Samba: Schwachstelle ermöglicht Denial of Service
WID-SEC-2026-1508 · first 13.05.2026 · updated 17.07.2026 · CVSS 7,5
What it is about
Samba ist eine Open Source Software Suite, die Druck- und Dateidienste für SMB/CIFS Clients implementiert. Ein entfernter, anonymer Angreifer kann eine Schwachstelle in Samba 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
- Oracle Linux
- SUSE openSUSE
- RESF Rocky Linux
- Open Source Samba <4.24.2
The installed version is usually shown under “Help → About” or in the device’s admin interface.
What helps?
Update to at least:
- Open Source Samba 4.24.2
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)
- Samba Release Notes vom 2026-05-12 www.samba.org
- Red Hat Security Advisory RHSA-2026:22963 vom 2026-06-03 access.redhat.com
- Red Hat Security Advisory RHSA-2026:25049 vom 2026-06-10 access.redhat.com
- Rocky Linux Security Advisory RLSA-2026:22963 vom 2026-06-11 errata.build.resf.org
- Rocky Linux Security Advisory RLSA-2026:25049 vom 2026-06-13 errata.build.resf.org
- Oracle Linux Security Advisory ELSA-2026-25049 vom 2026-06-25 linux.oracle.com
- openSUSE Security Update OPENSUSE-SU-2026:11121-1 vom 2026-06-27 lists.opensuse.org
- Oracle Linux Security Advisory ELSA-2026-22963 vom 2026-07-17 linux.oracle.com
CVE: CVE-2026-40170
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.