CVE-2026-4105
Systemd: systemd: privilege escalation via improper access control in registermachine d-bus method
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.
INFO
Published Date :
March 13, 2026, 7:55 p.m.
Last Modified :
March 16, 2026, 2:53 p.m.
Remotely Exploit :
No
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | MITRE-CVE | ||||
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Update systemd to the latest version.
- Validate the 'class' parameter in RegisterMachine D-Bus method.
- Apply vendor-specific security patches.
Public PoC/Exploit Available at Github
CVE-2026-4105 has a 1 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-4105.
| URL | Resource |
|---|---|
| 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 |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-4105 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-4105
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Proof-of-concept exploits and reproduction labs for CVEs analyzed by the Exploit Intelligence Platform
cves exploits proof-of-concept
Shell Python PHP Ruby JavaScript C# Java HTML C GDB
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-4105 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-4105 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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New CVE Received by [email protected]
Mar. 13, 2026
Action Type Old Value New Value 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. Added CVSS V3.1 AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H Added CWE CWE-284 Added Reference https://access.redhat.com/security/cve/CVE-2026-4105 Added Reference https://bugzilla.redhat.com/show_bug.cgi?id=2447262 Added Reference https://github.com/systemd/systemd/security/advisories/GHSA-4h6x-r8vx-3862