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CVE-2025-38086— net: ch9200: fix uninitialised access during mii_nway_restart

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于ch9200未初始化访问，可能导致内存损坏。

AI Predicted 5.5 Difficulty: Hard EPSS 0.20% · P9

Possible ATT&CK Techniques 1 AI

T1200 · Hardware Additions

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 4a476bd6d1d923922ec950ddc4c27b279f6901eb< 119766de4930ff40db9f36b960cb53b0c400e81b affected
4a476bd6d1d923922ec950ddc4c27b279f6901eb< 33163c68d2e3061fa3935b5f0a1867958b1cdbd2 affected
4a476bd6d1d923922ec950ddc4c27b279f6901eb< 9da3e442714f7f4393ff01c265c4959c03e88c2f affected
4a476bd6d1d923922ec950ddc4c27b279f6901eb< 9a350f30d65197354706b7759b5c89d6c267b1a9 affected
4a476bd6d1d923922ec950ddc4c27b279f6901eb< 6bd2569d0b2f918e9581f744df0263caf73ee76c affected
4a476bd6d1d923922ec950ddc4c27b279f6901eb< 4da7fcc098218ff92b2e83a43f545c02f714cedd affected
4a476bd6d1d923922ec950ddc4c27b279f6901eb< cdaa6d1cb2ff1219c6c822b27655dd170ffb0f72 affected
4a476bd6d1d923922ec950ddc4c27b279f6901eb< 9ad0452c0277b816a435433cca601304cfac7c21 affected
… +10 more rows
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I. Basic Information for CVE-2025-38086

Vulnerability Information
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Vulnerability Title
net: ch9200: fix uninitialised access during mii_nway_restart
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net: ch9200: fix uninitialised access during mii_nway_restart In mii_nway_restart() the code attempts to call mii->mdio_read which is ch9200_mdio_read(). ch9200_mdio_read() utilises a local buffer called "buff", which is initialised with control_read(). However "buff" is conditionally initialised inside control_read(): if (err == size) { memcpy(data, buf, size); } If the condition of "err == size" is not met, then "buff" remains uninitialised. Once this happens the uninitialised "buff" is accessed and returned during ch9200_mdio_read(): return (buff[0] | buff[1] << 8); The problem stems from the fact that ch9200_mdio_read() ignores the return value of control_read(), leading to uinit-access of "buff". To fix this we should check the return value of control_read() and return early on error.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于ch9200未初始化访问，可能导致内存损坏。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 4a476bd6d1d923922ec950ddc4c27b279f6901eb ~ 119766de4930ff40db9f36b960cb53b0c400e81b -
Linux Linux 4.3 -

II. Public POCs for CVE-2025-38086

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III. Intelligence Information for CVE-2025-38086

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Same Patch Batch · Linux · 2025-06-28 · 3 CVEs total

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CVE-2025-38084 7.8 HIGH mm/hugetlb: unshare page tables during VMA split, not before

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-38086

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