CVE-2023-46839

PCI devices can make use of a functionality called phantom functions, that when enabled allows the device to generate requests using the IDs of functions that are otherwise unpopulated. This allows a device to extend the number of outstanding requests. Such phantom functions need an IOMMU context setup, but failure to setup the context is not fatal when the device is assigned. Not failing device assignment when such failure happens can lead to the primary device being assigned to a guest, while some of the phantom functions are assigned to a different domain.

CVSS v3 5.3 MEDIUM

5.3^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 3.9 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact NONE

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://xenbits.xenproject.org/xsa/advisory-449.html
http://xenbits.xen.org/xsa/advisory-449.html
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/XLL6SQ6IKFYXLYWITYZCRV5IBRK5G35R/
https://xenbits.xenproject.org/xsa/advisory-449.html

Configurations

No configuration.

History

04 Nov 2025, 19:16

Type	Values Removed	Values Added
References		() http://xenbits.xen.org/xsa/advisory-449.html - () https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/XLL6SQ6IKFYXLYWITYZCRV5IBRK5G35R/ -

Information

Published : 2024-03-20 11:15

Updated : 2025-11-04 19:16

NVD link : CVE-2023-46839

Mitre link : CVE-2023-46839

CVE.ORG link : CVE-2023-46839

JSON object : View

Products Affected

No product.

CWE

No CWE.

{"id": "CVE-2023-46839", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Secondary", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "cvssData": {"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"}, "impactScore": 1.4, "exploitabilityScore": 3.9}]}, "published": "2024-03-20T11:15:08.120", "references": [{"url": "https://xenbits.xenproject.org/xsa/advisory-449.html", "source": "security@xen.org"}, {"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", "source": "af854a3a-2127-422b-91ae-364da2661108"}], "vulnStatus": "Awaiting Analysis", "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."}], "lastModified": "2025-11-04T19:16:05.110", "sourceIdentifier": "security@xen.org"}