CVE-2026-4105

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

View on CVE.org

Published Mar 13, 2026 CVSS 3.1 · 6.7 Medium EPSS < 1% KEV · Not listed

Description

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.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Red Hat

Red Hat Hardened Images

affected

Version	Status	Constraints
`260.1-2.1.hum1`	unaffected	< *

Red Hat Red Hat Enterprise Linux 10 affected —

Red Hat Red Hat Enterprise Linux 10 affected —

Red Hat Red Hat Enterprise Linux 10 affected —

Red Hat Red Hat Enterprise Linux 7 affected —

Red Hat Red Hat Enterprise Linux 8 affected —

Red Hat Red Hat Enterprise Linux 8 affected —

Red Hat Red Hat Enterprise Linux 9 affected —

Red Hat Red Hat Enterprise Linux 9 affected —

Red Hat Red Hat OpenShift AI (RHOAI) unaffected —

Red Hat Red Hat OpenShift AI (RHOAI) unknown —

Red Hat Red Hat OpenShift AI (RHOAI) unaffected —

Red Hat Red Hat OpenShift AI (RHOAI) unknown —

Red Hat Red Hat OpenShift AI (RHOAI) unaffected —

Red Hat Red Hat OpenShift AI (RHOAI) unknown —

Red Hat Red Hat OpenShift AI (RHOAI) unaffected —

Red Hat Red Hat OpenShift AI (RHOAI) unaffected —

Red Hat Red Hat OpenShift AI (RHOAI) unaffected —

Red Hat Red Hat OpenShift AI (RHOAI) unaffected —

Red Hat Red Hat OpenShift AI (RHOAI) unaffected —

Red Hat Red Hat OpenShift AI (RHOAI) unaffected —

Red Hat Red Hat OpenShift AI (RHOAI) unaffected —

Red Hat Red Hat OpenShift AI (RHOAI) unaffected —

Red Hat Red Hat OpenShift AI (RHOAI) unaffected —

Red Hat Red Hat OpenShift AI (RHOAI) unknown —

Red Hat Red Hat OpenShift AI (RHOAI) unknown —

Red Hat Red Hat OpenShift AI (RHOAI) unknown —

Red Hat Red Hat OpenShift AI (RHOAI) unknown —

Red Hat Red Hat OpenShift AI (RHOAI) unknown —

Red Hat Red Hat OpenShift AI (RHOAI) unknown —

Red Hat Red Hat OpenShift AI (RHOAI) unknown —

Red Hat Red Hat OpenShift AI (RHOAI) unknown —

Red Hat Red Hat OpenShift AI (RHOAI) unaffected —

Red Hat Red Hat OpenShift AI (RHOAI) unaffected —

Red Hat Red Hat OpenShift AI (RHOAI) unaffected —

Red Hat Red Hat OpenShift AI (RHOAI) unknown —

Red Hat Red Hat OpenShift AI (RHOAI) unaffected —

Red Hat Red Hat OpenShift AI (RHOAI) unaffected —

Red Hat Red Hat OpenShift AI (RHOAI) unaffected —

Red Hat Red Hat OpenShift AI (RHOAI) unaffected —

Red Hat Red Hat OpenShift AI (RHOAI) unaffected —

Red Hat Red Hat OpenShift Container Platform 4 affected —

Red Hat Red Hat OpenShift Container Platform 4 affected —

Red Hat Red Hat OpenShift Container Platform 4 affected —

Red Hat Red Hat OpenShift Container Platform 4 affected —

No data.

No data.

Vendor Product Versions

Redhat

Enterprise Linux

Version	Status	Scheme	Platform
`—`	affected	—	—

Redhat

Openshift Container Platform

Version	Status	Scheme	Platform
`—`	affected	—	—

Remediation

Vendor 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.

Tracking

Sign in to view the affected projects.

Advisories

Source	ID	Title
Debian DLA	DLA-4533-1	systemd security update

Metrics

No CVSS v4.0

Attack Vector Local

Attack Complexity High

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction Required

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.165% probability within 30 days)

Exploitation none

Automatable no

Technical Impact total

References

Link	Providers
https://access.redhat.com/errata/RHSA-2026:7299
https://access.redhat.com/security/cve/CVE-2026-4105
https://bugzilla.redhat.com/show_bug.cgi?id=2447262
https://github.com/systemd/systemd/security/advisories/GHSA-4h6x-r8vx-3862
https://nvd.nist.gov/vuln/detail/CVE-2026-4105
https://www.cve.org/CVERecord?id=CVE-2026-4105

History

Nov 6, 2026 8:00 AM First appearance in the feed. Affected versions updated. Affected vendors updated View changes

Type	Values Removed	Values Added
First Time appeared		Redhat openshift Ai
CPEs		cpe:/a:redhat:openshift_ai
Vendors & Products		Redhat openshift Ai

Nov 5, 2026 9:30 PM First appearance in the feed. Affected versions updated. Affected vendors updated View changes

