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

> A local unprivileged user can escalate privileges to root by exploiting improper access control in the systemd-machined D-Bus method.

- **Severity:** Medium 6.7 (`CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 13 Mar 2026
- **Updated:** 1 Sep 2026
- **Also known as:** CLSA-2026-1776345550, DEBIAN-CVE-2026-4105, ECHO-230a-8355-8606, GHSA-4h6x-r8vx-3862, OESA-2026-1912, OESA-2026-1913, SUSE-SU-2026:0991-1

## What is CVE-2026-4105?

CVE-2026-4105 is a medium-severity vulnerability in Red Hat Enterprise Linux 10, published on 13 Mar 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

### Official 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.

Weakness: CWE-284 (Improper Access Control)

## Which versions are affected by CVE-2026-4105?


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `systemd` | SUSE:Linux Enterprise Server 12 SP5-LTSS | All versions | 228-157.75.1 |
| `systemd` | SUSE:Linux Enterprise Server LTSS Extended Security 12 SP5 | All versions | 228-157.75.1 |

## How do I fix CVE-2026-4105?

Apply the vendor's patch.

## Is CVE-2026-4105 being exploited?

There is no known exploitation of CVE-2026-4105 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-4105 and fix it if it is affected.

What it is: CVE-2026-4105 is a medium-severity vulnerability in Red Hat Enterprise Linux 10, published on 13 Mar 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-4105 in the wild and no public exploit code.

Affected product: Red Hat Enterprise Linux 10. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-4105/ (Markdown: https://insights.sbomify.com/CVE-2026-4105/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-4105
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-4105
- OSV: https://osv.dev/vulnerability/CVE-2026-4105

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-4105/
Summaries are generated and may contain mistakes; the official description above is the record.