Bug 2571624 (CVE-2026-124743)

Summary: CVE-2026-124743 busybox: Divide-by-zero and heap over-read in the volume_id HFS+ prober
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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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.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Bug Depends On: 2571626, 2571627    
Bug Blocks:    

Description OSIDB Bzimport 2026-11-11 09:54:19 UTC
A flaw was found in BusyBox's volume_id HFS+ prober. A blocksize value of 0 in the volume header is used as a divisor, causing a divide-by-zero (SIGFPE) crash, and the catalog leaf_node_size is never validated, allowing a heap out-of-bounds read. A crafted HFS+ filesystem image on an attached device triggers these issues when probed by blkid, findfs or mount LABEL=/UUID=, causing the probing applet to crash and preventing device resolution.