VDB-411284 · CVE-2026-15390 · WID-SEC-2026-3631

DENX Software Engineering Das U-Boot up to 2026.07 IP Defragmentation privileges management

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
9.5	$0-$5k	1.06

Summaryinfo

A vulnerability was found in DENX Software Engineering Das U-Boot up to 2026.07. It has been declared as very critical. Impacted is an unknown function of the component IP Defragmentation. Such manipulation leads to privileges management. This vulnerability is traded as CVE-2026-15390. The attack may be launched remotely. There is no exploit available. It is advisable to implement a patch to correct this issue.

Detailsinfo

A vulnerability, which was classified as very critical, has been found in DENX Software Engineering Das U-Boot up to 2026.07. Affected by this issue is some unknown processing of the component IP Defragmentation. The manipulation with an unknown input leads to a privileges management vulnerability. Using CWE to declare the problem leads to CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at cert.pl. This vulnerability is handled as CVE-2026-15390 since 07/10/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 09/29/2026). The MITRE ATT&CK project declares the attack technique as T1068.

Applying the patch b1aec609bb5e0d08c25c888c91935287ab4ee5fa is able to eliminate this problem.

The vulnerability is also documented in the vulnerability database at CERT Bund (WID-SEC-2026-3631). Once again VulDB remains the best source for vulnerability data.

Affected

DENX U-Boot

Productinfo

Vendor

DENX Software Engineering

Name

Das U-Boot

Version

2026.07

License

free

CPE 2.3info

🔒

CPE 2.2info

🔒

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 10.0
VulDB Meta Temp Score: 9.5

VulDB Base Score: 10.0
VulDB Temp Score: 9.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Privileges management
CWE: CWE-269 / CWE-266
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔒

Patch: b1aec609bb5e0d08c25c888c91935287ab4ee5fa

Timelineinfo

07/10/2026 CVE reserved
09/29/2026 +81 days Advisory disclosed
09/29/2026 +0 days VulDB entry created
09/29/2026 +0 days VulDB entry last update

Sourcesinfo

Advisory: cert.pl
Status: Confirmed

CVE: CVE-2026-15390 (🔒)
GCVE (CVE): GCVE-0-2026-15390
GCVE (VulDB): GCVE-100-411284
CERT Bund: WID-SEC-2026-3631 - DENX U-Boot: Schwachstelle ermöglicht Codeausführung

Entryinfo

Created: 09/29/2026 12:26
Updated: 09/29/2026 17:28
Changes: 09/29/2026 12:26 (66), 09/29/2026 17:28 (7)
Complete: 🔍
Cache ID: 216::103