CVE-2025-58149

Summary

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.

Affected Software

Weaknesses

Workarounds

Not doing hot unplug of PCI devices will avoid the vulnerability.

Passing through PCI devices to HVM domains only will also limit the impact, as an attacker would require another compromised component to exploit it.

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: yes
  • Technical Impact: partial

CVE Program Container

Additional References

• http://xenbits.xen.org/xsa/advisory-476.html
• http://www.openwall.com/lists/oss-security/2025/10/24/1

References

• https://xenbits.xenproject.org/xsa/advisory-476.html

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