fkie_cve-2025-38086
Vulnerability from fkie_nvd
Published
2025-06-28 08:15
Modified
2025-12-17 16:36
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/119766de4930ff40db9f36b960cb53b0c400e81bPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/33163c68d2e3061fa3935b5f0a1867958b1cdbd2Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4da7fcc098218ff92b2e83a43f545c02f714ceddPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6bd2569d0b2f918e9581f744df0263caf73ee76cPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9a350f30d65197354706b7759b5c89d6c267b1a9Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9ad0452c0277b816a435433cca601304cfac7c21Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9da3e442714f7f4393ff01c265c4959c03e88c2fPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cdaa6d1cb2ff1219c6c822b27655dd170ffb0f72Patch
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2025/10/msg00007.htmlThird Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2025/10/msg00008.htmlThird Party Advisory
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 4.3
linux linux_kernel 4.3
linux linux_kernel 4.3
linux linux_kernel 4.3
linux linux_kernel 4.3
linux linux_kernel 4.3
debian debian_linux 11.0


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  "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."
    }
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  "id": "CVE-2025-38086",
  "lastModified": "2025-12-17T16:36:11.670",
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          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
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        "impactScore": 3.6,
        "source": "nvd@nist.gov",
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  "published": "2025-06-28T08:15:24.997",
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      "source": "nvd@nist.gov",
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}


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