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Root Exploit for Linux Kernel Flaws Disclosed

Root Exploit for Linux Kernel Flaws Disclosed

First seen 26 Oct 2026, 14:41 UTC • •
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ThreatCluster AI
ThreatCluster •October 26, 2026 at 15:12 UTC
  • •Six critical Linux vulnerabilities disclosed, two rated CVSS 9.0.
  • •Proof of concept for ZDI-CAN-33367 allows root access on major Linux distributions.
  • •No CVE IDs assigned yet; organizations should implement mitigations immediately.

On October 20, 2026, Trend Micro's Zero Day Initiative (ZDI) disclosed a bug in the ConnMan network manager, along with five other Linux vulnerabilities. None of these vulnerabilities have been assigned CVE IDs yet, and no in-the-wild exploitation has been reported. Two of the flaws have a CVSS score of 9.0, indicating high severity. A proof of concept (PoC) for ZDI-CAN-33367 has been released, allowing root access on Ubuntu, Debian, and AlmaLinux systems. Security teams are advised to implement detections and mitigations while waiting for patches. The vulnerabilities affect various systems, with exposure risk varying significantly across the reports. A small patch for a related issue has been reviewed but not merged yet. Organizations should assess their inventory to prioritize responses to these vulnerabilities.

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Timeline

2026-05-08
CVE-2026-43284 published
Vulnerability assigned a CVE identifier and published in the National Vulnerability Database.
MITRE
2026-07-10
CVE-2026-53363 published
Vulnerability assigned a CVE identifier and published in the National Vulnerability Database.
MITRE
2026-09-16
CVE-2026-90049 published
Vulnerability assigned a CVE identifier and published in the National Vulnerability Database.
MITRE
2026-10-20
ZDI discloses Linux vulnerabilities
Trend Micro's ZDI reported a bug in ConnMan and five other Linux flaws, with no CVEs assigned yet.
Sysdig
2026-10-21
ZDI sends reports to Linux kernel team
ZDI sent five reports to the Linux kernel security team, including reproduction details for each vulnerability.
Sysdig
2026-10-24
Sysdig publishes analysis of vulnerabilities
Sysdig's Threat Research Team reviewed the vulnerabilities, advising organizations to prepare mitigations.
Sysdig

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Common questions

What distributions are affected?
The vulnerabilities affect current versions of Ubuntu, Debian, and AlmaLinux.
What should organizations do now?
Organizations should implement detections and mitigations while waiting for patches.
Is there a patch available?
A small patch related to these vulnerabilities has been reviewed but not yet merged.