Is CVE-2023-46839 in the CISA KEV catalog?

No. CVE-2023-46839 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2023-46839?

CVE-2023-46839 has a CVSS v3 base score of 5.3 (MEDIUM).

What is the EPSS score for CVE-2023-46839?

CVE-2023-46839 has an EPSS score of 0.80% (52th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2023-46839?

Upgrade xen on debian 12 to 4.17.3+10-g091466ba55-1~deb12u1 or later.

CVE & CISA-KEV Catalog

CVE-2023-46839

MEDIUM

5.3

CVSS v3

NVD

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.

How to fix

Remediation Available

xenDebian

Fixed in:4.17.3+10-g091466ba55-1~deb12u1CVE-2023-46839

Fixed in:4.17.3+10-g091466ba55-1CVE-2023-46839

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityNone

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Exploit Intelligence

0.80%probability of exploitation in 30 days

52ndpercentile

Moderate risk: more likely to be exploited than 52% of all known CVEs.

References

Patch2

Third-Party Advisory1

lists.fedoraproject.org

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-01-13.