---
id: CVE-2025-70293
title: An issue was discovered in Denx U-Boot before 2026.04
summary: >-
  An issue was discovered in Denx U-Boot before 2026.04. An integer overflow
  vulnerability exists in function ext4fs_get_bgdtable, the size calculation can
  lead to under allocation and this underallocated buffer will be used in
  memcpy() wh…
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-122
  - CWE-190
published: '2026-08-26'
updated: '2026-09-09'
sourceUpdated: '2026-09-09T16:04:24.933'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-70293'
references:
  - url: 'http://denx.com'
    label: cve@mitre.org
  - url: 'http://u-boot.com'
    label: cve@mitre.org
  - url: 'https://gist.github.com/c0zy1/4d9648d10a5ff07bda2771ea1298e469'
    label: cve@mitre.org
tags:
  - nvd
epss: 0.00535
epssPercentile: 0.4409
ingestedAt: '2026-09-09T16:14:05.516Z'
---

## Overview

An issue was discovered in Denx U-Boot before 2026.04. An integer overflow vulnerability exists in function ext4fs_get_bgdtable, the size calculation can lead to under allocation and this underallocated buffer will be used in memcpy() which could lead to arbitrary code execution, a denial of service, or other unspecified impacts.

## Remediation

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