Vulnerability Database

318,756

Total vulnerabilities in the database

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.

  • Published: Jun 28, 2025
  • Updated: Dec 18, 2025
  • CVE: CVE-2025-38086
  • Severity: Medium
  • Exploit:

CVSS v3:

  • Severity: Medium
  • Score: 5.5
  • AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CWEs:

Software From Fixed in
linux / linux_kernel 4.3.1 5.4.295
linux / linux_kernel 5.5 5.10.239
linux / linux_kernel 5.11 5.15.186
linux / linux_kernel 5.16 6.1.142
linux / linux_kernel 6.2 6.6.95
linux / linux_kernel 6.7 6.12.35
linux / linux_kernel 6.13 6.15.4
linux / linux_kernel 4.3 4.3.x
linux / linux_kernel 4.3-rc3 4.3-rc3.x
linux / linux_kernel 4.3-rc4 4.3-rc4.x
linux / linux_kernel 4.3-rc5 4.3-rc5.x
linux / linux_kernel 4.3-rc6 4.3-rc6.x
linux / linux_kernel 4.3-rc7 4.3-rc7.x
debian / debian_linux 11.0 11.0.x