuntu2.3"],"ecosystem_specific":{"binaries":[{"binary_name":"libxencall1","binary_version":"4.11.3+24-g14b62ab3e5-1ubuntu2.3"},{"binary_name":"libxendevicemodel1","binary_version":"4.11.3+24-g14b62ab3e5-1ubuntu2.3"},{"binary_name":"libxenevtchn1","binary_version":"4.11.3+24-g14b62ab3e5-1ubuntu2.3"},{"binary_name":"libxenforeignmemory1","binary_version":"4.11.3+24-g14b62ab3e5-1ubuntu2.3"},{"binary_name":"libxengnttab1","binary_version":"4.11.3+24-g14b62ab3e5-1ubuntu2.3"},{"binary_version":"4.11.3+24-g14b62ab3e5-1ubuntu2.3","binary_name":"libxenmisc4.11"},{"bina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