CVE-2026-16730

Dbus-broker: dbus-broker: session bus denial of service via emfile during peer setup

En bref

Sévérité: MEDIUM 5.5
EPSS: EPSS 0.15 % · centile 5 (2026-10-28)
État: PUBLISHED
Publiée: 2026-07-24
Mise à jour: 2026-09-10
Attribuée par: redhat
Statut NVD: Awaiting Analysis

Description

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.

Scores

Version	Score	Vecteur	Évalué par
CVSS 3.1	MEDIUM 5.5	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H	redhat
CVSS 3.1	MEDIUM 5.5	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H	NVD · secalert@redhat.com (Secondary)

Faiblesses (CWE)

CWE-755

Références européennes

ENISA EUVD · EUVD-2026-48559
GCVE · GCVE-0-2026-16730

Produits affectés

Produit	Versions
Red Hat · Red Hat Enterprise Linux 10	unaffected 0:36-5.el10_2 < *
Red Hat · Red Hat Enterprise Linux 9	unaffected 0:28-9.el9_8 < *
Red Hat · Red Hat Update Infrastructure 5	unaffected 1788880445 < *
Red Hat · Red Hat Update Infrastructure 5	unaffected 1788880464 < *
Red Hat · Red Hat Update Infrastructure 5	unaffected 1788880456 < *
Red Hat · Red Hat Update Infrastructure 5	unaffected 1788765051 < *
Red Hat · Red Hat Update Infrastructure 5	unaffected 1788880581 < *
Red Hat · Red Hat Hardened Images
Red Hat · Red Hat OpenShift Container Platform 4

Références

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD