Vulnerability in Das U-Boot software

CERT Polska has received a report about vulnerability in DENX Software Engineering Das U-Boot software and participated in coordination of its disclosure.

The vulnerabilityCVE-2026-15390: Das U-Boot with CONFIG_IP_DEFRAG=y parameter fails to clear IP reassembly state after delivering a complete datagram. An attacker who can deliver fragmented IP traffic can execute arbitrary code by sending duplicated last-fragment IP packets.

This issue was fixed in commit b1aec609bb5e0d08c25c888c91935287ab4ee5fa included in release version 2026.07.

We thank Mateusz Furdyna from Nokia for the responsible vulnerability report.