CVE-2025-38086

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2025-38086
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.

5.5 /10

CVSS v3 : MEDIUM

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://git.kernel.org/stable/c/119766de4930ff40db9f36b960cb53b0c400e81b Patch
https://git.kernel.org/stable/c/33163c68d2e3061fa3935b5f0a1867958b1cdbd2 Patch
https://git.kernel.org/stable/c/4da7fcc098218ff92b2e83a43f545c02f714cedd Patch
https://git.kernel.org/stable/c/6bd2569d0b2f918e9581f744df0263caf73ee76c Patch
https://git.kernel.org/stable/c/9a350f30d65197354706b7759b5c89d6c267b1a9 Patch
https://git.kernel.org/stable/c/9ad0452c0277b816a435433cca601304cfac7c21 Patch
https://git.kernel.org/stable/c/9da3e442714f7f4393ff01c265c4959c03e88c2f Patch
https://git.kernel.org/stable/c/cdaa6d1cb2ff1219c6c822b27655dd170ffb0f72 Patch
https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html Third Party Advisory
https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html Third Party Advisory
Configurations

Configuration 1 (hide)

OR cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:4.3:-:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:4.3:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:4.3:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:4.3:rc5:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:4.3:rc6:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:4.3:rc7:*:*:*:*:*:*

Configuration 2 (hide)

cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*
History

17 Dec 2025, 16:36

Type Values Removed Values Added
CPE cpe:2.3:o:linux:linux_kernel:4.3:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:4.3:-:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:4.3:rc3:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:4.3:rc5:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:4.3:rc7:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:4.3:rc6:*:*:*:*:*:*
First Time Linux
Debian
Debian debian Linux
Linux linux Kernel
References () https://git.kernel.org/stable/c/119766de4930ff40db9f36b960cb53b0c400e81b - () https://git.kernel.org/stable/c/119766de4930ff40db9f36b960cb53b0c400e81b - Patch
References () https://git.kernel.org/stable/c/33163c68d2e3061fa3935b5f0a1867958b1cdbd2 - () https://git.kernel.org/stable/c/33163c68d2e3061fa3935b5f0a1867958b1cdbd2 - Patch
References () https://git.kernel.org/stable/c/4da7fcc098218ff92b2e83a43f545c02f714cedd - () https://git.kernel.org/stable/c/4da7fcc098218ff92b2e83a43f545c02f714cedd - Patch
References () https://git.kernel.org/stable/c/6bd2569d0b2f918e9581f744df0263caf73ee76c - () https://git.kernel.org/stable/c/6bd2569d0b2f918e9581f744df0263caf73ee76c - Patch
References () https://git.kernel.org/stable/c/9a350f30d65197354706b7759b5c89d6c267b1a9 - () https://git.kernel.org/stable/c/9a350f30d65197354706b7759b5c89d6c267b1a9 - Patch
References () https://git.kernel.org/stable/c/9ad0452c0277b816a435433cca601304cfac7c21 - () https://git.kernel.org/stable/c/9ad0452c0277b816a435433cca601304cfac7c21 - Patch
References () https://git.kernel.org/stable/c/9da3e442714f7f4393ff01c265c4959c03e88c2f - () https://git.kernel.org/stable/c/9da3e442714f7f4393ff01c265c4959c03e88c2f - Patch
References () https://git.kernel.org/stable/c/cdaa6d1cb2ff1219c6c822b27655dd170ffb0f72 - () https://git.kernel.org/stable/c/cdaa6d1cb2ff1219c6c822b27655dd170ffb0f72 - Patch
References () https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html - () https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html - Third Party Advisory
References () https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html - () https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html - Third Party Advisory
CWE CWE-908
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 5.5

03 Nov 2025, 18:16

Type Values Removed Values Added
References
  • () https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html -
  • () https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html -

30 Jun 2025, 18:38

Type Values Removed Values Added
Summary
  • (es) En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: ch9200: corrección del acceso no inicializado durante mii_nway_restart. En mii_nway_restart(), el código intenta llamar a mii-&gt;mdio_read, que es ch9200_mdio_read(). ch9200_mdio_read() utiliza un búfer 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 condición "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] &lt;&lt; 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.

28 Jun 2025, 08:15

Type Values Removed Values Added
New CVE
Information

Published : 2025-06-28 08:15

Updated : 2025-12-17 16:36

NVD link : CVE-2025-38086

Mitre link : CVE-2025-38086

CVE.ORG link : CVE-2025-38086

JSON object : View

Products Affected

debian

  • debian_linux

linux

  • linux_kernel
CWE
CWE-908

Use of Uninitialized Resource