Bug 2460390 (CVE-2026-40706)

Summary: CVE-2026-40706 ntfs-3g: NTFS-3G: Arbitrary code execution via crafted NTFS image
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: high    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in NTFS-3G. An attacker can exploit this by creating a specially crafted NTFS file system image. When this image is processed, a vulnerability known as a heap buffer overflow occurs, which can corrupt the computer's memory. This corruption happens within the `ntfs-3g` program, which operates with elevated system privileges, potentially allowing an attacker to execute unauthorized code.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2461765, 2461766    
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Description OSIDB Bzimport 2026-04-21 22:01:29 UTC 
In NTFS-3G 2022.10.3 before 2026.2.25, a heap buffer overflow exists in ntfs_build_permissions_posix() in acls.c that allows an attacker to corrupt heap memory in the SUID-root ntfs-3g binary by crafting a malicious NTFS image. The overflow is triggered on the READ path (stat, readdir, open) when processing a security descriptor with multiple ACCESS_DENIED ACEs containing WRITE_OWNER from distinct group SIDs.