CVE Catalog

CVE-2026-16730

MediumCVSS 5.5
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.15%

5th percentile - higher than 5% of all known CVEs

Summary

In dbus-broker, when the process file-descriptor limit is reached, EMFILE/ENFILE errors during peer setup (notably SO_PEERPIDFD) are handled as fatal failures, causing the broker to exit. A local attacker who can open many connections to the user session bus can trigger this and deny service to the desktop session. Flatpak applications can reach the host session bus through the dbus proxy.

Risk Assessment

The risk is a denial of service (DoS) attack on the user's desktop session by exhausting file-descriptor limits, potentially making the system unusable.

Recommendation

Update dbus-broker to a version that properly handles EMFILE/ENFILE errors without causing the broker to exit.

Related vulnerabilities

Original NVD description (English source)

A flaw was found in dbus-broker. When the process file-descriptor limit is reached, EMFILE/ENFILE errors during peer setup (notably SO_PEERPIDFD) are handled as fatal failures, causing the broker to exit. A local attacker who can open many connections to the user session bus can trigger this and deny service to the desktop session. Flatpak applications can reach the host session bus through the dbus proxy.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS