{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2023-46839", "assignerOrgId": "23aa2041-22e1-471f-9209-9b7396fa234f", "state": "PUBLISHED", "assignerShortName": "XEN", "dateReserved": "2023-10-27T07:55:35.332Z", "datePublished": "2024-03-20T10:35:52.532Z", "dateUpdated": "2025-11-04T18:18:53.943Z"}, "containers": {"cna": {"title": "pci: phantom functions assigned to incorrect contexts", "datePublic": "2024-01-30T12:00:00.000Z", "descriptions": [{"lang": "en", "value": "PCI devices can make use of a functionality called phantom functions,\nthat when enabled allows the device to generate requests using the IDs\nof functions that are otherwise unpopulated. This allows a device to\nextend the number of outstanding requests.\n\nSuch phantom functions need an IOMMU context setup, but failure to\nsetup the context is not fatal when the device is assigned. Not\nfailing device assignment when such failure happens can lead to the\nprimary device being assigned to a guest, while some of the phantom\nfunctions are assigned to a different domain.\n"}], "impacts": [{"descriptions": [{"lang": "en", "value": "Under certain circumstances a malicious guest assigned a PCI device\nwith phantom functions may be able to access memory from a previous\nowner of the device.\n"}]}], "affected": [{"defaultStatus": "unknown", "product": "Xen", "vendor": "Xen", "versions": [{"status": "unknown", "version": "consult Xen advisory XSA-449"}]}], "configurations": [{"lang": "en", "value": "Systems running all version of Xen are affected.\n\nOnly x86 systems are vulnerable. Arm systems are not vulnerable.\n\nOnly systems using PCI passthrough of devices with phantom functions\nare affected.\n"}], "workarounds": [{"lang": "en", "value": "There is no mitigation (other than not passing through PCI devices\nwith phantom functions to guests).\n"}], "credits": [{"lang": "en", "type": "finder", "value": "This issue was discovered by Roger Pau Monn\u00e9 of XenServer.\n"}], "references": [{"url": "https://xenbits.xenproject.org/xsa/advisory-449.html"}], "providerMetadata": {"orgId": "23aa2041-22e1-471f-9209-9b7396fa234f", "shortName": "XEN", "dateUpdated": "2024-03-20T10:35:52.532Z"}}, "adp": [{"title": "CVE Program Container", "references": [{"url": "https://xenbits.xenproject.org/xsa/advisory-449.html", "tags": ["x_transferred"]}, {"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/XLL6SQ6IKFYXLYWITYZCRV5IBRK5G35R/"}, {"url": "http://xenbits.xen.org/xsa/advisory-449.html"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-04T18:18:53.943Z"}}, {"problemTypes": [{"descriptions": [{"type": "CWE", "lang": "en", "description": "CWE-noinfo Not enough information"}]}], "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.3, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "LOW"}}, {"other": {"type": "ssvc", "content": {"timestamp": "2024-08-06T14:00:00.793454Z", "id": "CVE-2023-46839", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-11-21T19:17:55.653Z"}}]}}

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{"cveTags": [], "descriptions": [{"lang": "en", "value": "PCI devices can make use of a functionality called phantom functions,\nthat when enabled allows the device to generate requests using the IDs\nof functions that are otherwise unpopulated. This allows a device to\nextend the number of outstanding requests.\n\nSuch phantom functions need an IOMMU context setup, but failure to\nsetup the context is not fatal when the device is assigned. Not\nfailing device assignment when such failure happens can lead to the\nprimary device being assigned to a guest, while some of the phantom\nfunctions are assigned to a different domain.\n"}, {"lang": "es", "value": "Los dispositivos PCI pueden hacer uso de una funcionalidad llamada funciones fantasma, que cuando est\u00e1 habilitada permite que el dispositivo genere solicitudes utilizando los identificadores de funciones que de otro modo no estar\u00edan completas. Esto permite que un dispositivo extienda la cantidad de solicitudes pendientes. Estas funciones fantasma necesitan una configuraci\u00f3n de contexto IOMMU, pero no configurar el contexto no es fatal cuando el dispositivo est\u00e1 asignado. No fallar la asignaci\u00f3n del dispositivo cuando ocurre tal falla puede provocar que el dispositivo principal se asigne a un invitado, mientras que algunas de las funciones fantasma se asignan a un dominio diferente."}], "id": "CVE-2023-46839", "lastModified": "2025-11-04T19:16:05.110", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 1.4, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}, "published": "2024-03-20T11:15:08.120", "references": [{"source": "security@xen.org", "url": "https://xenbits.xenproject.org/xsa/advisory-449.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://xenbits.xen.org/xsa/advisory-449.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/XLL6SQ6IKFYXLYWITYZCRV5IBRK5G35R/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://xenbits.xenproject.org/xsa/advisory-449.html"}], "sourceIdentifier": "security@xen.org", "vulnStatus": "Awaiting Analysis"}

{"bugzilla": {"description": "xen: phantom functions assigned to incorrect contexts", "id": "2270533", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2270533"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N", "status": "draft"}, "details": ["PCI devices can make use of a functionality called phantom functions,\nthat when enabled allows the device to generate requests using the IDs\nof functions that are otherwise unpopulated. This allows a device to\nextend the number of outstanding requests.\nSuch phantom functions need an IOMMU context setup, but failure to\nsetup the context is not fatal when the device is assigned. Not\nfailing device assignment when such failure happens can lead to the\nprimary device being assigned to a guest, while some of the phantom\nfunctions are assigned to a different domain."], "name": "CVE-2023-46839", "public_date": "2024-03-20T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2023-46839"], "statement": "This vulnerability doesn't affect any supported Red Hat product.", "threat_severity": "Moderate"}

{}