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Full vulnerability report · 2026
CVE-2026-4105High confidence

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

Red Hat · Red Hat Hardened Images

Official source article: Red Hat RHSA-2026:7299 ↗. Check the applicable product and release in the original source.

6.7MediumCVSS 3.1
Recommended action
Scheduled

Medium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority.

Patch available
R
Operational reassessment

Published severity in operational context

Open reassessment dashboard →
Published severityMediumOperational priority:Low, lowered one band.downgradedsince 1 Sep 2026

Evidence used

  • No CISA KEV confirmation is currently recorded.
  • Exploitation requires an existing local or physical foothold with privileges.
  • EPSS is 0.15% for the current model date.

Compensating controls

  • Validate the affected product branch and deploy the verified fixed release.
  • Restrict local access and enforce least privilege on affected hosts.
  • Monitor vendor guidance and exploitation sources for a material change.

Verification

  1. Confirm that the asset runs Red Hat Red Hat Hardened Images and falls inside the recorded affected range.
  2. Verify the installed build against the product-specific fixed version after deployment.
  3. Validate exposure, authentication requirements and compensating controls in the actual environment.
  4. Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Mitigation target: No default targetRemediation target: Normal maintenance

This automated reassessment organises public evidence. It does not know asset exposure, business impact or control effectiveness and does not replace CVSS or a human risk decision.

Distribution package intelligence

Release-specific package status

Debian findings are scoped to the named distribution, release and source package. An absent finding does not mean a package is unaffected.

4 package states
Repository candidate not checked

A published vendor fix does not prove that a matching update is enabled and installable on a particular asset. Confirm the local package candidate before scheduling remediation.

Distribution releaseSource packageVendor stateFixed versionEvidence
Debian trixietrixie · sourcesystemdVendor fix publishedDebian records a fixed source-package version for this release.257.13-1~deb13u1Debian Security Tracker ↗Source updated 5 Oct 2026
Debian bookwormbookworm · sourcesystemdVendor fix publishedDebian records a fixed source-package version for this release.252.39-1~deb12u2Debian Security Tracker ↗Source updated 5 Oct 2026
Debian forkyforky · sourcesystemdVendor fix publishedDebian records a fixed source-package version for this release.260~rc3-1Debian Security Tracker ↗Source updated 5 Oct 2026
Debian sidsid · sourcesystemdVendor fix publishedDebian records a fixed source-package version for this release.260~rc3-1Debian Security Tracker ↗Source updated 5 Oct 2026
Direct vendor intelligence

Authoritative vendor CSAF and VEX advisories

Structured product status and remediation from the issuing vendor. Product-state explanations are always visible; large lists can be searched or downloaded.

1 current
CVE-2026-4105 · CSAF 2.0 · revision 3 · finalRed Hat Product Securitysystemd: systemd: Privilege escalation via improper access control in RegisterMachine D-Bus method
132 known affected

The vendor explicitly identifies these products as affected by this CVE.

  • NetworkManager as a component of Red Hat Enterprise Linux 10
  • NetworkManager-adsl as a component of Red Hat Enterprise Linux 10
  • NetworkManager-bluetooth as a component of Red Hat Enterprise Linux 10
  • NetworkManager-cloud-setup as a component of Red Hat Enterprise Linux 10
  • NetworkManager-config-connectivity-redhat as a component of Red Hat Enterprise Linux 10
  • NetworkManager-config-server as a component of Red Hat Enterprise Linux 10
  • NetworkManager-libnm as a component of Red Hat Enterprise Linux 10
  • NetworkManager-libnm-devel as a component of Red Hat Enterprise Linux 10
  • NetworkManager-ovs as a component of Red Hat Enterprise Linux 10
  • NetworkManager-ppp as a component of Red Hat Enterprise Linux 10
  • NetworkManager-tui as a component of Red Hat Enterprise Linux 10
  • NetworkManager-wifi as a component of Red Hat Enterprise Linux 10
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.
Remediation
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/
Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Choose official national sources for this report. Each advisory shows its original language. Your selection is remembered on this device and included in shared links.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2026-11774

No EUVD known-exploited evidence

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.

EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
6.7 · CVSS 3.1
Advisory evidence
No linked advisory details stored yet
Recommended actionScheduled

Medium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority.

Patch available
01

What, why and how

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.

What

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.

Why

The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.

How

An attacker operating through local access may attempt exploitation with low privileges. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

What

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.

Why

The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.

How

An attacker operating through local access may attempt exploitation with low privileges. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
None recorded

No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.

Likely attack path
local access → Improper Access Control → cause the confidentiality, integrity or availability impact described by the vendor
Attack surface
Local
Privileges required
Low: a basic authenticated account is required
User interaction
Required interaction required
Attack complexity
High: exploitation depends on specific conditions
Security boundary
Unchanged: impact remains within the vulnerable component's security authority
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-284 ↗

CWE-284: Improper Access Control. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H

Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.

AVLocalAttack vector: The attacker needs local access to the vulnerable system.ACHighAttack complexity: Successful exploitation depends on specific conditions outside the attacker's direct control.PRLowPrivileges required: The attacker needs basic user-level privileges.UIRequiredUser interaction: Another user must perform an action for exploitation to succeed.SUnchangedScope: The security impact remains within the vulnerable component's authority.CHighConfidentiality impact: A successful attack can cause a major loss.IHighIntegrity impact: A successful attack can cause a major loss.AHighAvailability impact: A successful attack can cause a major loss.
Post-exploitation / living off the land
The issue can support a local privilege or sandbox boundary transition; normal system utilities may then be available in the gained context.
CWE-284
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

ENISA EUVD · EUVD-2026-11774Official EUVD mapping

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.

Official EUVD record ↗
BSI · German · WID-SEC-2026-0720systemd: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in systemd ausnutzen, um seine Privilegien zu erhöhen und um Sicherheitsvorkehrungen zu umgehen.

Official advisory ↗
03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Patch available
Affected
Fixed
Action
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/
Workaround
No verified workaround is recorded. Limit untrusted access and use least privilege until authoritative guidance is available.
04

Evidence and provenance

Published 13 Mar 2026 · Last source change 1 Sept 2026, 11:59 UTC · CWE-284 · Improper Access Control

CVE recordCVE.org · 5.2
CVSS sourceCNA
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-08-14
European sourceENISA EUVD · EUVD-2026-11774
Product sourceVendor CSAF · Red Hat Product Security
Remediation sourceVendor CSAF · Red Hat Product Security
CWE sourceCNA
NVD statusNVD awaiting enrichment

