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CriticalVulnerabilityupdated 29 Oct 2026, 14:04 UTC

Linux kernel: several vulnerabilities, attacker could crash or take control of systems

Many separate security flaws in the Linux operating system kernel (the core of the system) were found. Depending on the flaw, an attacker could crash a machine, read private data, or gain higher privileges.

Official source
SeverityCriticalVulnerability
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 allow local or remote attackers to escalate privileges, cause denial of service, bypass security mechanisms, disclose or manipulate data, and possibly execute code.

Why it is dangerous: Successful exploitation could let an attacker take full control of a server or workstation, access confidential information, or take services offline. Systems running affected kernel versions are at risk.

Are you affected?

You are affected if you run a Linux kernel version listed in the affected versions below, on a server, workstation or device.

What to do

  1. Identify all Linux systems and their kernel versions
  2. Check the CERT-Bund (BSI) advisories and your distribution's security notices for the patched kernel version
  3. Install the updated kernel and reboot the affected systems
  4. Restrict local user access on systems that cannot be patched immediately

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, 07:57 UTC
    Picked up by Zero Radar
  4. 26 Oct 2026, 12:29 UTC
    Reported by CERT-Bund (BSI) · CERT-Bund (BSI)
  5. 26 Oct 2026, 12:29 UTC
    Reported by CERT-Bund (BSI) · CERT-Bund (BSI)
  6. 26 Oct 2026, 12:29 UTC
    Reported by CERT-Bund (BSI) · CERT-Bund (BSI)
  7. 26 Oct 2026, 12:30 UTC
    Reported by CERT-Bund (BSI) · CERT-Bund (BSI)
  8. 26 Oct 2026, 12:30 UTC
    Reported by CERT-Bund (BSI) · CERT-Bund (BSI)
  9. 26 Oct 2026, 12:30 UTC
    Reported by CERT-Bund (BSI) · CERT-Bund (BSI)
  10. 26 Oct 2026, 12:30 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)
  14. 26 Oct 2026, 12:31 UTC
    Reported by CERT-Bund (BSI) · CERT-Bund (BSI)
  15. 26 Oct 2026, 12:31 UTC
    Reported by CERT-Bund (BSI) · CERT-Bund (BSI)
  16. 26 Oct 2026, 12:31 UTC
    Reported by CERT-Bund (BSI) · CERT-Bund (BSI)
  17. 26 Oct 2026, 12:31 UTC
    Reported by CERT-Bund (BSI) · CERT-Bund (BSI)
  18. 27 Oct 2026, 12:16 UTC
    Reported by CERT-Bund (BSI) · CERT-Bund (BSI)
  19. 27 Oct 2026, 12:17 UTC
    Reported by CERT-Bund (BSI) · CERT-Bund (BSI)
  20. 27 Oct 2026, 12:17 UTC
    Reported by CERT-Bund (BSI) · CERT-Bund (BSI)
  21. 27 Oct 2026, 12:41 UTC
    Reported by CERT-Bund (BSI) · CERT-Bund (BSI)
  22. 27 Oct 2026, 12:41 UTC
    Reported by CERT-Bund (BSI) · CERT-Bund (BSI)
  23. 27 Oct 2026, 12:43 UTC
    Severity raised to critical
  24. 27 Oct 2026, 12:51 UTC
    Reported by CERT-Bund (BSI) · CERT-Bund (BSI)
  25. 29 Oct 2026, 04:15 UTC
    Severity raised to critical
  26. 29 Oct 2026, 09:08 UTC
    Reported by CERT-Bund (BSI) · CERT-Bund (BSI)
  27. 29 Oct 2026, 09:49 UTC
    Reported by CERT-Bund (BSI) · CERT-Bund (BSI)
  28. 29 Oct 2026, 12:55 UTC
    Reported by CERT-Bund (BSI) · CERT-Bund (BSI)
  29. 29 Oct 2026, 12:55 UTC
    Reported by CERT-Bund (BSI) · CERT-Bund (BSI)
  30. 29 Oct 2026, 12:55 UTC
    Reported by CERT-Bund (BSI) · CERT-Bund (BSI)
  31. 29 Oct 2026, 13:59 UTC
    Reported by CERT-Bund (BSI) · CERT-Bund (BSI)

Sources 27 reports, oldest first

Official vendor, government CERT or advisory database

Technical details

ID
ZR-cf24346d · ZR-5943318b · ZR-5ab3b943
Disclosed
26 Oct 2026, 07:54 UTC
On Zero Radar
26 Oct 2026, 07:57 UTC (2 min after disclosure)
Last change
29 Oct 2026, 14:04 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 vulnerabilities, attacker could crash or take control of systems · Zero Radar