CVE-2025-38086

MEDIUM EPSS 4.9%
Published Jun 28, 20251y ago · Modified Jun 17, 20262w ago
5.5 CVSS 3.1
Medium
Find Similar
Published Jun 28, 2025 1y ago
Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
4.9% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-908

Affected Products 14

VendorProductVersionRange
linuxlinux_kernel*≥4.3.1  –  <5.4.295
linuxlinux_kernel*≥5.5  –  <5.10.239
linuxlinux_kernel*≥5.11  –  <5.15.186
linuxlinux_kernel*≥5.16  –  <6.1.142
linuxlinux_kernel*≥6.2  –  <6.6.95
linuxlinux_kernel*≥6.7  –  <6.12.35
linuxlinux_kernel*≥6.13  –  <6.15.4
linuxlinux_kernel4.3any
linuxlinux_kernel4.3any
linuxlinux_kernel4.3any
linuxlinux_kernel4.3any
linuxlinux_kernel4.3any
linuxlinux_kernel4.3any
debiandebian_linux11.0any

References 10

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

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/119766de4930ff40db9f36b960cb53b0c400e81b
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/33163c68d2e3061fa3935b5f0a1867958b1cdbd2
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/4da7fcc098218ff92b2e83a43f545c02f714cedd
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/6bd2569d0b2f918e9581f744df0263caf73ee76c
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/9a350f30d65197354706b7759b5c89d6c267b1a9
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/9ad0452c0277b816a435433cca601304cfac7c21
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/9da3e442714f7f4393ff01c265c4959c03e88c2f
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/cdaa6d1cb2ff1219c6c822b27655dd170ffb0f72
    Patch