BusyBox volume_id: Divide-by-zero and heap over-read in HFS+ prober
Summary
A flaw in the volume identification code of BusyBox, used when probing filesystem metadata, does not properly validate header values in HFS+ filesystems. An attacker who can attach a storage device or supply a specially crafted filesystem image can crash the probing application, causing a denial of service and preventing device resolution. The CNA vector requires local access and user interaction and does not indicate any confidentiality or integrity impact. Red Hat rates the issue as Moderate and notes that BusyBox is typically limited to rescue shells or initramfs environments in Red Hat Enterprise Linux.
Affected
- Red Hat Enterprise Linux 6 (default status: unknown)
- Red Hat Hardened Images (default status: affected)
- Affected BusyBox version numbers: Unknown.
Fixed in
Unknown. No fixed version has been published by Red Hat at the time of writing.
Workaround
- No mitigation is available that meets Red Hat Product Security criteria.
- Treat removable media and unknown disk images as untrusted; do not auto-probe or mount them on affected hosts.
- Consider disabling udev auto-probing of removable devices where practical.
Exploitation
- Not known to be exploited in the wild; not listed in CISA KEV.
- No public proof of concept found in the sources checked.
- The title mentions a heap over-read, but the description only confirms a crash; the memory-read impact is possible but unconfirmed.
Our recommendation
- Check whether RHEL 6 or Red Hat Hardened Images are in use, especially on hosts that accept removable media.
- Restrict or disable automatic probing and mounting of untrusted USB media and disk images.
- Monitor the Red Hat advisory and bugzilla for an erratum or BusyBox package update, and apply it when available.
- Priority: medium-low for most SMEs.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Red Hat CVE record CVE-2026-124743 access.redhat.com
- Red Hat Bugzilla 2571624 bugzilla.redhat.com
- CVE Program record www.cve.org
- OffSeq radar entry radar.offseq.com
- OSV OESA-2026-4528 osv.dev
- BusyBox mailing list NTFS prober patch www.mail-archive.com
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 11 Nov 2026, 16:06.
Original description (NVD)
A flaw was found in BusyBox. When processing filesystem metadata, the volume identification component does not properly validate header values in HFS+ filesystems. An attacker able to attach a storage device or supply a specially crafted filesystem image can trigger an application crash, resulting in a Denial of Service (DoS) and preventing device resolution.
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
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