CVE-2024-31146

PCI device pass-through with shared resources

Description

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.

Remediation

Workaround:

  • 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.

Category

7.5
CVSS
Severity: High
CVSS 3.1 •
EPSS 0.03%
Affected: Xen Xen
Published at:
Updated at:

References

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

Frequently Asked Questions

What is the severity of CVE-2024-31146?
CVE-2024-31146 has been scored as a high severity vulnerability.
How to fix CVE-2024-31146?
As a workaround for remediating CVE-2024-31146: 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.
Is CVE-2024-31146 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2024-31146 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2024-31146?
CVE-2024-31146 affects Xen Xen.
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