Bug 2408822 (CVE-2025-58149)

Summary: CVE-2025-58149 xen: Incorrect removal of permissions on PCI device unplug
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Xen. When passing through PCI devices, the detach logic in libxl won't remove access permissions to any 64bit memory BARs the device might have. As a result a domain can still have access to any 64bit memory BAR when such device is no longer assigned to the domain. A buggy or malicious PV guest can access memory of PCI devices no longer assigned to it.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2413413, 2413414, 2413415    
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Description OSIDB Bzimport 2025-10-31 12:01:50 UTC 
When passing through PCI devices, the detach logic in libxl won't remove
access permissions to any 64bit memory BARs the device might have.  As a
result a domain can still have access any 64bit memory BAR when such
device is no longer assigned to the domain.

For PV domains the permission leak allows the domain itself to map the memory
in the page-tables.  For HVM it would require a compromised device model or
stubdomain to map the leaked memory into the HVM domain p2m.