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

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-05-14 · updated 2026-06-17
Weakness: CWE-280

Description

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.

Affected products

Red Hat Enterprise Linux 10: all versions — fixed in 0:0.4.5-3.el10_0

How to fix

Upgrade to a fixed version: Red Hat Enterprise Linux 10 0:0.4.5-3.el10_0. Check the vendor advisory for mitigations.

References

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