Kernel panic via truncated ext4 inline-data length
Published Jul 4, 2025 · Updated Jul 14, 2026
Integer overflow in the ext4 inline-data path in Linux allows local users to crash the kernel through a large-offset sparse write. ext4_prepare_inline_data receives pos + len through an unsigned int, truncating the 64-bit write extent before ext4_write_inline_data enforces its inline-size assertion. A writable ext4 filesystem with inline_data enabled and low-privileged local access is required; successful exploitation causes a kernel panic and service interruption.
Summary
What happened
Integer overflow in the ext4 inline-data path in Linux allows local users to crash the kernel through a large-offset sparse write. ext4_prepare_inline_data receives pos + len through an unsigned int, truncating the 64-bit write extent before ext4_write_inline_data enforces its inline-size assertion. A writable ext4 filesystem with inline_data enabled and low-privileged local access is required; successful exploitation causes a kernel panic and service interruption.
The record
- CVE
- CVE-2025-38222
- Published
- Jul 4, 2025
- Updated
- Jul 14, 2026
- Vendor
- Siemens
- Product
- SIPLUS S7-1500 CPU 1518-4 PN/DP MFP
- Classifications
- CWE-190, T1499
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Jul 4, 2025CVE publishedPublication date reported by the CVE source.
- Jul 14, 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?
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- Affected versionversion=V3.1.5 <*
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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Public exploit references
- Linux kernel ext4 inline-data panic reproducerproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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