OpenSSH GSSAPI delta: Schwachstelle ermöglicht nicht spezifizierten Angriff
WID-SEC-2026-0716 · first 13.03.2026 · updated 01.09.2026 · CVSS 6,5
What it is about
OpenSSH ist eine Open Source Implementierung des Secure Shell Protokolls. Ubuntu Linux ist die Linux Distribution des Herstellers Canonical. Ein entfernter, anonymer Angreifer kann eine Schwachstelle in OpenSSH GSSAPI und Ubuntu Linux ausnutzen, um ein undefiniertes Fehlverhalten oder einen potenziellen Denial-of-Service-Angriff auszulösen.
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
- ein undefiniertes Fehlverhalten oder einen potenziellen Denial-of-Service-Angriff auszulösen
Am I affected?
Affected according to the BSI:
- Debian Linux
- IBM Power Hardware Management Console
- Red Hat Enterprise Linux
- Fedora Linux
- SUSE Linux
- Oracle Linux
- SUSE openSUSE
- RESF Rocky Linux
- Open Source OpenSSH GSSAPI delta Linux distributions
- Ubuntu Linux
- IBM QRadar SIEM <7.5.0 UP15 IF02
- Siemens SIMATIC S7 1500 CPU
and 6 more
The installed version is usually shown under “Help → About” or in the device’s admin interface.
What helps?
Update to at least:
- IBM QRadar SIEM 7.5.0 UP15 IF02
- Red Hat OpenShift Container Platform 4.15.64
- Red Hat OpenShift Container Platform 4.17.54
- Red Hat OpenShift Container Platform 4.19.32
- Red Hat OpenShift Container Platform 4.13.67
- Red Hat OpenShift Container Platform 4.12.91
- Dell Secure Connect Gateway 5.36.00.16
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)
- GitHub Security Advisory GHSA-WCPP-3X59-H8VP vom 2026-03-12 github.com
- Mailing List OSS-Security vom 2026-03-12 seclists.org
- Ubuntu Security Notice USN-8090-1 vom 2026-03-12 ubuntu.com
- Ubuntu Security Notice USN-8090-2 vom 2026-03-12 ubuntu.com
- Fedora Security Advisory FEDORA-2026-BAB4AA5DA7 vom 2026-03-18 bodhi.fedoraproject.org
- Fedora Security Advisory FEDORA-2026-39819A3D62 vom 2026-03-18 bodhi.fedoraproject.org
- Fedora Security Advisory FEDORA-2026-62FB46CAAC vom 2026-03-18 bodhi.fedoraproject.org
- Oracle Linux Security Advisory ELSA-2026-6462 vom 2026-04-03 linux.oracle.com
- Oracle Linux Security Advisory ELSA-2026-6461 vom 2026-04-03 linux.oracle.com
- Oracle Linux Security Advisory ELSA-2026-6463 vom 2026-04-02 linux.oracle.com
- Red Hat Security Advisory RHSA-2026:6463 vom 2026-04-02 access.redhat.com
- Red Hat Security Advisory RHSA-2026:6462 vom 2026-04-02 access.redhat.com
- Red Hat Security Advisory RHSA-2026:6461 vom 2026-04-02 access.redhat.com
- Rocky Linux Security Advisory RLSA-2026:6461 vom 2026-04-09 errata.build.resf.org
- Red Hat Security Advisory RHSA-2026:7107 vom 2026-04-08 access.redhat.com
- Debian Security Advisory DSA-6204 vom 2026-04-09 lists.debian.org
- Debian Security Advisory DLA-4535 vom 2026-04-16 lists.debian.org
- Red Hat Security Advisory RHSA-2026:9415 vom 2026-04-21 access.redhat.com
- Red Hat Security Advisory RHSA-2026:10065 vom 2026-04-23 access.redhat.com
- Red Hat Security Advisory RHSA-2026:9732 vom 2026-04-22 access.redhat.com
- IBM Security Bulletin 7270594 vom 2026-04-23 www.ibm.com
- Red Hat Security Advisory RHSA-2026:10714 vom 2026-04-27 access.redhat.com
- Red Hat Security Advisory RHSA-2026:13812 vom 2026-05-05 access.redhat.com
- Red Hat Security Advisory RHSA-2026:13750 vom 2026-05-05 access.redhat.com
- Red Hat Security Advisory RHSA-2026:14924 vom 2026-05-07 access.redhat.com
and 26 more sources in the original advisory
CVE: CVE-2026-3497
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.