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CVE-2023-46839

5.3 · MEDIUM

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.

Published Mar 20, 2024EPSS 0.80%

Overview

CVE-2023-46839 is a medium-severity vulnerability. It was published on March 20, 2024 and has a CVSS 3.1 base score of 5.3 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refxenbits.xenproject.org/xsa/advisory-449.htmlRefxenbits.xen.org/xsa/advisory-449.htmlReflists.fedoraproject.org/archives/list/[email protected]/message/XLL6SQ6IKFYXLYWITYZCRV5IBRK5G35R/Refxenbits.xenproject.org/xsa/advisory-449.html

How CyberStrike helps

Frequently asked questions

What is CVE-2023-46839?

CVE-2023-46839 is a medium-severity vulnerability. It was published on March 20, 2024 and has a CVSS 3.1 base score of 5.3 (MEDIUM).

How severe is CVE-2023-46839?

This vulnerability has a CVSS 3.1 base score of 5.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2023-46839?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2023-46839?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2023-46839 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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