IT

Tracker / CVE-2025-38086

CVE-2025-38086

Medium 5.5

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.

Affected products and versions

debian debian_linux
linux linux_kernel
linux linux_kernel · 4.3.1 → 5.4.295
linux linux_kernel · 5.11 → 5.15.186
linux linux_kernel · 5.16 → 6.1.142
linux linux_kernel · 5.5 → 5.10.239
linux linux_kernel · 6.13 → 6.15.4
linux linux_kernel · 6.2 → 6.6.95
linux linux_kernel · 6.7 → 6.12.35

Analysis

This page is not indexable yet.Until it carries original analysis — what it actually exposes, how to check in two minutes whether a system was touched, what to do if it was — the page stays noindex. The database decides that, not the template.

References