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CVE-2026-124742

Busybox: divide-by-zero in the volume_id fat prober via a zero sectors_per_cluster value

Products / packages Red Hat Hardened Images · Red Hat Enterprise Linux 6

Published

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Severity and exploitation

Not in CISA KEV

KEV coverage does not rule out exploitation.

KEV checked 14/11/2026, 22:00:33 UTC
redhat · CVSS:3.1 · 5.5
Assessment vectorCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Severity

medium5.5

CVSS measures technical severity, not the likelihood of an attack.

Known exploitation

Not listed in the checked CISA KEV catalog

Absence from CISA KEV does not rule out attacks.

Public exploit

Not established by this record

Missing evidence does not mean no public exploit exists.

Remediation

Source guidance available

Review the recorded instructions. Guidance may be a workaround rather than a fixed version.

What this means

BusyBox has a divide-by-zero flaw in the volume_id fat prober via a zero sectors_per_cluster value, allowing an attacker with crafted storage access to cause a Denial of Service (DoS) crash. The issue affects partition scanning utilities. Impact on specific versions is uncertain.

Summarized by @cf/meta/llama-3.3-70b-instruct-fp8-fast. Verify details against the original sources.

Attack conditions

No attack-condition excerpt has been identified here. Review the full source description and references for authentication, network access, and configuration requirements.

Review supporting sources →

Affected versions

Check the exact model, release, and any platform requirements against your installation.

Red Hat · redhat

Red Hat Hardened Images

1 range
redhat version evidence

Compare with this publisher’s ranges. This does not inspect your installation.

affected

unaffected

1.37.0-9.5.hum1 → before *

rpm versions

unknown

Other versions: affected

Product identifiers (CPE)cpe:/a:redhat:hummingbird:1

Red Hat · redhat

Red Hat Enterprise Linux 6

0 ranges
redhat version evidence

Compare with this publisher’s ranges. This does not inspect your installation.

affected

unaffected

unknown

Other versions: unknown

Product identifiers (CPE)cpe:/o:redhat:rhel_els:6
Automatic dependency matching is unavailable for this record. Use the product evidence and publisher’s instructions to check your installation.

What to do

Compare your installed product and version with the affected versions above. A matching product name alone does not confirm exposure.

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.

redhat guidance ↗

cve.new guidance unless attributed to a publisher. This page does not inspect your installation.

Public exploit evidence

No public exploit reference is identified in the imported evidence. This is not a claim that no exploit exists.

Original source description

Read the full publisher description

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.

References

4 sources
access.redhat.com/errata/RHSA-2026:99577
Vendor advisoryredhat
access.redhat.com/security/cve/CVE-2026-124742
Security advisoryredhat
bugzilla.redhat.com/show_bug.cgi
Source referenceredhat
vda-linux/busybox_mirror · commit b7c89c4
Patchredhat

Inside the record

Evidence available

Package identity · not supplied
Version evidence
Remediation guidance
Weakness classification
Additional publishers · not supplied

Describes the evidence in this view, not whether the product is safe.

Original records

CVE-2026-124742

View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.

cve.new JSON →

Underlying weaknesses

The source’s classification of what caused the vulnerability.

CWE-369 ↗

Divide By Zero

redhat

Related →
Contributing organizations · 1
redhat

Assigning organization

2026-11-13

Timeline

All times UTC

  1. Advisory published

    Publication date supplied by the source.

  2. Source updated

    Latest modification date supplied by the source.

  3. Last imported by cve.new

    Latest catalog import, not the date we first saw this advisory.

What changed

Follow changes
  1. CVE · CVE-2026-124742

    Observed 2026-11-13T14:16:57.202Z · upstream updated 2026-11-13T13:32:57.527Z

    Product or version evidence changed

    before

    [
  {
    "vendor": "Red Hat",
    "name": "Red Hat Enterprise Linux 6",
    "platforms": [],
    "versions": [],
    "defaultStatus": "unknown",
    "cpes": [
      "cpe:/o:redhat:rhel_els:6"
    ],
    "source": "redhat",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-124742"
  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat Hardened Images",
    "platforms": [],
    "versions": [],
    "defaultStatus": "affected",
    "cpes": [
      "cpe:/a:redhat:hummingbird:1"
    ],
    "source": "redhat",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-124742"
  }
]

    after

    [
  {
    "vendor": "Red Hat",
    "name": "Red Hat Hardened Images",
    "platforms": [],
    "versions": [
      {
        "version": "1.37.0-9.5.hum1",
        "status": "unaffected",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "defaultStatus": "affected",
    "cpes": [
      "cpe:/a:redhat:hummingbird:1"
    ],
    "source": "redhat",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-124742"
  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat Enterprise Linux 6",
    "platforms": [],
    "versions": [],
    "defaultStatus": "unknown",
    "cpes": [
      "cpe:/o:redhat:rhel_els:6"
    ],
    "source": "redhat",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-124742"
  }
]
    References changed

    before

    [
  "https://access.redhat.com/security/cve/CVE-2026-124742",
  "https://bugzilla.redhat.com/show_bug.cgi?id=2571620",
  "https://github.com/vda-linux/busybox_mirror/commit/b7c89c4"
]

    after

    [
  "https://access.redhat.com/errata/RHSA-2026:99577",
  "https://access.redhat.com/security/cve/CVE-2026-124742",
  "https://bugzilla.redhat.com/show_bug.cgi?id=2571620",
  "https://github.com/vda-linux/busybox_mirror/commit/b7c89c4"
]

Large field values are marked as truncated previews. Original source snapshots remain retained.

Showing up to 50 most recent observed changes.