Filesystem data exposure and corruption via LCN overflow
Published Aug 15, 2026 · Updated Aug 15, 2026
Integer overflow in Linux before 7.1.5 allows attackers to redirect NTFS file access to unintended physical clusters via a crafted volume. The ntfs_mapping_pairs_decompress() function adds each untrusted signed LCN delta to a 64-bit accumulator without checking overflow, while its one-sided lower-bound test misses positive wraparound. Exploitation requires the crafted NTFS volume to be mounted and a file accessed; resulting cluster misdirection can expose or corrupt filesystem data.
Summary
What happened
Integer overflow in Linux before 7.1.5 allows attackers to redirect NTFS file access to unintended physical clusters via a crafted volume. The ntfs_mapping_pairs_decompress() function adds each untrusted signed LCN delta to a 64-bit accumulator without checking overflow, while its one-sided lower-bound test misses positive wraparound. Exploitation requires the crafted NTFS volume to be mounted and a file accessed; resulting cluster misdirection can expose or corrupt filesystem data.
The record
- CVE
- CVE-2026-72200
- Published
- Aug 15, 2026
- Updated
- Aug 15, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- CWE-190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 15, 2026CVE publishedPublication date reported by the CVE source.
- Aug 15, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <7.1.5
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7fb64788812d137b37f6d8724e1e41c624c1e814
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ec4f061f2219e0f0c6465d56d0380bf749235a53
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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