# CVE-2026-16730: dbus-broker: A flaw was found in dbus-broker

CVE-2026-16730 is fixed in dbus-broker on 1 platform, first by RHSA-2026:61340, released July 23, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-16730
- Priority: Routine
- CVSS: 5.5 (moderate)
- EPSS: 0.0015
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jul 23, 2026

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | dbus-broker RHEL 10 | 36-5.el10_2 | [RHSA-2026:61340](https://patchblox.com/security/data/fix/linux/rhsa-2026-61340.md) | Jul 23, 2026 |
| Linux | dbus-broker RHEL 9 | 0:28-9.el9_8 | [RHSA-2026:61355](https://patchblox.com/security/data/fix/linux/rhsa-2026-61355.md) | Sep 13, 2026 |
| Linux | dbus-broker almalinux 10 | 36-5.el10_2 | [ALSA-2026:61340](https://patchblox.com/security/data/fix/linux/alsa-2026-61340.md) | Aug 31, 2026 |
| Linux | dbus-broker almalinux 9 | 28-9.el9_8 | [ALSA-2026:61355](https://patchblox.com/security/data/fix/linux/alsa-2026-61355.md) | Aug 31, 2026 |
| Linux | dbus-broker ol 10 | 0:36-5.el10_2 | [ELSA-2026-61340-0](https://patchblox.com/security/data/fix/linux/elsa-2026-61340-0.md) | Sep 1, 2026 |
| Linux | dbus-broker ol 9 | 0:28-9.el9_8 | [ELSA-2026-61355-0](https://patchblox.com/security/data/fix/linux/elsa-2026-61355-0.md) | Sep 1, 2026 |
| Linux | dbus-broker rocky 10 | 0:36-5.el10_2 | [RLSA-2026:61340](https://patchblox.com/security/data/fix/linux/rlsa-2026-61340.md) | Sep 1, 2026 |
| Linux | dbus-broker rocky 9 | 0:28-9.el9_8 | [RLSA-2026:61355](https://patchblox.com/security/data/fix/linux/rlsa-2026-61355.md) | Sep 1, 2026 |

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Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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