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

Vulnerability from cvelistv5 – Published: 2025-06-28 07:52 – Updated: 2025-11-03 17:33
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 ?
No CVSS data available.
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)
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    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)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ch9200: fix uninitialised access during mii_nway_restart\n\nIn mii_nway_restart() the code attempts to call\nmii-\u003emdio_read which is ch9200_mdio_read(). ch9200_mdio_read()\nutilises a local buffer called \"buff\", which is initialised\nwith control_read(). However \"buff\" is conditionally\ninitialised inside control_read():\n\n        if (err == size) {\n                memcpy(data, buf, size);\n        }\n\nIf the condition of \"err == size\" is not met, then\n\"buff\" remains uninitialised. 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."
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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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