Key Derivation Flaw in Zephyr IPv6 Stack Affects IoT Devices

CVE-2026-19742

What is CVE-2026-19742?

The vulnerability in the Zephyr OS IPv6 stack arises from the insecure generation of long-lived secret keys for stable and temporary interface identifiers. Utilizing an API that lacks cryptographic security, the system's randomness relies on potentially predictable sources. These generated identifiers can be exploited by attackers to track devices across networks and predict their addresses, undermining the privacy and security models designed to protect them. An updated patch now ensures that keys are generated using a secure cryptographic method and aborts processes when randomness cannot be assured, fostering better security practices.

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