CVE-2025-37945: Linux kernel · net: phy: allow MDIO bus PM ops to start/stop state machine for phylink-controlled PHY
Affects Linux kernelSource GCVE Database
Not known to be exploited · fixed in 5.15.63 : update Linux kernel when convenient.
Data as of 5 Nov 2026, 22:02 UTC
Rated Medium by Threat Radar's AI analysis · No CVSS score from NVD or the CNA
Thin evidence
One scorer or none- Patch
- Available – fixed in 5.15.63
Exploitation evidence
Disclosed: evidence found.
CVE published 20 May 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 5 Nov 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| Linux Linux | Affected
| Fixed in– |
AI-suggested
A fix is available in Linux kernel versions 5.15.63 and 5.19.4. Users and administrators should update to these or later kernel versions to resolve the issue. No additional mitigation actions are required beyond applying the official kernel update.
Description
CVE-2025-37945 is a vulnerability in the Linux kernel's network PHY subsystem where the MDIO bus power management operations do not properly start or stop the PHY state machine for phylink-controlled PHY devices during suspend and resume cycles. This can cause warnings and potential instability due to the PHY state machine running unexpectedly after resume. The issue affects certain DSA drivers and other MAC drivers using phylink with MDIO bus-managed PHY power management. The vulnerability has been addressed in Linux kernel versions 5.15.63 and 5.19.4.
References
- git.kernel.org/stable/c/17eef1e44883845b9567afc893dc41e004c08d65 (opens in a new tab)
- git.kernel.org/stable/c/043aa41c43f8cb9cce75367ea07895ce68b5abb0 (opens in a new tab)
- git.kernel.org/stable/c/a6ed6f8ec81b8ca7100dcd9e62bdbc0dff1b2259 (opens in a new tab)
- git.kernel.org/stable/c/54e5d00a8de6c13f6c01a94ed48025e882cd15f7 (opens in a new tab)
- git.kernel.org/stable/c/bd4037d51d3f6667636a1383e78e48a5b7b60755 (opens in a new tab)
- git.kernel.org/stable/c/fc75ea20ffb452652f0d4033f38fe88d7cfdae35 (opens in a new tab)
- cert-portal.siemens.com/productcert/html/ssa-082556.html (opens in a new tab)
- cert-portal.siemens.com/productcert/html/ssa-019113.html (opens in a new tab)
- cert-portal.siemens.com/productcert/html/ssa-457936.html (opens in a new tab)