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates ↗
  1. Affected versionsThe structured affected or fixed version information changed.
    Before
    NetworkManager as a component of Red Hat Enterprise Linux 10; NetworkManager-adsl as a component of Red Hat Enterprise Linux 10; NetworkManager-bluetooth as a component of Red Hat Enterprise Linux 10; NetworkManager-cloud-setup as a component of Red Hat Enterprise Linux 10; NetworkManager-config-connectivity-redhat as a component of Red Hat Enterprise Linux 10; NetworkManager-config-server as a component of Red Hat Enterprise Linux 10; NetworkManager-libnm as a component of Red Hat Enterprise Linux 10; NetworkManager-libnm-devel as a component of Red Hat Enterprise Linux 10; NetworkManager-ovs as a component of Red Hat Enterprise Linux 10; NetworkManager-ppp as a component of Red Hat Enterprise Linux 10; NetworkManager-tui as a component of Red Hat Enterprise Linux 10; NetworkManager-wifi as a component of Red Hat Enterprise Linux 10; NetworkManager-wwan as a component of Red Hat Enterprise Linux 10; NetworkManager.src as a component of Red Hat Enterprise Linux 10; rpm-ostree as a component of Red Hat Enterprise Linux 10; rpm-ostree-libs as a component of Red Hat Enterprise Linux 10; rpm-ostree.src as a component of Red Hat Enterprise Linux 10; systemd as a component of Red Hat Enterprise Linux 10; systemd-boot-unsigned as a component of Red Hat Enterprise Linux 10; systemd-container as a component of Red Hat Enterprise Linux 10; systemd-devel as a component of Red Hat Enterprise Linux 10; systemd-journal-remote as a component of Red Hat Enterprise Linux 10; systemd-libs as a component of Red Hat Enterprise Linux 10; systemd-oomd as a component of Red Hat Enterprise Linux 10; systemd-pam as a component of Red Hat Enterprise Linux 10; systemd-resolved as a component of Red Hat Enterprise Linux 10; systemd-rpm-macros as a component of Red Hat Enterprise Linux 10; systemd-udev as a component of Red Hat Enterprise Linux 10; systemd-ukify as a component of Red Hat Enterprise Linux 10; systemd.src as a component of Red Hat Enterprise Linux 10; and 101 more · Fixed: systemd-main@aarch64 as a component of Red Hat Hardened Images; systemd-main@noarch as a component of Red Hat Hardened Images; systemd-main@src as a component of Red Hat Hardened Images; systemd-main@x86_64 as a component of Red Hat Hardened Images
    After
    NetworkManager as a component of Red Hat Enterprise Linux 10; NetworkManager-adsl as a component of Red Hat Enterprise Linux 10; NetworkManager-bluetooth as a component of Red Hat Enterprise Linux 10; NetworkManager-cloud-setup as a component of Red Hat Enterprise Linux 10; NetworkManager-config-connectivity-redhat as a component of Red Hat Enterprise Linux 10; NetworkManager-config-server as a component of Red Hat Enterprise Linux 10; NetworkManager-libnm as a component of Red Hat Enterprise Linux 10; NetworkManager-libnm-devel as a component of Red Hat Enterprise Linux 10; NetworkManager-ovs as a component of Red Hat Enterprise Linux 10; NetworkManager-ppp as a component of Red Hat Enterprise Linux 10; NetworkManager-tui as a component of Red Hat Enterprise Linux 10; NetworkManager-wifi as a component of Red Hat Enterprise Linux 10; NetworkManager-wwan as a component of Red Hat Enterprise Linux 10; NetworkManager.src as a component of Red Hat Enterprise Linux 10; rpm-ostree as a component of Red Hat Enterprise Linux 10; rpm-ostree-libs as a component of Red Hat Enterprise Linux 10; rpm-ostree.src as a component of Red Hat Enterprise Linux 10; systemd as a component of Red Hat Enterprise Linux 10; systemd-boot-unsigned as a component of Red Hat Enterprise Linux 10; systemd-container as a component of Red Hat Enterprise Linux 10; systemd-devel as a component of Red Hat Enterprise Linux 10; systemd-journal-remote as a component of Red Hat Enterprise Linux 10; systemd-libs as a component of Red Hat Enterprise Linux 10; systemd-oomd as a component of Red Hat Enterprise Linux 10; systemd-pam as a component of Red Hat Enterprise Linux 10; systemd-resolved as a component of Red Hat Enterprise Linux 10; systemd-rpm-macros as a component of Red Hat Enterprise Linux 10; systemd-udev as a component of Red Hat Enterprise Linux 10; systemd-ukify as a component of Red Hat Enterprise Linux 10; systemd.src as a component of Red Hat Enterprise Linux 10; and 102 more · Fixed: systemd-main@aarch64 as a component of Red Hat Hardened Images; systemd-main@noarch as a component of Red Hat Hardened Images; systemd-main@src as a component of Red Hat Hardened Images; systemd-main@x86_64 as a component of Red Hat Hardened Images
    Red Hat Product Security ↗
  2. Affected versionsThe structured affected or fixed version information changed.
    Before
    See the vendor and CVE records for the affected range. · Fixed: 260.1-2.1.hum1 < *
    After
    See the vendor and CVE records for the affected range. · Fixed: Red Hat Hardened Images: 260.1-2.1.hum1 < *
    CNA ↗
Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Fixed release or patch reference recorded
ENISA EUVD · EUVD-2026-11774↗Vendor CSAF · Red Hat Product Security↗CVE authority or vendor reference · Red Hat RHSA-2026:7299↗Official CVE record (CNA and ADP data)↗NVD record↗
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2026-4105 · cve.blacktree.nl