Red Hat Enterprise Linux (GNU coreutils unexpand): Schwachstelle ermöglicht DoS und Manipulation von Dateien
WID-SEC-2026-3319 · first 11.09.2026 · updated 29.10.2026 · CVSS 4,4
What it is about
Red Hat Enterprise Linux (RHEL) ist eine populäre Linux-Distribution. Ein lokaler Angreifer kann eine Schwachstelle in Red Hat Enterprise Linux ausnutzen, um einen Denial of Service Angriff durchzuführen oder möglicherweise den Speicher zu manipulieren.
Under what conditions?
Only with access to the device or an account on it. Often the second step after a phishing email.
What can happen in the worst case
An attacker could use the vulnerability to
- einen Denial of Service Angriff durchzuführen oder möglicherweise den Speicher zu manipulieren
Am I affected?
Affected according to the BSI:
- Red Hat Enterprise Linux
- RESF Rocky Linux
- Oracle Linux
- Red Hat Enterprise Linux 9
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-2026:66403 vom 2026-09-10 access.redhat.com
- Oracle Linux Security Advisory ELSA-2026-66403 vom 2026-09-11 linux.oracle.com
- Rocky Linux Security Advisory RLSA-2026:66403 vom 2026-09-11 errata.build.resf.org
- Red Hat Security Advisory RHSA-2026:67886 vom 2026-09-16 access.redhat.com
- Red Hat Security Advisory RHSA-2026:68276 vom 2026-09-16 access.redhat.com
- Oracle Linux Security Advisory ELSA-2026-67886 vom 2026-09-16 linux.oracle.com
- Rocky Linux Security Advisory RLSA-2026:67886 vom 2026-09-17 errata.build.resf.org
- Red Hat Security Advisory RHSA-2026:79357 vom 2026-10-08 access.redhat.com
- Red Hat Security Advisory RHSA-2026:81201 vom 2026-10-12 access.redhat.com
- Red Hat Security Advisory RHSA-2026:91001 vom 2026-10-27 access.redhat.com
CVE: CVE-2026-56392
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.