Medium severity · published Jul 24, 2026
CVE-2026-16730
Dbus-broker: dbus-broker: session bus denial of service via emfile during peer setup
5.5
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 4% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
RH
Red Hat Enterprise Linux 10 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat Enterprise Linux 9 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat Hardened Images · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat OpenShift Container Platform 4 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat Update Infrastructure 5 · Red Hat
All versions, or not specified · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-16730
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-16730
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:61340
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:61355
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:66018
access.redhat.com
https://access.redhat.com/security/cve/CVE-2026-16730
bugzilla.redhat.com
https://bugzilla.redhat.com/show_bug.cgi?id=2506348
github.com
https://github.com/bus1/dbus-broker/issues/435
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