CVE-2023-46839

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.

Affected Software

Weaknesses

Workarounds

There is no mitigation (other than not passing through PCI devices with phantom functions to guests).

ADP Enrichment

CVE Program Container

Additional References

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

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: partial

References

• https://xenbits.xenproject.org/xsa/advisory-449.html

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