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HighVulnerabilityupdated 26 Oct 2026, 12:34 UTC

Linux kernel: several flaws allow crashes and possibly root access

Attackers who can reach or run code on a Linux machine may crash it or, in some cases, gain full control. Updating the kernel closes these holes.

Official source
SeverityHighVulnerability
Being exploited?UnclearNo reports either way yet
Fix available?UnclearNo fixed version published in the sources yet
How sure is this?Official sourceBacked by an official source

What happened

Multiple vulnerabilities in the Linux kernel (including a Bluetooth component) allow denial-of-service and, in some reports, unspecified effects such as memory corruption or privilege escalation to root.

Why it is dangerous: Crashed servers and workstations cause downtime, and where root escalation is possible, a local user or attacker could take over the system; anyone running unpatched kernels is at risk.

Are you affected?

You are affected if you run a Linux system with an unpatched kernel, including the Bluetooth subsystem.

Linux kernel (affected versions not specified in the material).

What to do

  1. Check your current kernel version with 'uname -r'
  2. Install the latest kernel updates from your Linux distribution
  3. Reboot the system to load the patched kernel
  4. Check the CERT-Bund/BSI advisories for the exact fixed versions

Timeline

  1. 26 Oct 2026, 07:54 UTC
    Publicly disclosed
  2. 26 Oct 2026, 07:54 UTC
    Reported by CERT-Bund (BSI) · CERT-Bund (BSI)
  3. 26 Oct 2026, 07:56 UTC
    Reported by CERT-Bund (BSI) · CERT-Bund (BSI)
  4. 26 Oct 2026, 07:57 UTC
    Picked up by Zero Radar
  5. 26 Oct 2026, 11:44 UTC
    Reported by CERT-Bund (BSI) · CERT-Bund (BSI)
  6. 26 Oct 2026, 11:44 UTC
    Reported by CERT-Bund (BSI) · CERT-Bund (BSI)
  7. 26 Oct 2026, 11:44 UTC
    Reported by CERT-Bund (BSI) · CERT-Bund (BSI)
  8. 26 Oct 2026, 11:44 UTC
    Reported by CERT-Bund (BSI) · CERT-Bund (BSI)
  9. 26 Oct 2026, 11:45 UTC
    Reported by CERT-Bund (BSI) · CERT-Bund (BSI)
  10. 26 Oct 2026, 11:45 UTC
    Reported by CERT-Bund (BSI) · CERT-Bund (BSI)
  11. 26 Oct 2026, 12:30 UTC
    Reported by CERT-Bund (BSI) · CERT-Bund (BSI)
  12. 26 Oct 2026, 12:30 UTC
    Reported by CERT-Bund (BSI) · CERT-Bund (BSI)
  13. 26 Oct 2026, 12:30 UTC
    Reported by CERT-Bund (BSI) · CERT-Bund (BSI)

Sources 11 reports, oldest first

Official vendor, government CERT or advisory database

Technical details

ID
ZR-514e6f03
Disclosed
26 Oct 2026, 07:54 UTC
On Zero Radar
26 Oct 2026, 07:57 UTC (3 min after disclosure)
Last change
26 Oct 2026, 12:34 UTC

The plain-language parts and the attack diagram were written by an AI model (anthropic/claude-haiku-5.5) from the sources above. Facts like versions, exploitation and dates come from the sources themselves. How Zero Radar works

Linux kernel: several flaws allow crashes and possibly root access · Zero Radar