CVE-2025-38086

Advisory lineage Upstream: 0 Downstream: 51
Analyzed
Published: 28 Jun 2025, 07:52
Last modified:11 May 2026, 21:20

Vulnerability Summary

Overall Risk (default)
low
22/100
CVSS Score
5.5 MEDIUM
v3.1 (nvd)
EPSS Score
0.11% LOW
0% probability +0.08%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

28 Jun 2025, 07:52
Published
Vulnerability first disclosed
11 May 2026, 21:20
Last Modified
Vulnerability information updated

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 Metrics

  • v3.1•MEDIUM•Score: 5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS Trends

Current EPSS score: 0.11%• Percentile: 29%

Techniques & Countermeasures

  • CWE-908•Use of Uninitialized Resource

    The product uses or accesses a resource that has not been initialized.

Affected Systems

  • debian•debian_linux

    11.0

  • linux•linux

    ≥ 4a476bd6d1d923922ec950ddc4c27b279f6901eb, < 119766de4930ff40db9f36b960cb53b0c400e81b | ≥ 4a476bd6d1d923922ec950ddc4c27b279f6901eb, < 33163c68d2e3061fa3935b5f0a1867958b1cdbd2 | ≥ 4a476bd6d1d923922ec950ddc4c27b279f6901eb, < 9da3e442714f7f4393ff01c265c4959c03e88c2f | ≥ 4a476bd6d1d923922ec950ddc4c27b279f6901eb, < 9a350f30d65197354706b7759b5c89d6c267b1a9 | ≥ 4a476bd6d1d923922ec950ddc4c27b279f6901eb, < 6bd2569d0b2f918e9581f744df0263caf73ee76c | ≥ 4a476bd6d1d923922ec950ddc4c27b279f6901eb, < 4da7fcc098218ff92b2e83a43f545c02f714cedd | ≥ 4a476bd6d1d923922ec950ddc4c27b279f6901eb, < cdaa6d1cb2ff1219c6c822b27655dd170ffb0f72 | ≥ 4a476bd6d1d923922ec950ddc4c27b279f6901eb, < 9ad0452c0277b816a435433cca601304cfac7c21 | 4.3

  • linux•linux_kernel

    ≥ 4.3.1, < 5.4.295 | ≥ 5.5, < 5.10.239 | ≥ 5.11, < 5.15.186 | ≥ 5.16, < 6.1.142 | ≥ 6.2, < 6.6.95 | ≥ 6.7, < 6.12.35 | ≥ 6.13, < 6.15.4 | 4.3 | 4.3:rc3 | 4.3:rc4 | 4.3:rc5 | 4.3:rc6 | 4.3:rc7

References (10)