CVSS 3.1
5.5 mediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:HCVE-2026-124742 Busybox: divide-by-zero in the volume_id fat prober via a zero sectors_per_cluster value
Medium (5.5) in red hat. EPSS 0.2% estimated probability of exploitation activity in the next 30 days.
On this page
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.
Severity
- EPSS
- 0.2% estimated probability of exploitation activity in the next 30 days; 8th percentile. Scored 2026-11-13. A forecast for this CVE across the internet, not for your own systems.
- CWE
- CWE-369 Divide By Zero
- OWASP Top 10
- A10:2025 Mishandling of Exceptional Conditions
- Published
- Modified
- Assigned by
- redhat (CNA)
- NVD analysis
- Awaiting analysis
- Record from
- the NVD, synced
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Affected
- red hat:red hat enterprise linux 6
- red hat:red hat hardened images
Versions
From the CNA's record in the CVE List.
Fixed in
| Product | Fixed in |
|---|---|
| Red Hat Hardened Images | 1.37.0-9.5.hum1 |
Fix and patched versions
- Red Hat Red Hat Hardened Images: fixed in 1.37.0-9.5.hum1
- Red Hat: fixed package versions per release
Linux distributions
| Distribution | Release | Package | Fixed in | Advisory |
|---|---|---|---|---|
| Ubuntu | 20.04:LTS, 22.04:LTS, 24.04:LTS and 5 more | busybox | no fix listed | UBUNTU-CVE-2026-124742 |
| Red Hat | hummingbird:1 | busybox, busybox-shared, busybox-petitboot | 1:1.37.0-9.5.hum1 | RHSA-2026:99577 |
From the distributions' data via OSV.dev: Ubuntu Security Notices © Canonical Ltd., CC BY-SA 4.0; Red Hat Security Data © Red Hat, Inc., CC BY 4.0. Modified: reformatted and linked to CVE records. Credits. On the distributions' own pages: Ubuntu · Red Hat.
Red Hat
Red Hat rates this Moderate.
This vulnerability is rated as Moderate severity because it requires local access or the introduction of a specially crafted block device to trigger an unhandled application crash, presenting a denial-of-service risk rather than arbitrary code execution. In standard Red Hat Enterprise Linux environments, core storage probing and mounting utilities are provided by util-linux rather than BusyBox, which confines exposure to specific recovery environments or minimal container images. In those contexts, an attacker would need the ability to supply untrusted storage media to disrupt device resolution during boot or hotplug handling.
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.
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 6 | busybox | Out of support scope | |
| Red Hat Hardened Images | busybox | Affected |
Contains Red Hat Security Data © Red Hat, Inc., licensed under CC BY 4.0. Source: https://access.redhat.com/security/data. Modified: reformatted. Red Hat's page for CVE-2026-124742.