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NVD / CVE Program· CNA redhat

CVE-2026-16730: Dbus-broker: dbus-broker: session bus denial of service via emfile during peer setup

Noroxi assessment

Priority: Monitor (action score 22/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.15% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: dbus-broker (AlmaLinux:10) 36-5.el10_2; dbus-broker (AlmaLinux:9) 28-9.el9_8; dbus-broker (Red Hat:enterprise_linux:10.2) 0:36-5.el10_2.

Low priority for now. Upgrade to dbus-broker (AlmaLinux:10) 36-5.el10_2; dbus-broker (AlmaLinux:9) 28-9.el9_8; dbus-broker (Red Hat:enterprise_linux:10.2) 0:36-5.el10_2 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Jul 24, 2026
Updated
Nov 5, 2026
EPSS
0.1% · 4th percentile

Report tools

JSON

Action score

22

Monitor

Low priority for now.

CVSS
22 / 40 · 5.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · redhat
5.5
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-16730

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.

  • Red Hat Red Hat Enterprise Linux 10

    • 0:36-5.el10_2 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 9

    • 0:28-9.el9_8 and laternot affected · rpm

  • Red Hat Red Hat Hardened Images

    • all versionsaffected

  • Red Hat Red Hat OpenShift Container Platform 4

    • all versionsaffected

  • Red Hat Red Hat OpenShift Container Platform 5

    • all versionsaffected

  • Red Hat Red Hat Update Infrastructure 5

    • 1788880445 and laternot affected · rpm
    • 1788880464 and laternot affected · rpm
    • 1788880456 and laternot affected · rpm
    • 1788765051 and laternot affected · rpm
    • 1788880581 and laternot affected · rpm

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:10dbus-brokerbefore 36-5.el10_236-5.el10_2
AlmaLinux:9dbus-brokerbefore 28-9.el9_828-9.el9_8
Debian:12dbus-brokerfrom 0—
Red Hat:enterprise_linux:10.2dbus-brokerbefore 0:36-5.el10_20:36-5.el10_2
Red Hat:enterprise_linux:10.2dbus-broker-debuginfobefore 0:36-5.el10_20:36-5.el10_2
Red Hat:enterprise_linux:10.2dbus-broker-debugsourcebefore 0:36-5.el10_20:36-5.el10_2
Red Hat:enterprise_linux:9::baseosdbus-brokerbefore 0:28-9.el9_80:28-9.el9_8
Red Hat:enterprise_linux:9::baseosdbus-broker-debuginfobefore 0:28-9.el9_80:28-9.el9_8
Red Hat:enterprise_linux:9::baseosdbus-broker-debugsourcebefore 0:28-9.el9_80:28-9.el9_8
Rocky Linux:10dbus-brokerbefore 0:36-5.el10_20:36-5.el10_2
Rocky Linux:9dbus-brokerbefore 0:28-9.el9_80:28-9.el9_8

Same product

red hat: all records

Other highest-scoring records for the same primary product.

  • CVE-2025-10230Samba: command injection in wins server hook script
    52Plan
  • CVE-2026-4631Cockpit: cockpit: unauthenticated remote code execution due to ssh command-line argument injection
    44Plan
  • CVE-2026-76578Ipa: freeipa: freeipa: unauthenticated ldap client can obtain administrator credentials via the self-managed-token aci
    39Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2026-64611Jul 23, 2026 · Libcupsfilters: cups-filters: libcupsfilters: cpu exhaustion via infinite loop in cfieee1284normalizemakemodel()
    30Monitor
  • ← EarlierCVE-2026-16743Jul 24, 2026 · Accountsservice: accountsservice: arbitrary file read via seticonfile for systemd-homed users
    22Monitor
  • Later →CVE-2026-17072Jul 28, 2026 · Gstreamer1-plugins-good: gst-plugins-good: 4-byte heap over-read in gst_matroska_parse_flac_stream_headers when parsing flac codec data in matroska containers
    13Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
almalinux:dbus-broker36-5.el10_2 · AlmaLinux:10Package registry (OSV)
red hat:dbus-broker0:36-5.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:dbus-broker-debuginfo0:36-5.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:dbus-broker-debugsource0:36-5.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
rocky linux:dbus-broker0:36-5.el10_2 · Rocky Linux:10Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-755 · Improper Handling of Exceptional Conditions

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (5 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records