Local kernel crash via unstopped PHY state machine
Published May 20, 2025 · Updated Sep 8, 2026
Denial of service in Linux kernel PHY power management allows local users to crash systems during suspend and resume cycles. mdio_bus_phy_suspend() skips phy_stop_machine() when phylink leaves phydev->adjust_link NULL, so resume encounters a running PHY state machine in PHY_NOLINK. Exploitation requires local access and a phylink-controlled PHY using MDIO-bus-managed power operations; the bounded impact is a kernel crash.
Summary
What happened
Denial of service in Linux kernel PHY power management allows local users to crash systems during suspend and resume cycles. mdio_bus_phy_suspend() skips phy_stop_machine() when phylink leaves phydev->adjust_link NULL, so resume encounters a running PHY state machine in PHY_NOLINK. Exploitation requires local access and a phylink-controlled PHY using MDIO-bus-managed power operations; the bounded impact is a kernel crash.
The record
- CVE
- CVE-2025-37945
- Published
- May 20, 2025
- Updated
- Sep 8, 2026
- Vendor
- Siemens
- Product
- SIPLUS S7-1500 CPU 1518-4 PN/DP MFP
- Classifications
- CWE-20, T1529
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- May 20, 2025CVE publishedPublication date reported by the CVE source.
- Sep 8, 2026Record updatedLatest update available in the CVE record.
Exploitability
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- Affected versionversion=V3.1.5 <*
- Affected versionversion=V3.1.6 <*
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
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Technologies
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Your stack
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