Memory disclosure and crash via zero-length Geneve option
Published Apr 16, 2025 · Updated Sep 8, 2026
Out-of-bounds read in the Linux kernel Geneve option parser allows local users to disclose kernel memory or crash the system. The Netlink policies accept an exact 128-byte Geneve option even though geneve_opt stores length in five bits, so the length wraps to zero and confuses parsing into an over-read. Exploitation requires low-privileged local access able to submit the crafted option; observed consequences include a 124-byte slab over-read and a kernel fault.
Summary
What happened
Out-of-bounds read in the Linux kernel Geneve option parser allows local users to disclose kernel memory or crash the system. The Netlink policies accept an exact 128-byte Geneve option even though geneve_opt stores length in five bits, so the length wraps to zero and confuses parsing into an over-read. Exploitation requires low-privileged local access able to submit the crafted option; observed consequences include a 124-byte slab over-read and a kernel fault.
The record
- CVE
- CVE-2025-22055
- Published
- Apr 16, 2025
- Updated
- Sep 8, 2026
- Vendor
- Siemens
- Product
- SIPLUS S7-1500 CPU 1518-4 PN/DP MFP
- Classifications
- CWE-125
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Apr 16, 2025CVE publishedPublication date reported by the CVE source.
- Sep 8, 2026Record updatedLatest update available in the CVE record.
Exploitability
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Is a vulnerable build present?
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- Affected versionversion=V3.1.6 <*
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What is affected?
Published CVSS scores
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Attacks
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Weakness, pattern, technique
Public exploit references
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Technologies
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Your stack
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