Type	Values Removed	Values Added
First Time appeared		Redhat rhel Els
CPEs	cpe:/o:redhat:enterprise_linux:10 cpe:/o:redhat:enterprise_linux:7 cpe:/o:redhat:enterprise_linux:8 cpe:/o:redhat:enterprise_linux:9	cpe:/a:redhat:enterprise_linux:10 cpe:/a:redhat:enterprise_linux:8 cpe:/a:redhat:enterprise_linux:9 cpe:/o:redhat:rhel_els:7
Vendors & Products		Redhat rhel Els

Apr 30, 2026 5:15 PM Added references View changes

Type	Values Removed	Values Added
References		https://access.redhat.com/errata/RHSA-2026:7299

Apr 9, 2026 6:00 PM First appearance in the feed. Affected versions updated. Affected vendors updated View changes

Type	Values Removed	Values Added
First Time appeared		Redhat hummingbird
CPEs		cpe:/a:redhat:hummingbird:1
Vendors & Products		Redhat hummingbird

Mar 16, 2026 10:15 AM First appearance in the feed. Affected vendors updated View changes

Type	Values Removed	Values Added
First Time appeared		Redhat openshift Container Platform
Vendors & Products		Redhat openshift Container Platform

Mar 13, 2026 4:15 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}`

Mar 13, 2026 2:15 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics	cvssV3_1 `{'score': 7.8, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'}`	cvssV3_1 `{'score': 6.7, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H'}`

Mar 13, 2026 12:15 PM Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
References		https://nvd.nist.gov/vuln/detail/CVE-2026-4105 https://www.cve.org/CVERecord?id=CVE-2026-4105
Metrics	threat_severity `None`	threat_severity `Moderate`

Mar 13, 2026 9:15 AM Description updated. Title updated. First appearance in the feed. Weaknesses updated. Affected versions updated. Affected vendors updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
Description		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.
Title		Systemd: systemd: privilege escalation via improper access control in registermachine d-bus method
First Time appeared		Redhat Redhat enterprise Linux Redhat openshift
Weaknesses		CWE-284
CPEs		cpe:/a:redhat:openshift:4 cpe:/o:redhat:enterprise_linux:10 cpe:/o:redhat:enterprise_linux:7 cpe:/o:redhat:enterprise_linux:8 cpe:/o:redhat:enterprise_linux:9
Vendors & Products		Redhat Redhat enterprise Linux Redhat openshift
References		https://access.redhat.com/security/cve/CVE-2026-4105 https://bugzilla.redhat.com/show_bug.cgi?id=2447262 https://github.com/systemd/systemd/security/advisories/GHSA-4h6x-r8vx-3862
Metrics		cvssV3_1 `{'score': 7.8, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'}`

Earlier changes (4)

Subscriptions

Redhat Enterprise Linux Hummingbird Openshift Openshift Ai Openshift Container Platform Rhel Els

Weaknesses

CWE-284

Sources

CVE record Updated: Nov 6, 2026, 7:51 AM

Status: PUBLISHED
Assigner: redhat
Published: Mar 13, 2026, 8:52 AM
Updated: Nov 6, 2026, 7:51 AM
Reserved: Mar 13, 2026, 8:24 AM

View source JSON

Vulnrichment Updated: Mar 13, 2026, 4:03 PM

Updated: Mar 13, 2026, 4:03 PM

NVD Updated: Nov 6, 2026, 8:17 AM

Status: Awaiting Analysis
Published: Mar 13, 2026, 7:55 PM
Modified: Nov 6, 2026, 8:17 AM

View source JSON

Red Hat Updated: Mar 13, 2026, 12:00 AM

Severity: Moderate
Public date: Mar 13, 2026, 12:00 AM

View source Bugzilla JSON

OpenCVE enrichment Updated: Apr 10, 2026, 9:46 AM

Updated: Apr 10, 2026, 9:46 AM

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OpenShift Container Platform 4", "vendor": "Red Hat"}, {"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/a:redhat:openshift:4"], "defaultStatus": "affected", "packageName": "systemd", "product": "Red Hat OpenShift Container Platform 4", "vendor": "Red Hat"}], "source": "secalert@redhat.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}, {"lang": "es", "value": "Se encontr\u00f3 un defecto en systemd. El servicio systemd-machined contiene una vulnerabilidad de control de acceso impropio debido a la validaci\u00f3n insuficiente del par\u00e1metro class en el m\u00e9todo RegisterMachine de D-Bus (Desktop Bus). Un usuario local sin privilegios puede explotar esto al intentar registrar una m\u00e1quina con un valor de clase espec\u00edfico, lo que puede dejar un objeto de m\u00e1quina utilizable y controlado por el atacante. Esto permite al atacante invocar m\u00e9todos en el objeto privilegiado, lo que lleva a la ejecuci\u00f3n de comandos arbitrarios con privilegios de root en el sistema anfitri\u00f3n."}], "id": "CVE-2026-4105", "lastModified": "2026-11-06T08:17:26.600", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 6.7, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 0.8, "impactScore": 5.9, "source": "secalert@redhat.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-4105", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-03-13T16:03:09.227569Z", "version": "2.0.3"}}]}, "published": "2026-03-13T19:55:13.673", "references": [{"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:7299"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/security/cve/CVE-2026-4105"}, {"source": "secalert@redhat.com", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2447262"}, {"source": "secalert@redhat.com", "url": "https://github.com/systemd/systemd/security/advisories/GHSA-4h6x-r8vx-3862"}], "sourceIdentifier": "secalert@redhat.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-284"}], "source": "secalert@redhat.com", "type": "Secondary"}]}

