CVE-2025-38086 (GCVE-0-2025-38086)

Vulnerability from cvelistv5 – Published: 2025-06-28 07:52 – Updated: 2026-05-11 21:20
VLAI
Title
net: ch9200: fix uninitialised access during mii_nway_restart
Summary
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.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 4a476bd6d1d923922ec950ddc4c27b279f6901eb , < 119766de4930ff40db9f36b960cb53b0c400e81b (git)
Affected: 4a476bd6d1d923922ec950ddc4c27b279f6901eb , < 33163c68d2e3061fa3935b5f0a1867958b1cdbd2 (git)
Affected: 4a476bd6d1d923922ec950ddc4c27b279f6901eb , < 9da3e442714f7f4393ff01c265c4959c03e88c2f (git)
Affected: 4a476bd6d1d923922ec950ddc4c27b279f6901eb , < 9a350f30d65197354706b7759b5c89d6c267b1a9 (git)
Affected: 4a476bd6d1d923922ec950ddc4c27b279f6901eb , < 6bd2569d0b2f918e9581f744df0263caf73ee76c (git)
Affected: 4a476bd6d1d923922ec950ddc4c27b279f6901eb , < 4da7fcc098218ff92b2e83a43f545c02f714cedd (git)
Affected: 4a476bd6d1d923922ec950ddc4c27b279f6901eb , < cdaa6d1cb2ff1219c6c822b27655dd170ffb0f72 (git)
Affected: 4a476bd6d1d923922ec950ddc4c27b279f6901eb , < 9ad0452c0277b816a435433cca601304cfac7c21 (git)
Create a notification for this product.
Linux Linux Affected: 4.3
Unaffected: 0 , < 4.3 (semver)
Unaffected: 5.4.295 , ≤ 5.4.* (semver)
Unaffected: 5.10.239 , ≤ 5.10.* (semver)
Unaffected: 5.15.186 , ≤ 5.15.* (semver)
Unaffected: 6.1.142 , ≤ 6.1.* (semver)
Unaffected: 6.6.95 , ≤ 6.6.* (semver)
Unaffected: 6.12.35 , ≤ 6.12.* (semver)
Unaffected: 6.15.4 , ≤ 6.15.* (semver)
Unaffected: 6.16 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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Once this happens the\\nuninitialised \\\"buff\\\" is accessed and returned during\\nch9200_mdio_read():\\n\\n        return (buff[0] | buff[1] \u003c\u003c 8);\\n\\nThe problem stems from the fact that ch9200_mdio_read()\\nignores the return value of control_read(), leading to\\nuinit-access of \\\"buff\\\".\\n\\nTo fix this we should check the return value of\\ncontrol_read() and return early on error.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: ch9200: correcci\u00f3n del acceso no inicializado durante mii_nway_restart. En mii_nway_restart(), el c\u00f3digo intenta llamar a mii-\u0026gt;mdio_read, que es ch9200_mdio_read(). ch9200_mdio_read() utiliza un b\u00fafer local llamado \\\"buff\\\", que se inicializa con control_read(). 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  }
}


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