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

Quick assessment

Affected
Red Hat Red Hat Enterprise Linux 10
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Red Hat dbus-broker是美国Red Hat公司开源的一款专为 Linux 系统设计的高性能 D-Bus 消息代理。 Red Hat dbus-broker存在异常处理不当漏洞，该漏洞源于异常处理不当，当进程文件描述符限制达到时，对等体设置（特别是SO_PEERPIDFD）期间出现的EMFILE/ENFILE错误被视为致命错误，导致客户端退出，本地攻击者可通过打开多个到用户会话总线的连接触发此问题，拒绝服务到桌面会话。

CVSS 5.5 · Medium EPSS 0.11% · P1

Affected Version Matrix 9

VendorProduct Version RangeStatus
Red Hat Red Hat Enterprise Linux 10 0:36-5.el10_2< * unaffected
Red Hat Red Hat Enterprise Linux 9 0:28-9.el9_8< * unaffected
Red Hat Red Hat Hardened Images any affected
Red Hat Red Hat OpenShift Container Platform 4 any affected
Red Hat Red Hat Update Infrastructure 5 1788880445< * unaffected
1788880464< * unaffected
1788880456< * unaffected
1788765051< * unaffected
1788880581< * unaffected
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I. Basic Information for CVE-2026-16730

Vulnerability Information
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Vulnerability Title
Dbus-broker: dbus-broker: session bus denial of service via emfile during peer setup
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对异常条件的处理不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Red Hat dbus-broker 异常处理不当漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Red Hat dbus-broker是美国Red Hat公司开源的一款专为 Linux 系统设计的高性能 D-Bus 消息代理。 Red Hat dbus-broker存在异常处理不当漏洞，该漏洞源于异常处理不当，当进程文件描述符限制达到时，对等体设置（特别是SO_PEERPIDFD）期间出现的EMFILE/ENFILE错误被视为致命错误，导致客户端退出，本地攻击者可通过打开多个到用户会话总线的连接触发此问题，拒绝服务到桌面会话。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat Enterprise Linux 10 0:36-5.el10_2 ~ * cpe:/o:redhat:enterprise_linux:10.2
Red Hat Red Hat Enterprise Linux 9 0:28-9.el9_8 ~ * cpe:/o:redhat:enterprise_linux:9::baseos
Red Hat Red Hat Update Infrastructure 5 1788880445 ~ * cpe:/a:redhat:rhui:5::el9
Red Hat Red Hat Update Infrastructure 5 1788880464 ~ * cpe:/a:redhat:rhui:5::el9
Red Hat Red Hat Update Infrastructure 5 1788880456 ~ * cpe:/a:redhat:rhui:5::el9
Red Hat Red Hat Update Infrastructure 5 1788765051 ~ * cpe:/a:redhat:rhui:5::el9
Red Hat Red Hat Update Infrastructure 5 1788880581 ~ * cpe:/a:redhat:rhui:5::el9
Red Hat Red Hat Hardened Images - cpe:/a:redhat:hummingbird:1
Red Hat Red Hat OpenShift Container Platform 4 - cpe:/a:redhat:openshift:4

II. Public POCs for CVE-2026-16730

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III. Intelligence Information for CVE-2026-16730

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Vendor Advisories for CVE-2026-16730 (5)

Other References for CVE-2026-16730 (1)

Same Patch Batch · Red Hat · 2026-07-24 · 10 CVEs total

CVE-2026-17107 8.5 HIGH Cluster-proxy: impersonation-header injection grants cluster-admin on every managed cluste
CVE-2026-66337 6.5 MEDIUM Libsoup: libsoup: heap buffer over-read via integer underflow in soup_filter_input_stream_
CVE-2026-66339 6.5 MEDIUM Libsoup: libsoup: proxy credentials leak to destination server via proxy-authorization hea
CVE-2026-17059 6.5 MEDIUM Keycloak-services: keycloak-services: information disclosure via role-users endpoint bypas
CVE-2026-17048 5.5 MEDIUM Keycloak-services: keycloak-services: vault-resolved rotated client secrets leaked via adm
CVE-2026-16743 5.5 MEDIUM Accountsservice: accountsservice: arbitrary file read via seticonfile for systemd-homed us
CVE-2026-16910 5.5 MEDIUM Quay: ssrf in red hat quay notification webhooks (slack/generic)
CVE-2026-66338 5.4 MEDIUM Libsoup: libsoup: http request smuggling via permissive chunk-size parsing in soup_body_in
CVE-2026-17039 3.1 LOW Pki-core: dogtag-pki: redhat-pki: pki-core: ca renewal request processing omits realm auth

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 10
Same vendor: Red Hat
Same weakness: CWE-755

V. Comments for CVE-2026-16730

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