CVE-2024-31146

Summary

When multiple devices share resources and one of them is to be passed through to a guest, security of the entire system and of respective guests individually cannot really be guaranteed without knowing internals of any of the involved guests. Therefore such a configuration cannot really be security-supported, yet making that explicit was so far missing.

Resources the sharing of which is known to be problematic include, but are not limited to

• • PCI Base Address Registers (BARs) of multiple devices mapping to the same page (4k on x86),
• • INTx lines.

Affected Software

Weaknesses

Workarounds

Passing through only SR-IOV virtual functions or devices with well- separated resources will avoid this particular vulnerability. Passing through all devices sharing a given resource to the same guest will also avoid this particular vulnerability.

ADP Enrichment

CVE Program Container

Additional References

• http://xenbits.xen.org/xsa/advisory-461.html
• http://www.openwall.com/lists/oss-security/2024/08/14/3

CISA ADP Vulnrichment

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

References

• https://xenbits.xenproject.org/xsa/advisory-461.html

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