CVE-2025-38086
net: ch9200: fix uninitialised access during mii_nway_restart
We use these services and cookies to improve your user experience. You may opt out if you wish, however, this may limit some features on this site.
Please see our statement on Data Privacy.
net: ch9200: fix uninitialised access during mii_nway_restart
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.
Reserved 2025-04-16 | Published 2025-06-28 | Updated 2025-06-28 | Assigner Linuxgit.kernel.org/...c/119766de4930ff40db9f36b960cb53b0c400e81b
git.kernel.org/...c/33163c68d2e3061fa3935b5f0a1867958b1cdbd2
git.kernel.org/...c/9da3e442714f7f4393ff01c265c4959c03e88c2f
git.kernel.org/...c/9a350f30d65197354706b7759b5c89d6c267b1a9
git.kernel.org/...c/6bd2569d0b2f918e9581f744df0263caf73ee76c
git.kernel.org/...c/4da7fcc098218ff92b2e83a43f545c02f714cedd
git.kernel.org/...c/cdaa6d1cb2ff1219c6c822b27655dd170ffb0f72
git.kernel.org/...c/9ad0452c0277b816a435433cca601304cfac7c21
Support options
