GHSA-m8mc-q4p7-p8j3: RIOT: Out-of-Bounds Read in RIOT OS 6LoWPAN SFF Fragment Handling

RIOT is an open-source microcontroller operating system designed for Internet of Things devices and other embedded systems. In 2026.07 and earlier, receive() in sys/net/gnrc/networklayer/sixlowpan/gnrcsixlowpan.c can route an undersized packet into SFF fragment handling after only a minimal payload check. The code then interprets the packet as a sixlowpanfragt or larger fragment header without verifying that the packet snip contains the required bytes. A remote attacker can send a malformed 6LoWPAN fragment that causes gnrcsixlowpanfragrecv() to read beyond the packet buffer, potentially disclosing memory and crashing the network stack. No fixed repository release is available as of this review.