Local Denial of Service Vulnerability in Dbus-broker by Red Hat
CVE-2026-16730

5.5MEDIUM

Key Information:

Vendor

Red Hat
Status
Red Hat Enterprise Linux 10
Red Hat Enterprise Linux 9
Red Hat Hardened Images
Red Hat Openshift Container Platform 4
Vendor
CVE Published:
24 July 2026

What is CVE-2026-16730?

A vulnerability in dbus-broker allows a local attacker to exploit the process file-descriptor limit. When this limit is reached, any errors during peer setup, such as EMFILE or ENFILE, can cause the broker to terminate unexpectedly. This results in a denial of service for the desktop session, particularly impacting users who rely on Flatpak applications that connect to the session bus via the dbus proxy.

References

https://access.redhat.com/security/cve/CVE-2026-16730
vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2506348
issue-trackingx_refsource_REDHAT
https://github.com/bus1/dbus-broker/issues/435

CVSS V3.1

Score:
5.5
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Red Hat would like to thank Josh Simmons for reporting this issue.
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