# CVE-2026-4105: Systemd: systemd: privilege escalation via improper access control in registermachine d-bus method

Status: published. Published: 2026-03-13. Updated: 2026-11-06.

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.

## Remediation

- workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability. (source: CNA: redhat)

## Affected products and versions

- Red Hat / Red Hat Hardened Images (systemd-main): ≥ 260.1-2.1.hum1; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 10 (NetworkManager): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 10 (rpm-ostree): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 10 (systemd): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 7 (systemd): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8 (NetworkManager): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8 (systemd): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9 (NetworkManager): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9 (systemd): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift AI (RHOAI) (rhoai/odh-ai-gateway-operator-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift AI (RHOAI) (rhoai/odh-core-bff-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift AI (RHOAI) (rhoai/odh-dashboard-operator-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift AI (RHOAI) (rhoai/odh-dashboard-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift AI (RHOAI) (rhoai/odh-data-science-pipelines-operator-controller-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift AI (RHOAI) (rhoai/odh-kf-notebook-controller-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift AI (RHOAI) (rhoai/odh-kserve-controller-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift AI (RHOAI) (rhoai/odh-kserve-llmisvc-controller-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift AI (RHOAI) (rhoai/odh-kserve-module-operator-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift AI (RHOAI) (rhoai/odh-kuberay-operator-controller-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift AI (RHOAI) (rhoai/odh-kube-rbac-proxy-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift AI (RHOAI) (rhoai/odh-llama-stack-k8s-operator-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift AI (RHOAI) (rhoai/odh-maas-controller-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift AI (RHOAI) (rhoai/odh-mlflow-operator-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift AI (RHOAI) (rhoai/odh-mlflow-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift AI (RHOAI) (rhoai/odh-mod-arch-agent-ops-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift AI (RHOAI) (rhoai/odh-mod-arch-automl-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift AI (RHOAI) (rhoai/odh-mod-arch-autorag-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift AI (RHOAI) (rhoai/odh-mod-arch-eval-hub-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift AI (RHOAI) (rhoai/odh-mod-arch-gen-ai-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift AI (RHOAI) (rhoai/odh-mod-arch-maas-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift AI (RHOAI) (rhoai/odh-mod-arch-mlflow-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift AI (RHOAI) (rhoai/odh-mod-arch-model-registry-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift AI (RHOAI) (rhoai/odh-model-controller-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift AI (RHOAI) (rhoai/odh-model-registry-operator-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift AI (RHOAI) (rhoai/odh-model-serving-api-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift AI (RHOAI) (rhoai/odh-notebook-controller-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift AI (RHOAI) (rhoai/odh-ogx-k8s-operator-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift AI (RHOAI) (rhoai/odh-ogx-module-operator-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift AI (RHOAI) (rhoai/odh-training-operator-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift AI (RHOAI) (rhoai/odh-trustyai-service-operator-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift AI (RHOAI) (rhoai/odh-workbenches-operator-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift Container Platform 4 (NetworkManager): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift Container Platform 4 (openshift/ose-rhel-coreos-8): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift Container Platform 4 (openshift/ose-rhel-coreos-9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift Container Platform 4 (systemd): Version range not reported. Source: CNA: redhat

## Severity and prioritization

- CVSS 3.1: 6.7 (medium); CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H; source: CNA: redhat

- CVSS 3.1: 6.7 (medium); CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H; source: NVD: secalert@redhat.com

- CISA KEV: No listing in collected sources

- EPSS: 0.15% as of 2026-11-05; percentile 4.23%

- SSVC: exploitation none; automatable no; technical impact total; source ADP: CISA-ADP

- Weaknesses: CWE-284

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://access.redhat.com/errata/RHSA-2026:7299 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/security/cve/CVE-2026-4105 (CNA: redhat; vdb-entry, x_refsource_REDHAT)

- https://bugzilla.redhat.com/show_bug.cgi?id=2447262 (CNA: redhat; issue-tracking, x_refsource_REDHAT)

- https://github.com/systemd/systemd/security/advisories/GHSA-4h6x-r8vx-3862 (CNA: redhat)

- https://access.redhat.com/errata/RHSA-2026:7299 (secalert@redhat.com)

- https://access.redhat.com/security/cve/CVE-2026-4105 (secalert@redhat.com)

- https://bugzilla.redhat.com/show_bug.cgi?id=2447262 (secalert@redhat.com)

- https://github.com/systemd/systemd/security/advisories/GHSA-4h6x-r8vx-3862 (secalert@redhat.com)

## Provenance

- CNA: redhat: https://www.cve.org/CVERecord?id=CVE-2026-4105; retrieved 2026-11-06; source updated 2026-11-06

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-4105; retrieved 2026-11-06; source updated 2026-11-05

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-4105; retrieved 2026-11-05; source updated Not reported

Revision: 06b2138278ca7d94c2a9e9083d10700967c0b47fc29e24925167c5943dcc24ca

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