Bug 2547442 (CVE-2026-42618)

Summary: CVE-2026-42618 ntfs-3g: ntfs-3g: Privilege escalation via heap-based buffer overflow in ntfs_decompress()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in ntfs-3g. A local attacker could achieve privilege escalation or cause a denial of service (DoS) by mounting or accessing a specially crafted NTFS filesystem image. When the privileged binary reads a malicious file from the image, a heap-based buffer overflow occurs in the ntfs_decompress function, corrupting memory within the elevated process.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2547625, 2547626    
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Description OSIDB Bzimport 2026-10-07 14:01:31 UTC 
In NTFS-3G before 2026.7.7, a heap buffer overflow exists in ntfs_decompress() in compress.c that allows an attacker to corrupt one byte of heap memory in the SUID-root ntfs-3g binary by crafting a malicious NTFS image. The overflow is triggered by reading the special crafted file.