RIOT-OS RIOT up to 2026.07 6LoWPAN Fragment gnrc_sixlowpan.c _receive out-of-bounds

Summaryinfo

A vulnerability was found in RIOT-OS RIOT up to 2026.07. It has been rated as critical. This affects the function _receive of the file sys/net/gnrc/network_layer/sixlowpan/gnrc_sixlowpan.c of the component 6LoWPAN Fragment Handler. Performing a manipulation results in out-of-bounds. This vulnerability is cataloged as CVE-2026-107837. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability classified as critical has been found in RIOT-OS RIOT up to 2026.07. This affects the function _receive of the file sys/net/gnrc/network_layer/sixlowpan/gnrc_sixlowpan.c of the component 6LoWPAN Fragment Handler. The manipulation with an unknown input leads to a out-of-bounds vulnerability. CWE is classifying the issue as CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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/network_layer/sixlowpan/gnrc_sixlowpan.c can route an undersized packet into SFF fragment handling after only a minimal payload check. The code then interprets the packet as a sixlowpan_frag_t 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 gnrc_sixlowpan_frag_recv() to read beyond the packet buffer, potentially disclosing memory and crashing the network stack. No fixed repository release is available as of this review.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-107837 since 10/09/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 10/09/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• RIOT-OS

Name

• RIOT

Version

• 2026.07

Website

• Product: https://github.com/RIOT-OS/RIOT/

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