Critical

BPFdoor hides deep inside the OS kernel to target telecoms worldwide

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March 26, 2026 at 6:49 PM

Actively Exploited

Overview

A backdoor known as BPFdoor, linked to Chinese cyber actors, has been discovered operating within the Linux kernel of key telecom servers and Kubernetes pods. First identified in 2021, this backdoor is now posing a significant risk to global telecommunications infrastructure. Researchers found that BPFdoor's stealthy design allows it to evade detection while compromising critical systems. This situation is concerning as it impacts the reliability and security of telecom services worldwide, potentially allowing attackers to intercept communications or disrupt services. Companies in the telecom sector need to be vigilant and take immediate action to secure their systems against this threat.

Key Takeaways

Active Exploitation: This vulnerability is being actively exploited by attackers. Immediate action is recommended.
Affected Systems: Linux kernel in telecom servers, Kubernetes pods
Action Required: Companies should review their security protocols, apply the latest kernel patches, and monitor for unusual activity within their systems.
Timeline: Ongoing since 2021

Original Article Summary

China-linked Linux backdoor first spotted in 2021, but now runs inside the kernel of core telecom servers and Kubernetes pods.

Impact

Linux kernel in telecom servers, Kubernetes pods

Exploitation Status

This vulnerability is confirmed to be actively exploited by attackers in real-world attacks. Organizations should prioritize patching or implementing workarounds immediately.

Timeline

Ongoing since 2021

Remediation

Companies should review their security protocols, apply the latest kernel patches, and monitor for unusual activity within their systems.

Additional Information

This threat intelligence is aggregated from trusted cybersecurity sources. For the most up-to-date information, technical details, and official vendor guidance, please refer to the original article linked below.

Related Topics: This incident relates to Linux, Critical.

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