CVE-2023-46839

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{"affected": [{"affectedData": [{"defaultStatus": "unknown", "product": "Xen", "vendor": "Xen", "versions": [{"status": "unknown", "version": "consult Xen advisory XSA-449"}]}], "source": "security@xen.org"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:xen:xen:*:*:*:*:*:*:x86:*", "matchCriteriaId": "EF4E17C2-244F-4E5A-A5F8-4626CD1AC11A", "vulnerable": true}], "negate": false, "operator": "OR"}]}, {"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:fedoraproject:fedora:39:*:*:*:*:*:*:*", "matchCriteriaId": "B8EDB836-4E6A-4B71-B9B2-AA3E03E0F646", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "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": "2026-06-17T06:31:44.083", "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"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2023-46839", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-08-06T14:00:00.793454Z", "version": "2.0.3"}}]}, "published": "2024-03-20T11:15:08.120", "references": [{"source": "security@xen.org", "tags": ["Patch", "Vendor Advisory"], "url": "https://xenbits.xenproject.org/xsa/advisory-449.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch", "Vendor Advisory"], "url": "http://xenbits.xen.org/xsa/advisory-449.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Third Party Advisory"], "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/XLL6SQ6IKFYXLYWITYZCRV5IBRK5G35R/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch", "Vendor Advisory"], "url": "https://xenbits.xenproject.org/xsa/advisory-449.html"}], "sourceIdentifier": "security@xen.org", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"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"}

{}