Bug 2270533 (CVE-2023-46839)

Summary: CVE-2023-46839 xen: phantom functions assigned to incorrect contexts
Product: [Other] Security Response Reporter: Marco Benatto <mbenatto>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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OS: Linux   
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Bug Depends On: 2270534    
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Description Marco Benatto 2024-03-20 20:18:06 UTC 
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.

https://xenbits.xenproject.org/xsa/advisory-449.html
Comment 1 Marco Benatto 2024-03-20 20:19:47 UTC 
Created xen tracking bugs for this issue:

Affects: fedora-all [bug 2270534]