cve-2023-46839
Vulnerability from cvelistv5
Published
2024-03-20 10:35
Modified
2024-11-21 19:17
Severity ?
EPSS score ?
Summary
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.
References
{
"containers": {
"adp": [
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"providerMetadata": {
"dateUpdated": "2024-08-02T20:53:21.878Z",
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
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"references": [
{
"tags": [
"x_transferred"
],
"url": "https://xenbits.xenproject.org/xsa/advisory-449.html"
}
],
"title": "CVE Program Container"
},
{
"metrics": [
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"cvssV3_1": {
"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"
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"other": {
"content": {
"id": "CVE-2023-46839",
"options": [
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"Exploitation": "none"
},
{
"Automatable": "no"
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"Technical Impact": "partial"
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"role": "CISA Coordinator",
"timestamp": "2024-08-06T14:00:00.793454Z",
"version": "2.0.3"
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"lang": "en",
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"dateUpdated": "2024-11-21T19:17:55.653Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"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"
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "This issue was discovered by Roger Pau Monn\u00e9 of XenServer.\n"
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],
"datePublic": "2024-01-30T12:00:00Z",
"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"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2024-03-20T10:35:52.532Z",
"orgId": "23aa2041-22e1-471f-9209-9b7396fa234f",
"shortName": "XEN"
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"references": [
{
"url": "https://xenbits.xenproject.org/xsa/advisory-449.html"
}
],
"title": "pci: phantom functions assigned to incorrect contexts",
"workarounds": [
{
"lang": "en",
"value": "There is no mitigation (other than not passing through PCI devices\nwith phantom functions to guests).\n"
}
]
}
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"cveMetadata": {
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"assignerShortName": "XEN",
"cveId": "CVE-2023-46839",
"datePublished": "2024-03-20T10:35:52.532Z",
"dateReserved": "2023-10-27T07:55:35.332Z",
"dateUpdated": "2024-11-21T19:17:55.653Z",
"state": "PUBLISHED"
},
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"dataVersion": "5.1",
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"nvd": "{\"cve\":{\"id\":\"CVE-2023-46839\",\"sourceIdentifier\":\"security@xen.org\",\"published\":\"2024-03-20T11:15:08.120\",\"lastModified\":\"2024-11-21T20:15:36.450\",\"vulnStatus\":\"Awaiting Analysis\",\"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.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N\",\"baseScore\":5.3,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"LOW\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":3.9,\"impactScore\":1.4}]},\"references\":[{\"url\":\"https://xenbits.xenproject.org/xsa/advisory-449.html\",\"source\":\"security@xen.org\"},{\"url\":\"https://xenbits.xenproject.org/xsa/advisory-449.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"}]}}"
}
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
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- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.