CVE-2025-38086 (GCVE-0-2025-38086)
Vulnerability from cvelistv5
Published
2025-06-28 07:52
Modified
2025-11-03 17:33
Severity ?
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 4a476bd6d1d923922ec950ddc4c27b279f6901eb
Version: 4a476bd6d1d923922ec950ddc4c27b279f6901eb
Version: 4a476bd6d1d923922ec950ddc4c27b279f6901eb
Version: 4a476bd6d1d923922ec950ddc4c27b279f6901eb
Version: 4a476bd6d1d923922ec950ddc4c27b279f6901eb
Version: 4a476bd6d1d923922ec950ddc4c27b279f6901eb
Version: 4a476bd6d1d923922ec950ddc4c27b279f6901eb
Version: 4a476bd6d1d923922ec950ddc4c27b279f6901eb
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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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          "url": "https://git.kernel.org/stable/c/33163c68d2e3061fa3935b5f0a1867958b1cdbd2"
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          "url": "https://git.kernel.org/stable/c/9da3e442714f7f4393ff01c265c4959c03e88c2f"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38086",
    "datePublished": "2025-06-28T07:52:58.293Z",
    "dateReserved": "2025-04-16T04:51:23.981Z",
    "dateUpdated": "2025-11-03T17:33:56.167Z",
    "state": "PUBLISHED"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2025-38086\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-06-28T08:15:24.997\",\"lastModified\":\"2025-11-03T18:16:02.013\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"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.\"},{\"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(). Sin embargo, \\\"buff\\\" se inicializa condicionalmente dentro de control_read(): if (err == size) { memcpy(data, buf, size); } Si no se cumple la condici\u00f3n \\\"err == size\\\", \\\"buff\\\" permanece sin inicializar. Una vez que esto sucede, se accede al \\\"buff\\\" no inicializado y se devuelve durante ch9200_mdio_read(): return (buff[0] | buff[1] \u0026lt;\u0026lt; 8); El problema se debe a que ch9200_mdio_read() ignora el valor de retorno de control_read(), lo que provoca un acceso uinit a \\\"buff\\\". Para solucionarlo, debemos comprobar el valor de retorno de control_read() y devolver el error antes de tiempo.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/119766de4930ff40db9f36b960cb53b0c400e81b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/33163c68d2e3061fa3935b5f0a1867958b1cdbd2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4da7fcc098218ff92b2e83a43f545c02f714cedd\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6bd2569d0b2f918e9581f744df0263caf73ee76c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9a350f30d65197354706b7759b5c89d6c267b1a9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9ad0452c0277b816a435433cca601304cfac7c21\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9da3e442714f7f4393ff01c265c4959c03e88c2f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cdaa6d1cb2ff1219c6c822b27655dd170ffb0f72\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"}]}}"
  }
}


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