# CVE-2025-3931: Yggdrasil: local privilege escalation in yggdrasil

Status: published. Published: 2025-05-14. Updated: 2026-11-04.

A flaw was found in Yggdrasil, which acts as a system broker, allowing the processes to communicate to other children's "worker" processes through the DBus component. Yggdrasil creates a DBus method to dispatch messages to workers. However, it misses authentication and authorization checks, allowing every system user to call it. One available Yggdrasil worker acts as a package manager with capabilities to create and enable new repositories and install or remove packages. 

This flaw allows an attacker with access to the system to leverage the lack of authentication on the dispatch message to force the Yggdrasil worker to install arbitrary RPM packages. This issue results in local privilege escalation, enabling the attacker to access and modify sensitive system data.

## Remediation

- workaround: Mitigation is either unavailable or does not meet Red Hat Product Security standards for usability, deployment, applicability, or stability. (source: CNA: redhat)

## Affected products and versions

-  /  (yggdrasil): ≥ 0; < 0.4.7 (affected, semver). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 10 (yggdrasil): ≥ 0:0.4.5-3.el10_0; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 10 (rhc-worker-playbook): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8 (rhc-worker-playbook): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9 (rhc-worker-playbook): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Satellite 6 (yggdrasil): Version range not reported. Source: CNA: redhat

## Severity and prioritization

- CVSS 3.1: 7.8 (high); CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H; source: CNA: redhat

- CVSS 3.1: 7.8 (high); CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H; source: NVD: secalert@redhat.com

- CISA KEV: No listing in collected sources

- EPSS: 0.18% as of 2026-11-04; percentile 7.75%

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

- Weaknesses: CWE-280

## Exploit evidence

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

## References

- https://access.redhat.com/errata/RHSA-2025:7592 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/security/cve/CVE-2025-3931 (CNA: redhat; vdb-entry, x_refsource_REDHAT)

- https://bugzilla.redhat.com/show_bug.cgi?id=2362345 (CNA: redhat; issue-tracking, x_refsource_REDHAT)

- https://github.com/RedHatInsights/yggdrasil/pull/336 (CNA: redhat)

- https://access.redhat.com/errata/RHSA-2025:7592 (secalert@redhat.com)

- https://access.redhat.com/security/cve/CVE-2025-3931 (secalert@redhat.com)

- https://bugzilla.redhat.com/show_bug.cgi?id=2362345 (secalert@redhat.com)

- https://github.com/RedHatInsights/yggdrasil/pull/336 (secalert@redhat.com)

## Provenance

- CNA: redhat: https://www.cve.org/CVERecord?id=CVE-2025-3931; retrieved 2026-11-04; source updated 2026-11-04

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-3931; retrieved 2026-11-05; source updated 2026-11-04

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2025-3931; retrieved 2026-11-04; source updated Not reported

Revision: adc3930fb925f8782a038777d904c2d205fb0a095dacba99e061ea51cc161869

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