Linux Kernel (xfrm: iptfs): Schwachstelle ermöglicht DoS und Manipulation von Daten
WID-SEC-2026-2286 · first 13.07.2026 · updated 29.09.2026 · CVSS 6,1
What it is about
Der Kernel stellt den Kern des Linux Betriebssystems dar. Ein lokaler Angreifer kann eine Schwachstelle in Linux Kernel ausnutzen, um möglicherweise einen Denial-of-Service-Zustand auszulösen oder Daten 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
- möglicherweise einen Denial-of-Service-Zustand auszulösen oder Daten zu manipulieren
Am I affected?
Affected according to the BSI:
- Ubuntu Linux
- Open Source Linux Kernel <6.18.36
- Open Source Linux Kernel <7.0.13
- Open Source Linux Kernel <7.1
The installed version is usually shown under “Help → About” or in the device’s admin interface.
What helps?
Update to at least:
- Open Source Linux Kernel 6.18.36
- Open Source Linux Kernel 7.0.13
- Open Source Linux Kernel 7.1
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)
- Linux Kernel CVE Announcement vom 2026-07-12 lore.kernel.org
- Ubuntu Security Notice USN-8728-1 vom 2026-09-07 ubuntu.com
- Ubuntu Security Notice USN-8727-1 vom 2026-09-07 ubuntu.com
- Ubuntu Security Notice USN-8726-1 vom 2026-09-07 ubuntu.com
- Ubuntu Security Notice USN-8760-1 vom 2026-09-15 ubuntu.com
- Ubuntu Security Notice USN-8726-2 vom 2026-09-18 ubuntu.com
- Ubuntu Security Notice USN-8726-3 vom 2026-09-21 ubuntu.com
- Ubuntu Security Notice USN-8800-1 vom 2026-09-22 ubuntu.com
- Ubuntu Security Notice USN-8726-4 vom 2026-09-22 ubuntu.com
- Ubuntu Security Notice USN-8728-2 vom 2026-09-22 ubuntu.com
- Ubuntu Security Notice USN-8760-2 vom 2026-09-22 ubuntu.com
- Ubuntu Security Notice USN-8728-3 vom 2026-09-29 ubuntu.com
CVE: CVE-2026-53363
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.