VulnerabilityPublished 28 Jun 2025Updated 5 Nov 2026

CVE-2025-38086: Linux kernel · net: ch9200: fix uninitialised access during mii_nway_restart

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in cdaa6d1cb2ff1219c6c822b27655dd170ffb0f72 : update Linux kernel when convenient.

Data as of 5 Nov 2026, 21:04 UTC

Severity

Unrated

Rated by Threat Radar · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none

Exploitation: No evidence of active exploitation and no public proof of concept
Automatable: Attackers cannot reliably automate steps 1–4 of the kill chain
Technical impact: Limited control over the software or limited information exposure

CISA SSVC assessment, 2026-11-05.

Patch

Available – fixed in cdaa6d1cb2ff1219c6c822b27655dd170ffb0f72, 119766de4930ff40db9f36b960cb53b0c400e81b, 33163c68d2e3061fa3935b5f0a1867958b1cdbd2 +5

Exploitation evidence

Disclosed: evidence found.
CVE published 28 Jun 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 5 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 4a476bd6d1d923922ec950ddc4c27b279f6901eb, < cdaa6d1cb2ff1219c6c822b27655dd170ffb0f72	Fixed in cdaa6d1cb2ff1219c6c822b27655dd170ffb0f72
LinuxLinux	Affected ≥ 4a476bd6d1d923922ec950ddc4c27b279f6901eb, < 119766de4930ff40db9f36b960cb53b0c400e81b	Fixed in 119766de4930ff40db9f36b960cb53b0c400e81b
LinuxLinux	Affected ≥ 4a476bd6d1d923922ec950ddc4c27b279f6901eb, < 33163c68d2e3061fa3935b5f0a1867958b1cdbd2	Fixed in 33163c68d2e3061fa3935b5f0a1867958b1cdbd2
LinuxLinux	Affected ≥ 4a476bd6d1d923922ec950ddc4c27b279f6901eb, < 9da3e442714f7f4393ff01c265c4959c03e88c2f	Fixed in 9da3e442714f7f4393ff01c265c4959c03e88c2f
LinuxLinux	Affected ≥ 4a476bd6d1d923922ec950ddc4c27b279f6901eb, < 9ad0452c0277b816a435433cca601304cfac7c21	Fixed in 9ad0452c0277b816a435433cca601304cfac7c21
LinuxLinux	Affected ≥ 4a476bd6d1d923922ec950ddc4c27b279f6901eb, < 9a350f30d65197354706b7759b5c89d6c267b1a9	Fixed in 9a350f30d65197354706b7759b5c89d6c267b1a9

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

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