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CVE-2026-124742

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

5.5 Medium

CVE-2026-124742 is a medium vulnerability (CVSS 5.5) in Red Hat Enterprise Linux 6, published November 11, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.19%, the 8th percentile. No source names a fixed version.

What does this mean?
Severity
5.5 MediumCVSS 3.1, CVE List
Exploit chance
0.19%EPSS, 8th percentile
Exploitation
None knownNot on CISA’s or ENISA’s lists
Fixed in
No fix listedNo source names one

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.

Attack profile

How easy it is to exploit

Attack vector
Local
Complexity
Low
Privileges needed
None
User interaction
Required

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
High

Exploit likelihood

0.19%Unchanged since Nov 12, 2026
90%50%10%1%

Discussion

Quiet in the last day.
14 days ago: 0 people13 days ago: 0 people12 days ago: 0 people11 days ago: 0 people10 days ago: 0 people9 days ago: 0 people8 days ago: 0 people7 days ago: 0 people6 days ago: 0 people5 days ago: 0 people4 days ago: 0 people3 days ago: 0 people2 days ago: 0 people1 day ago: 1 personLast 24 hours: 0 people

Affected products

Affected packages

Affected packages
PackageAffectedFixed
busybox
Red Hat:hummingbird:1
From an advisory covering 2 CVEs
before 1:1.37.0-9.5.hum1
1:1.37.0-9.5.hum1
busybox-petitboot
Red Hat:hummingbird:1
From an advisory covering 2 CVEs
before 1:1.37.0-9.5.hum1
1:1.37.0-9.5.hum1
busybox-shared
Red Hat:hummingbird:1
From an advisory covering 2 CVEs
before 1:1.37.0-9.5.hum1
1:1.37.0-9.5.hum1
busybox
Ubuntu:Pro:14.04:LTS
All versions, plus listed versions
1:1.20.0-8.1ubuntu11:1.20.0-9ubuntu11:1.20.0-9ubuntu21:1.21.0-1ubuntu11:1.21.0-1ubuntu1.41:1.21.0-1ubuntu1.4+esm1
None known
busybox
Ubuntu:Pro:16.04:LTS
All versions, plus listed versions
1:1.22.0-15ubuntu11:1.22.0-15ubuntu1.41:1.22.0-15ubuntu1.4+esm11:1.22.0-15ubuntu1.4+esm2
None known
busybox
Ubuntu:Pro:18.04:LTS
All versions, plus listed versions
1:1.22.0-19ubuntu21:1.27.2-1ubuntu31:1.27.2-1ubuntu41:1.27.2-2ubuntu21:1.27.2-2ubuntu3
Show 5 moreShow less
1:1.27.2-2ubuntu3.11:1.27.2-2ubuntu3.21:1.27.2-2ubuntu3.31:1.27.2-2ubuntu3.41:1.27.2-2ubuntu3.4+esm1
None known
busybox
Ubuntu:20.04:LTS
All versions, plus listed versions
1:1.30.1-4ubuntu41:1.30.1-4ubuntu51:1.30.1-4ubuntu61:1.30.1-4ubuntu6.11:1.30.1-4ubuntu6.21:1.30.1-4ubuntu6.31:1.30.1-4ubuntu6.41:1.30.1-4ubuntu6.5
None known
busybox
Ubuntu:22.04:LTS
All versions, plus listed versions
1:1.30.1-6ubuntu31:1.30.1-7ubuntu11:1.30.1-7ubuntu21:1.30.1-7ubuntu31:1.30.1-7ubuntu3.1
None known
busybox
Ubuntu:24.04:LTS
All versions, plus listed versions
1:1.36.1-3ubuntu11:1.36.1-6ubuntu11:1.36.1-6ubuntu31:1.36.1-6ubuntu3.1
None known
busybox
Ubuntu:26.10
All versions, plus listed versions
1:1.37.0-7ubuntu11:1.37.0-10.1ubuntu21:1.37.0-10.1ubuntu31:1.38.0-3ubuntu11:1.38.0-3ubuntu31:1.38.0-3ubuntu4
None known
busybox
Ubuntu:26.04:LTS
All versions, plus listed versions
1:1.37.0-4ubuntu11:1.37.0-7ubuntu1
None known

What each source reports

CVE List Score used5.5

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

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.

Record
CVE-2026-124742
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Weakness
CWE-369
Updated
2026-11-13
EUVDEUVD-2026-1233595.5

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.

Record
EUVD-2026-123359
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated
2026-11-13
GitHub AdvisoriesGHSA-whhw-82c4-82xv5.5

A flaw was found in BusyBox. The volume identification component fails to properly validate...

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.

Record
GHSA-whhw-82c4-82xv
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Weakness
CWE-369
Updated
2026-11-13
NVD5.5

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.

Record
CVE-2026-124742
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Weakness
CWE-369
Updated
2026-11-13
OSV5.5

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

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.

Record
CVE-2026-124742
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Weakness
CWE-369
Updated
2026-11-14
OSVRHSA-2026:995776.5

Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update

Record
RHSA-2026:99577
CVSS 3.1
6.5 MediumCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-13
OSVUBUNTU-CVE-2026-1247425.5

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.

Record
UBUNTU-CVE-2026-124742
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated
2026-11-13

History

History
RecordedChangedSources
referencesOSV
affected, aliases, referencesEUVD, GitHub Advisories, NVD, OSV
referencesCVE List, OSV
affected, aliases, referencesOSV
referencesOSV
publishedEUVD, NVD
publishedEUVD
products, references, severity, titleCVE List
aliases, cwes, references, severity, titleGitHub Advisories
first indexedEUVD

Dates are when Every CVE recorded each change. Upstream dates may differ.

References

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