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Fencer Vulns
medium 6.7

CVE-2026-4105 json

Systemd: systemd: privilege escalation via improper access control in registermachine d-bus method

published 2026-03-13 7 mo ago modified 2026-11-06 3 d ago also EUVD-2026-11774

cvss
6.7
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 5%
public exploits
0
none known

Summary

A flaw was found in systemd. The systemd-machined service contains an Improper Access Control vulnerability due to insufficient validation of the class parameter in the RegisterMachine D-Bus (Desktop Bus) method. A local unprivileged user can exploit this by attempting to register a machine with a specific class value, which may leave behind a usable, attacker-controlled machine object. This allows the attacker to invoke methods on the privileged object, leading to the execution of arbitrary commands with root privileges on the host system.

Patch / fix

  • Red Hat Red Hat Hardened Images 260.1-2.1.hum1
  • systemd Debian 12 252.39-1~deb12u2
  • systemd Debian 13 257.13-1~deb13u1
  • systemd Debian 14 260~rc3-1

debian advisories DEBIAN-CVE-2026-4105

  • systemd hummingbird 1 260.1-2.1.hum1
  • systemd-pam hummingbird 1 260.1-2.1.hum1
  • systemd-libs hummingbird 1 260.1-2.1.hum1
  • systemd-udev hummingbird 1 260.1-2.1.hum1
  • systemd-tests hummingbird 1 260.1-2.1.hum1
  • systemd-ukify hummingbird 1 260.1-2.1.hum1
  • systemd-shared hummingbird 1 260.1-2.1.hum1
  • systemd-networkd hummingbird 1 260.1-2.1.hum1

red hat advisories RHSA-2026:7299

  • systemd SLES 16.0, Linux Micro Extras 6.2, Linux Micro 6.2 +1 more 257.13-160000.4.1
  • systemd SLES 16.0, Linux Micro Extras 6.2, Linux Micro 6.2 +1 more 257.13-160000.1.1
  • systemd SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +8 more 249.17-150400.8.55.1
  • systemd SLES for SAP 15 SP6, SLES 15 SP6-LTSS, SLE Module for Package Hub 15 SP7 +2 more 254.27-150600.4.62.1
  • systemd Linux Micro 6.1 254.27-slfo.1.1_4.1
  • systemd Linux Micro 6.0 254.27-3.1
  • systemd SLE Micro 5.2 246.16-150300.7.65.1
  • systemd SLES LTSS Extended Security 12 SP5, SLES 12 SP5-LTSS 228-157.75.1

suse advisories SUSE-SU-2026:23470-1SUSE-SU-2026:23620-1SUSE-SU-2026:23454-1SUSE-SU-2026:20998-1SUSE-SU-2026:21003-1SUSE-SU-2026:21144-1

  • systemd openSUSE Leap 16.0 257.13-160000.4.1
  • systemd-mini openSUSE Leap 16.0 257.13-160000.4.1
  • systemd openSUSE Tumbleweed 259.5-1.3
  • systemd openSUSE Leap 16.0 257.13-160000.1.1

opensuse advisories openSUSE-SU-2026:21754-1openSUSE-SU-2026:10624-1openSUSE-SU-2026:20471-1

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-2026-4105 updated cvss 6.7

systemd: systemd: Privilege escalation via improper access control in RegisterMachine D-Bus method

  • Red Hat Enterprise Linux 7 systemd, libgudev1, systemd-libs, systemd-sysv, systemd-python, systemd-networkd, +2 more Red Hat Enterprise Linux 8 systemd, systemd-pam, systemd-libs, systemd-udev, systemd-tests, NetworkManager, +16 more Red Hat Enterprise Linux 9 systemd, systemd-pam, systemd-libs, systemd-oomd, systemd-udev, systemd-ukify, +21 more Red Hat Enterprise Linux 10 systemd, rpm-ostree, NetworkManager Red Hat OpenShift Container Platform 4 systemd, systemd-pam, systemd-libs, systemd-oomd, systemd-udev, systemd-tests, +24 more
    affected: workaround, no fix available “Fix deferred”
  • Red Hat OpenShift AI (RHOAI) rhoai/odh-core-bff-rhel9, rhoai/odh-dashboard-rhel9, rhoai/odh-mod-arch-maas-rhel9, rhoai/odh-mod-arch-automl-rhel9, rhoai/odh-mod-arch-gen-ai-rhel9, rhoai/odh-mod-arch-mlflow-rhel9, +6 more
    under investigation
  • Red Hat Hardened Images systemd 260.1-2.1.hum1, systemd-pam 260.1-2.1.hum1, systemd-libs 260.1-2.1.hum1, systemd-udev 260.1-2.1.hum1, systemd-tests 260.1-2.1.hum1, systemd-ukify 260.1-2.1.hum1, +14 more
    fixed: vendor fix RHSA-2026:7299
  • Red Hat OpenShift AI (RHOAI) rhoai/odh-mlflow-rhel9, rhoai/odh-kube-rbac-proxy-rhel9, rhoai/odh-maas-controller-rhel9, rhoai/odh-mlflow-operator-rhel9, rhoai/odh-model-controller-rhel9, rhoai/odh-ogx-k8s-operator-rhel9, +14 more
    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
total
Assessed
7 mo ago

Exploit prediction

0.17% chance of exploitation in the next 30 days, higher than 5% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 6.7 CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H

Affected products

  • Red Hat Red Hat Hardened Images
  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 7
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat OpenShift AI (RHOAI)
  • Red Hat Red Hat OpenShift Container Platform 4

Classification

Weakness

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.