Kernel crash via zero PTP rate division
Published Jul 3, 2025 · Updated Sep 8, 2026
Divide-by-zero in the stmmac EST configuration code in affected Linux kernels allows local users to crash the kernel. The EST path in drivers/net/ethernet/stmicro/stmmac/stmmac_est.c uses a recorded ptp_rate of zero as a divisor instead of rejecting it. Exploitation requires low-privileged local access and EST configuration on an stmmac device; the reported impact is a kernel crash without data disclosure or modification.
Summary
What happened
Divide-by-zero in the stmmac EST configuration code in affected Linux kernels allows local users to crash the kernel. The EST path in drivers/net/ethernet/stmicro/stmmac/stmmac_est.c uses a recorded ptp_rate of zero as a divisor instead of rejecting it. Exploitation requires low-privileged local access and EST configuration on an stmmac device; the reported impact is a kernel crash without data disclosure or modification.
The record
- CVE
- CVE-2025-38125
- Published
- Jul 3, 2025
- Updated
- Sep 8, 2026
- Vendor
- Siemens
- Product
- SIPLUS S7-1500 CPU 1518-4 PN/DP MFP
- Classifications
- CWE-369, T1499
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Jul 3, 2025CVE publishedPublication date reported by the CVE source.
- Sep 8, 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=V3.1.6 <*
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
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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