---
id: "CVE-2026-124742"
page: "https://infrastack.ai/live/CVE-2026-124742"
kind: "vulnerability"
aliases: ["CVE-2026-124742"]
title: "BusyBox: crafted FAT disk image crashes volume probing utilities"
severity: "medium"
cvss: 5.5
epss: null
exploited: false
status: "open"
category: "runtime"
products: [{"name": "busybox", "fixed": [], "affected": "", "ecosystem": "runtime"}]
ecosystems: ["runtime"]
tags: ["busybox", "embedded-linux", "linux", "runtime"]
not_affected_if: ["no-untrusted-disks"]
published_at: "2026-11-11T12:19:47+00:00"
first_seen_at: "2026-11-11T12:27:11+00:00"
updated_at: "2026-11-11T12:28:41+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-124742", "first_seen_at": "2026-11-11T12:27:11+00:00"}]
exploit_sources: []
---

# BusyBox: crafted FAT disk image crashes volume probing utilities

Link for people: https://infrastack.ai/live/CVE-2026-124742 (this .md is for agents)

A malformed FAT filesystem can make BusyBox's volume identification code divide by zero and crash. An attacker who can present a crafted storage device or disk image can cause a denial of service that disrupts device discovery and boot.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- runtime:busybox affected range not listed fixed no fixed version listed

## How to check

- Check the BusyBox version with `busybox --help` on systems that ship it

## Timeline

- 2026-11-11T12:27:11+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-124742

## Documents

- [fix] Patch: github.com https://github.com/vda-linux/busybox_mirror/commit/b7c89c4

## From the sources

A flaw was found in BusyBox. The volume identification component fails to properly validate cluster parameters when analyzing specially formatted FAT filesystems. An attacker able to present a crafted storage device or disk image can trigger a divide-by-zero condition when partition scanning utilities inspect the volume. This issue causes the probing utilities to crash unexpectedly, resulting in a Denial of Service (DoS) that can disrupt device discovery and system boot operations.

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