# CVE-2026-124742: Busybox: divide-by-zero in the volume_id fat prober via a zero sectors_per_cluster value

Status: published. Published: 2026-11-11. Updated: 2026-11-11.

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.

## Remediation

- workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability. (source: CNA: redhat)

## Affected products and versions

- Red Hat / Red Hat Enterprise Linux 6 (busybox): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Hardened Images (busybox): Version range not reported. Source: CNA: redhat

## Severity and prioritization

- CVSS 3.1: 5.5 (medium); CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H; source: CNA: redhat

- CVSS 3.1: 5.5 (medium); CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H; source: NVD: secalert@redhat.com

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-369

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://access.redhat.com/security/cve/CVE-2026-124742 (CNA: redhat; vdb-entry, x_refsource_REDHAT)

- https://bugzilla.redhat.com/show_bug.cgi?id=2571620 (CNA: redhat; issue-tracking, x_refsource_REDHAT)

- https://github.com/vda-linux/busybox_mirror/commit/b7c89c4 (CNA: redhat)

- https://access.redhat.com/security/cve/CVE-2026-124742 (secalert@redhat.com)

- https://bugzilla.redhat.com/show_bug.cgi?id=2571620 (secalert@redhat.com)

- https://github.com/vda-linux/busybox_mirror/commit/b7c89c4 (secalert@redhat.com)

## Provenance

- CNA: redhat: https://www.cve.org/CVERecord?id=CVE-2026-124742; retrieved 2026-11-11; source updated 2026-11-11

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-124742; retrieved 2026-11-11; source updated 2026-11-11

Revision: dfdb08556fd82ca8e006f1b8e668265bb7698a9c65ad9f2a428be7d7345480f1

Canonical: https://y2.dev/cve/CVE-2026-124742

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