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.

The remote Oracle Linux 10 host has a package installed that is affected by a vulnerability as referenced in the ELSA-2026-613400 advisory.

    [36-5]
    - Fix session bus denial of service via EMFILE during peer setup.

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Oracle Linux 9 host has a package installed that is affected by a vulnerability as referenced in the ELSA-2026-613550 advisory.

    [28-9]
    - Fix session bus denial of service via EMFILE during peer setup.
    Resolves: RHEL-233014

    [28-8]
    - Switch from useradd to systemd sysusers     Resolves: RHEL-109036

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote MiracleLinux 9 host has a package installed that is affected by a vulnerability as referenced in the AXSA:2026-1736:01 advisory.

    * dbus-broker: dbus-broker: session bus denial of service via EMFILE during peer setup (CVE-2026-16730)

Tenable has extracted the preceding description block directly from the MiracleLinux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote AlmaLinux 10 host has a package installed that is affected by a vulnerability as referenced in the ALSA-2026:61340 advisory.

    * dbus-broker: dbus-broker: session bus denial of service via EMFILE during peer setup (CVE-2026-16730)

Tenable has extracted the preceding description block directly from the AlmaLinux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote RockyLinux 10 host has packages installed that are affected by a vulnerability as referenced in the RLSA-2026:61340 advisory.

    * dbus-broker: dbus-broker: session bus denial of service via EMFILE during peer setup (CVE-2026-16730)

Tenable has extracted the preceding description block directly from the RockyLinux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote RockyLinux 9 host has packages installed that are affected by a vulnerability as referenced in the RLSA-2026:61355 advisory.

    * dbus-broker: dbus-broker: session bus denial of service via EMFILE during peer setup (CVE-2026-16730)

Tenable has extracted the preceding description block directly from the RockyLinux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote AlmaLinux 9 host has a package installed that is affected by a vulnerability as referenced in the ALSA-2026:61355 advisory.

    * dbus-broker: dbus-broker: session bus denial of service via EMFILE during peer setup (CVE-2026-16730)

Tenable has extracted the preceding description block directly from the AlmaLinux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 9 host has a package installed that is affected by a vulnerability as referenced in the RHSA-2026:61355 advisory.

    dbus-broker is an implementation of a message bus as defined by the D-Bus specification. Its aim is to     provide high performance and reliability, while keeping compatibility to the D-Bus reference     implementation. It is exclusively written for Linux systems, and makes use of many modern features     provided by recent Linux kernel releases.

    Security Fix(es):

    * dbus-broker: dbus-broker: session bus denial of service via EMFILE during peer setup (CVE-2026-16730)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 10 host has a package installed that is affected by a vulnerability as referenced in the RHSA-2026:61340 advisory.

    dbus-broker is an implementation of a message bus as defined by the D-Bus specification. Its aim is to     provide high performance and reliability, while keeping compatibility to the D-Bus reference     implementation. It is exclusively written for Linux systems, and makes use of many modern features     provided by recent Linux kernel releases.

    Security Fix(es):

    * dbus-broker: dbus-broker: session bus denial of service via EMFILE during peer setup (CVE-2026-16730)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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.
    (CVE-2026-16730)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Type	Severity
342710	Oracle Linux 10 : ELSA-2026-61340-0: / dbus-broker (ELSA-2026-613400)	Nessus	Oracle Linux Local Security Checks	Local	medium
342352	Oracle Linux 9 : ELSA-2026-61355-0: / dbus-broker (ELSA-2026-613550)	Nessus	Oracle Linux Local Security Checks	Local	medium
342327	MiracleLinux 9 : dbus-broker-28-9.el9_8 (AXSA:2026-1736:01)	Nessus	Miracle Linux Local Security Checks	Local	medium
342174	AlmaLinux 10 : dbus-broker (ALSA-2026:61340)	Nessus	Alma Linux Local Security Checks	Local	medium
342152	RockyLinux 10 : dbus-broker (RLSA-2026:61340)	Nessus	Rocky Linux Local Security Checks	Local	medium
342151	RockyLinux 9 : dbus-broker (RLSA-2026:61355)	Nessus	Rocky Linux Local Security Checks	Local	medium
342133	AlmaLinux 9 : dbus-broker (ALSA-2026:61355)	Nessus	Alma Linux Local Security Checks	Local	medium
341729	RHEL 9 : dbus-broker (RHSA-2026:61355)	Nessus	Red Hat Local Security Checks	Local	medium
341728	RHEL 10 : dbus-broker (RHSA-2026:61340)	Nessus	Red Hat Local Security Checks	Local	medium
329673	Linux Distros Unpatched Vulnerability : CVE-2026-16730	Nessus	Misc.	Local	medium

Detections

Analytics

CVE-2026-16730

medium

Tenable Plugins

medium

medium

medium

medium

medium

medium

medium

medium

medium

medium