Linux Kernel: Mehrere Schwachstellen ermöglichen Denial of Service
WID-SEC-2025-2040 · first 12.09.2025 · updated 29.10.2026 · CVSS 8,6
What it is about
Der Kernel stellt den Kern des Linux Betriebssystems dar. Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in Linux Kernel ausnutzen, um Sicherheitsmechanismen zu umgehen, sowie einen Denial of Service Angriff oder andere nicht spezifizierte Angriffe 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
- Sicherheitsmechanismen zu umgehen
- sowie einen Denial of Service Angriff oder andere nicht spezifizierte Angriffe durchzuführen
Am I affected?
Affected according to the BSI:
- Google Container-Optimized OS
- Dell NetWorker
- Debian Linux
- Google Cloud Platform
- IBM DataPower Gateway
- Amazon Linux 2
- Red Hat Enterprise Linux
- Fedora Linux
- Ubuntu Linux
- SUSE Linux
- Oracle Linux
- IBM QRadar SIEM
and 14 more
The installed version is usually shown under “Help → About” or in the device’s admin interface.
What helps?
Update to at least:
- Dell Secure Connect Gateway Appliance 5.32.00.18
- IBM QRadar SIEM 7.5.0 UP14 IF01
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)
- Ubuntu Security Notice USN-7933-1 vom 2025-12-15 ubuntu.com
- SUSE Security Update SUSE-SU-2025:4393-1 vom 2025-12-15 lists.suse.com
- Ubuntu Security Notice USN-7934-1 vom 2025-12-15 ubuntu.com
- Ubuntu Security Notice USN-7909-5 vom 2025-12-15 ubuntu.com
- Ubuntu Security Notice USN-7937-1 vom 2025-12-16 ubuntu.com
- Ubuntu Security Notice USN-7935-1 vom 2025-12-16 ubuntu.com
- Kernel CVE Announce Mailingliste lore.kernel.org
- Linux Kernel CVE Announcement CVE-2025-39736 lore.kernel.org
- Linux Kernel CVE Announcement CVE-2025-39737 lore.kernel.org
- Linux Kernel CVE Announcement CVE-2025-39738 lore.kernel.org
- Linux Kernel CVE Announcement CVE-2025-39739 lore.kernel.org
- Linux Kernel CVE Announcement CVE-2025-39740 lore.kernel.org
- Linux Kernel CVE Announcement CVE-2025-39741 lore.kernel.org
- Linux Kernel CVE Announcement CVE-2025-39742 lore.kernel.org
- Linux Kernel CVE Announcement CVE-2025-39743 lore.kernel.org
- Linux Kernel CVE Announcement CVE-2025-39744 lore.kernel.org
- Linux Kernel CVE Announcement CVE-2025-39745 lore.kernel.org
- Linux Kernel CVE Announcement CVE-2025-39746 lore.kernel.org
- Linux Kernel CVE Announcement CVE-2025-39747 lore.kernel.org
- Linux Kernel CVE Announcement CVE-2025-39748 lore.kernel.org
- Linux Kernel CVE Announcement CVE-2025-39749 lore.kernel.org
- Linux Kernel CVE Announcement CVE-2025-39750 lore.kernel.org
- Linux Kernel CVE Announcement CVE-2025-39751 lore.kernel.org
- Linux Kernel CVE Announcement CVE-2025-39752 lore.kernel.org
- Linux Kernel CVE Announcement CVE-2025-39753 lore.kernel.org
and 389 more sources in the original advisory
CVE: CVE-2025-39736, CVE-2025-39737, CVE-2025-39738, CVE-2025-39739, CVE-2025-39740, CVE-2025-39741, CVE-2025-39742, CVE-2025-39743, CVE-2025-39744, CVE-2025-39745, CVE-2025-39746, CVE-2025-39747, CVE-2025-39748, CVE-2025-39749, CVE-2025-39750, CVE-2025-39751, CVE-2025-39752, CVE-2025-39753, CVE-2025-39754, CVE-2025-39756 …
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.