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Fencer Vulns
medium 5.3

CVE-2023-46839 json

pci: phantom functions assigned to incorrect contexts

published 2024-03-20 2 y ago modified 2026-06-17 4 mo ago also EUVD-2023-51005

cvss
5.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.8%
EPSS 0.8% chance of exploitation in 30 days, percentile 57%
public exploits
0
none known

Summary

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.

Patch / fix

  • xen Debian 12 4.17.3+10-g091466ba55-1~deb12u1
  • xen Debian 14, Debian 13 4.17.3+10-g091466ba55-1

debian advisories DEBIAN-CVE-2023-46839

  • xen SLE Module for Server Applications 15 SP5, SLE Module for Basesystem 15 SP5, SLE Micro 5.5 +1 more 4.17.3_06-150500.3.24.1
  • xen SLES for SAP 15 SP4, SLES 15 SP4-LTSS, SLE Micro 5.4 +7 more 4.16.5_12-150400.4.46.1
  • xen SLE Module for Server Applications 15 SP5, SLE Module for Basesystem 15 SP5, SLE Micro 5.5 +1 more 4.17.3_04-150500.3.21.1
  • xen SLES for SAP 12 SP5, SLES 12 SP5, SLE Software Development Kit 12 SP5 4.12.4_44-3.103.1
  • xen SLES for SAP 15 SP3, SLES 15 SP3-LTSS, SLE Micro 5.2 +3 more 4.14.6_10-150300.3.63.1
  • xen SLES for SAP 15 SP2, SLES 15 SP2-LTSS, SLE High Performance Computing 15 SP2-LTSS 4.13.5_10-150200.3.86.1
  • xen SLES for SAP 15 SP1, SLES 15 SP1-LTSS, SLE High Performance Computing 15 SP1-LTSS 4.12.4_44-150100.3.101.1

suse advisories SUSE-SU-2024:0830-1SUSE-SU-2024:0270-1SUSE-SU-2024:0269-1SUSE-SU-2024:0268-1SUSE-SU-2024:0266-1SUSE-SU-2024:0265-1

  • xen openSUSE Tumbleweed 4.18.0_06-1.1

opensuse advisories openSUSE-SU-2024:13648-1

  • xen Alpine 3.17, Alpine 3.16 4.16.5-r6
  • xen Alpine 3.18 4.17.3-r0
  • xen Alpine 3.24, Alpine 3.23, Alpine 3.22 +3 more 4.18.0-r3

alpine advisories ALPINE-CVE-2023-46839

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2023-46839 updated cvss 5.5

xen: phantom functions assigned to incorrect contexts

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2 y ago

Exploit prediction

0.80% chance of exploitation in the next 30 days, higher than 57% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CNA 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Affected products

  • Xen Xen

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.