Linux Kernel (Bluetooth): Mehrere Schwachstellen ermöglichen Denial of Service
WID-SEC-2026-1684 · first 27.05.2026 · updated 26.10.2026 · CVSS 5,5
What it is about
Der Kernel stellt den Kern des Linux Betriebssystems dar. Ein lokaler Angreifer kann mehrere Schwachstellen im Linux Kernel bezüglich der Bluetooth Komponente ausnutzen, um einen Denial of Service Angriff durchzuführen.
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
Am I affected?
Affected according to the BSI:
- Debian Linux
- SUSE Linux
- SUSE openSUSE
- Open Source Linux Kernel <7.0.7
- Open Source Linux Kernel <7.1-rc3
- Open Source Linux Kernel <6.6.140
- Open Source Linux Kernel <6.12.90
- Open Source Linux Kernel <6.18.30
- Ubuntu Linux
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 7.0.7
- Open Source Linux Kernel 7.1-rc3
- Open Source Linux Kernel 6.6.140
- Open Source Linux Kernel 6.12.90
- Open Source Linux Kernel 6.18.30
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)
- Kernel CVE Announce Mailingliste lore.kernel.org
- Linux Kernel CVE Announcement CVE-2026-45834 lore.kernel.org
- Linux Kernel CVE Announcement CVE-2026-45835 lore.kernel.org
- Linux Kernel CVE Announcement CVE-2026-45836 lore.kernel.org
- openSUSE Security Update OPENSUSE-SU-2026:10954-1 vom 2026-06-08 lists.opensuse.org
- SUSE Security Update SUSE-SU-2026:2450-1 vom 2026-06-18 lists.suse.com
- Debian Security Advisory DLA-4665 vom 2026-07-03 lists.debian.org
- Debian Security Advisory DLA-4671 vom 2026-07-05 lists.debian.org
- Debian Security Advisory DLA-4664 vom 2026-07-03 lists.debian.org
- SUSE Security Update SUSE-SU-2026:3130-1 vom 2026-07-20 lists.suse.com
- Ubuntu Security Notice USN-8569-1 vom 2026-07-20 ubuntu.com
- Ubuntu Security Notice USN-8568-1 vom 2026-07-20 ubuntu.com
- Ubuntu Security Notice USN-8567-1 vom 2026-07-20 ubuntu.com
- Ubuntu Security Notice USN-8566-1 vom 2026-07-20 ubuntu.com
- Ubuntu Security Notice USN-8574-1 vom 2026-07-21 ubuntu.com
- Ubuntu Security Notice USN-8575-1 vom 2026-07-21 ubuntu.com
- Ubuntu Security Notice USN-8576-1 vom 2026-07-21 ubuntu.com
- SUSE Security Update SUSE-SU-2026:3166-1 vom 2026-07-22 lists.suse.com
- Ubuntu Security Notice USN-8595-1 vom 2026-07-23 ubuntu.com
- Ubuntu Security Notice USN-8596-1 vom 2026-07-23 ubuntu.com
- Ubuntu Security Notice USN-8574-2 vom 2026-07-23 ubuntu.com
- Ubuntu Security Notice USN-8593-1 vom 2026-07-23 ubuntu.com
- Ubuntu Security Notice USN-8575-2 vom 2026-07-23 ubuntu.com
- Ubuntu Security Notice USN-8576-2 vom 2026-07-23 ubuntu.com
- Ubuntu Security Notice USN-8597-1 vom 2026-07-23 ubuntu.com
and 46 more sources in the original advisory
CVE: CVE-2026-45834, CVE-2026-45835, CVE-2026-45836
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.