CVE - CVE-2025-38086

CVE-ID
CVE-2025-38086	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
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
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/119766de4930ff40db9f36b960cb53b0c400e81b URL:https://git.kernel.org/stable/c/119766de4930ff40db9f36b960cb53b0c400e81b MISC:https://git.kernel.org/stable/c/33163c68d2e3061fa3935b5f0a1867958b1cdbd2 URL:https://git.kernel.org/stable/c/33163c68d2e3061fa3935b5f0a1867958b1cdbd2 MISC:https://git.kernel.org/stable/c/4da7fcc098218ff92b2e83a43f545c02f714cedd URL:https://git.kernel.org/stable/c/4da7fcc098218ff92b2e83a43f545c02f714cedd MISC:https://git.kernel.org/stable/c/6bd2569d0b2f918e9581f744df0263caf73ee76c URL:https://git.kernel.org/stable/c/6bd2569d0b2f918e9581f744df0263caf73ee76c MISC:https://git.kernel.org/stable/c/9a350f30d65197354706b7759b5c89d6c267b1a9 URL:https://git.kernel.org/stable/c/9a350f30d65197354706b7759b5c89d6c267b1a9 MISC:https://git.kernel.org/stable/c/9ad0452c0277b816a435433cca601304cfac7c21 URL:https://git.kernel.org/stable/c/9ad0452c0277b816a435433cca601304cfac7c21 MISC:https://git.kernel.org/stable/c/9da3e442714f7f4393ff01c265c4959c03e88c2f URL:https://git.kernel.org/stable/c/9da3e442714f7f4393ff01c265c4959c03e88c2f MISC:https://git.kernel.org/stable/c/cdaa6d1cb2ff1219c6c822b27655dd170ffb0f72 URL:https://git.kernel.org/stable/c/cdaa6d1cb2ff1219c6c822b27655dd170ffb0f72
Assigning CNA
kernel.org
Date Record Created
20250416	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20250416)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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