Red Hat Enterprise Linux (mod_auth_openidc): Schwachstelle ermöglicht Denial of Service
WID-SEC-2026-3492 · first 22.09.2026 · updated 13.10.2026 · CVSS 7,5
What it is about
Red Hat Enterprise Linux (RHEL) ist eine populäre Linux-Distribution. Ein entfernter, anonymer Angreifer kann eine Schwachstelle in Red Hat Enterprise Linux ausnutzen, um einen Denial of Service Angriff durchzuführen.
Under what conditions?
Over the network and without logging in. This is the most dangerous combination: attackers can scan reachable devices automatically.
What can happen in the worst case
An attacker could use the vulnerability to
- einen Denial of Service Angriff durchzuführen
Am I affected?
Affected according to the BSI:
- Red Hat Enterprise Linux
- RESF Rocky Linux
- Oracle Linux
- Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
- Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On
- Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
- Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On
- Red Hat Enterprise Linux 7 Extended Lifecycle Support
- Red Hat Enterprise Linux 9.6 Extended Update Support
- Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
- Red Hat Enterprise Linux 8.8 Telecommunications Update Service
- Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions
and 2 more
The installed version is usually shown under “Help → About” or in the device’s admin interface.
What helps?
Install the updates provided by the vendor; details in the sources below.
Is the vulnerability already being exploited?
None of the CVEs is in the CISA catalogue of exploited vulnerabilities. That does not mean there are no attacks, only that none are documented.
Information and sources
- Original BSI advisory (WID)
- Red Hat Security Advisory RHSA-2026:69712 vom 2026-09-21 access.redhat.com
- Red Hat Security Advisory RHSA-2026:69713 vom 2026-09-21 access.redhat.com
- Red Hat Security Advisory RHSA-2026:69715 vom 2026-09-21 access.redhat.com
- Red Hat Security Advisory RHSA-2026:69716 vom 2026-09-21 access.redhat.com
- Red Hat Security Advisory RHSA-2026:69717 vom 2026-09-21 access.redhat.com
- Red Hat Security Advisory RHSA-2026:69718 vom 2026-09-21 access.redhat.com
- Red Hat Security Advisory RHSA-2026:69719 vom 2026-09-21 access.redhat.com
- Red Hat Security Advisory RHSA-2026:69720 vom 2026-09-21 access.redhat.com
- Red Hat Security Advisory RHSA-2026:75581 vom 2026-10-05 access.redhat.com
- Oracle Linux Security Advisory ELSA-2026-75581 vom 2026-10-05 oss.oracle.com
- Rocky Linux Security Advisory RLSA-2026:75581 vom 2026-10-06 errata.build.resf.org
- Rocky Linux Security Advisory RLSA-2026:77369 vom 2026-10-08 errata.build.resf.org
- Red Hat Security Advisory RHSA-2026:77369 vom 2026-10-07 access.redhat.com
- Red Hat Security Advisory RHSA-2026:79177 vom 2026-10-08 access.redhat.com
- Rocky Linux Security Advisory RLSA-2026:79177 vom 2026-10-09 errata.build.resf.org
- Oracle Linux Security Advisory ELSA-2026-69715 vom 2026-10-10 linux.oracle.com
- Oracle Linux Security Advisory ELSA-2026-79177 vom 2026-10-12 linux.oracle.com
- Oracle Linux Security Advisory ELSA-2026-77369 vom 2026-10-13 linux.oracle.com
CVE: CVE-2026-54789
Source: BSI warning and information service (CERT-Bund); CISA. The assessment of the conditions is my reading of the BSI text; the external pages are in their original language.