---
id: CVE-2026-15390
title: "Das U-Boot\_with CONFIG_IP_DEFRAG=y parameter fails to clear IP reassembly state after delivering a complete datagram"
summary: "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 pac…"
severity: critical
cvss: 9
cvssVector: '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'
cwe:
  - CWE-459
  - CWE-787
vendor: DENX Software Engineering
product: Das U-Boot
affected:
  - das_u-boot >= 2009.08 <= 2026.07
published: '2026-09-29'
updated: '2026-09-29'
sourceUpdated: '2026-09-29T11:16:42.610'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-15390'
references:
  - url: 'https://cert.pl/en/posts/2026/09/CVE-2026-15390'
    label: cvd@cert.pl
  - url: >-
      https://source.denx.de/u-boot/u-boot/-/commit/b1aec609bb5e0d08c25c888c91935287ab4ee5fa
    label: cvd@cert.pl
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-29T10:53:14.845353Z'
cvssSource: cna
ingestedAt: '2026-09-29T10:31:36.310Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.