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CVE-2023-46839· NVD / CVE Program· CNA XEN

pci: phantom functions assigned to incorrect contexts

Noroxi assessment

Priority: Monitor (action score 21/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.80% (FIRST EPSS); higher than 56.2% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: xen (Alpine:v3.16) 4.16.5-r6; xen (Alpine:v3.18) 4.17.3-r0; xen (Alpine:v3.19) 4.18.0-r3.

Low priority for now. Upgrade to xen (Alpine:v3.16) 4.16.5-r6; xen (Alpine:v3.18) 4.17.3-r0; xen (Alpine:v3.19) 4.18.0-r3 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

MediumCVSS 5.3 · v3.1—No exploit Fix available
Published
Mar 20, 2024
Updated
Jun 17, 2026
EPSS
0.8% · 56th percentile
CWE
—

Report tools

JSON

Action score

21

Monitor

Low priority for now.

CVSS
21 / 40 · 5.3 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.8%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2023-46839

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
xenxen
fedoraprojectfedora

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • fedoraproject fedora39
  • xen xenall versions

Versions reported by the vendor

Affected version ranges reported by the assigning authority (XEN). Independent of NVD's CPE analysis and usually ahead of it.

  • Xen Xen

    • consult Xen advisory XSA-449unknown

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Alpine:v3.16xenbefore 4.16.5-r64.16.5-r6
Alpine:v3.18xenbefore 4.17.3-r04.17.3-r0
Alpine:v3.19xenbefore 4.18.0-r34.18.0-r3
Debian:12xenbefore 4.17.3+10-g091466ba55-1~deb12u14.17.3+10-g091466ba55-1~deb12u1
Debian:13xenbefore 4.17.3+10-g091466ba55-14.17.3+10-g091466ba55-1
openSUSE:Tumbleweedxenbefore 4.18.0_06-1.14.18.0_06-1.1
SUSE:Linux Enterprise High Performance Computing 15 SP1-LTSSxenbefore 4.12.4_44-150100.3.101.14.12.4_44-150100.3.101.1
SUSE:Linux Enterprise High Performance Computing 15 SP2-LTSSxenbefore 4.13.5_10-150200.3.86.14.13.5_10-150200.3.86.1
SUSE:Linux Enterprise High Performance Computing 15 SP3-LTSSxenbefore 4.14.6_10-150300.3.63.14.14.6_10-150300.3.63.1
SUSE:Linux Enterprise Micro 5.3xenbefore 4.16.5_12-150400.4.46.14.16.5_12-150400.4.46.1
SUSE:Linux Enterprise Micro 5.3xenbefore 4.16.5_12-150400.4.46.14.16.5_12-150400.4.46.1
SUSE:Linux Enterprise Micro 5.5xenbefore 4.17.3_06-150500.3.24.14.17.3_06-150500.3.24.1
SUSE:Linux Enterprise Micro 5.5xenbefore 4.17.3_04-150500.3.21.14.17.3_04-150500.3.21.1
SUSE:Linux Enterprise Micro 5.5xenbefore 4.17.3_06-150500.3.24.14.17.3_06-150500.3.24.1
SUSE:Linux Enterprise Micro 5.5xenbefore 4.17.3_04-150500.3.21.14.17.3_04-150500.3.21.1
SUSE:Linux Enterprise Software Development Kit 12 SP5xenbefore 4.12.4_44-3.103.14.12.4_44-3.103.1

Same product

xen: all records

Other highest-scoring records for the same primary product.

  • CVE-2017-10921The grant-table feature in Xen through 4.8.x does not ensure sufficient type counts for a GNTMAP_device_map and GNTMAP_host_map mapping, whi
    41Plan
  • CVE-2017-10920The grant-table feature in Xen through 4.8.x mishandles a GNTMAP_device_map and GNTMAP_host_map mapping, when followed by only a GNTMAP_host
    41Plan
  • CVE-2017-10918Xen through 4.8.x does not validate memory allocations during certain P2M operations, which allows guest OS users to obtain privileged host
    41Plan

Published before and after this one in the same product

  • ← EarlierCVE-2023-46836Jan 5, 2024 · x86: BTC/SRSO fixes not fully effective
    18Monitor
  • ← EarlierCVE-2023-46837Jan 5, 2024 · arm32: The cache may not be properly cleaned/invalidated (take two)
    13Monitor
  • Later →CVE-2023-46840Mar 20, 2024 · VT-d: Failure to quarantine devices in !HVM builds
    16Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
alpine:xen4.16.5-r6 · Alpine:v3.16Package registry (OSV)
debian:xen4.17.3+10-g091466ba55-1~deb12u1 · Debian:12Package registry (OSV)
opensuse:xen4.17.3_04-150500.3.21.1 · openSUSE:Leap 15.5Package registry (OSV)
suse:xen4.14.6_10-150300.3.63.1 · SUSE:Linux Enterprise High Performance Computing 15 SP3-LTSSPackage registry (OSV)
suse:xen4.17.3_04-150500.3.21.1 · SUSE:Linux Enterprise Micro 5.5Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
low · data can be read
Integrity
none
Availability
none
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
Low
Integrity impact
None
Availability impact
None

Weakness class (CWE)

—

CVSS vector

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

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (2 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records