{"acknowledgement": "Red Hat would like to thank Asim Viladi Oglu Manizada for reporting this issue.", "bugzilla": {"description": "systemd: systemd: Privilege escalation via improper access control in RegisterMachine D-Bus method", "id": "2447262", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2447262"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.8", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-284", "details": ["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."], "mitigation": {"lang": "en:us", "value": "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."}, "name": "CVE-2026-4105", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "NetworkManager", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "rpm-ostree", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "systemd", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "systemd", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "NetworkManager", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "systemd", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "NetworkManager", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "systemd", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "NetworkManager", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "rhcos", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "systemd", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-03-13T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-4105\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-4105\nhttps://github.com/systemd/systemd/security/advisories/GHSA-4h6x-r8vx-3862"], "statement": "The Red Hat Product Security team has assessed the severity of this vulnerability as Moderate due to environmental limitations on exploitability. Exploitation requires a local unprivileged user with an active logind session, such as a desktop session, which significantly reduces the attack surface compared to vulnerabilities that can be triggered remotely or through standard remote access methods such as SSH. Despite this constraint, successful exploitation results in privilege escalation to root, allowing an attacker to execute arbitrary commands and fully compromise the affected system.", "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": null}], "enrichment": {"confidence": 100.0, "confidence_source": "manual", "scores": [{"score": 100.0, "source": "manual"}]}, "original": {"product": "Red Hat Enterprise Linux 10", "source": "cna", "vendor": "Red Hat"}, "product": "enterprise_linux", "vendor": "redhat"}, {"configurations": [{"platform": null, "status": "affected", "versions": null}], "enrichment": {"confidence": 86.0, "confidence_source": "matching", "scores": [{"score": 86.0, "source": "matching"}]}, "original": {"product": "Red Hat OpenShift Container Platform 4", "source": "cna", "vendor": "Red Hat"}, "product": "openshift_container_platform", "vendor": "redhat"}], "analysis": {"en": {"generated_at": "2026-04-09T20:40:51.151333+00:00", "value": {"mitigation_remediation": ["Apply the latest Red\u00a0Hat security update for systemd that addresses CVE\u20112026\u20114105, following the vendor's guidance for RHEL\u00a07,\u00a08,\u00a09,\u00a010, Hardened Images, and OpenShift\u00a04.", "No temporary workaround is available that meets Red\u00a0Hat's criteria; therefore apply the patch as the sole mitigation strategy.", "After applying the update, test that the RegisterMachine D\u2011Bus method rejects invalid class values from a non\u2011root account to confirm the vulnerability is remediated."], "summary": {"action": "Apply Patch", "impact": "Privilege Escalation"}, "threat_synthesis": {"affected_systems": "The vulnerability affects Red\u00a0Hat products that ship systemd, including Red\u00a0Hat Enterprise Linux\u00a07,\u00a08,\u00a09, and\u00a010, Red\u00a0Hat Hardened Images, and Red\u00a0Hat OpenShift Container Platform\u00a04. No specific affected systemd releases are enumerated, so the issue applies to the default systemd packages supplied in these distributions.", "description_and_impact": "A flaw in systemd allows a local, unprivileged user to register a machine with an invalid class value through the RegisterMachine D\u2011Bus method. Because the class parameter is not properly validated, the attacker can create a machine object that remains accessible. Based on the description, the attacker can then invoke privileged methods on that object, leading to execution of arbitrary commands with root privileges on the host system.", "risk_and_exploitability": "The CVSS score of 6.7 indicates moderate severity, and the EPSS score of under 1\u00a0% suggests a low likelihood of exploitation. The attack requires local, non\u2011root user access and interaction with the D\u2011Bus interface; no publicly available exploit code has been documented, and the vulnerability is not listed in CISA's KEV catalog. The likely vector is local privilege escalation via the RegisterMachine method, after which the attacker achieves full system privileges."}}}}, "created": "2026-03-16T09:37:51.143092+00:00", "updated": "2026-04-10T09:46:30.219504+00:00", "vendors": ["redhat", "redhat$PRODUCT$enterprise_linux", "redhat$PRODUCT$openshift_container_platform"]}