CVE-2026-15390

Out-of-bounds write in Das U-Boot

State: Published
Severity: 9.0 Critical
Published: Sep 29, 2026
Updated: Sep 29, 2026
Reserved: Jul 10, 2026

Description

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 in version 2026.07.

Scores

CVSS	Score	Vector	Source
4.0	9.0 Critical	CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H	CERT-PL

Weaknesses

CWE-787 Out-of-bounds write
CWE-459 Incomplete cleanup

Affected Products

Product	Versions
Das U-BootDENX Software Engineering	2009.08 through 2026.07Affectedfrom commit b1aec609bb5e0d08c25c888c91935287ab4ee5faNot affected

References

https://cert.pl/en/posts/2026/09/CVE-2026-15390third-party-advisory
https://source.denx.de/u-boot/u-boot/-/commit/b1aec609bb5e0d08c25c888c91935287ab4ee5fapatch

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