CVE-2025-38086 (GCVE-0-2025-38086)
Vulnerability from cvelistv5 – Published: 2025-06-28 07:52 – Updated: 2026-11-05 20:52
VLAI
EPSS
VEX
Title
net: ch9200: fix uninitialised access during mii_nway_restart
Summary
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.
Severity
No CVSS data available.
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-05 20:49 UTC
Assigner
References
10 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
4a476bd6d1d923922ec950ddc4c27b279f6901eb , < 119766de4930ff40db9f36b960cb53b0c400e81b
(git)
Affected: 4a476bd6d1d923922ec950ddc4c27b279f6901eb , < 33163c68d2e3061fa3935b5f0a1867958b1cdbd2 (git) Affected: 4a476bd6d1d923922ec950ddc4c27b279f6901eb , < 9da3e442714f7f4393ff01c265c4959c03e88c2f (git) Affected: 4a476bd6d1d923922ec950ddc4c27b279f6901eb , < 9a350f30d65197354706b7759b5c89d6c267b1a9 (git) Affected: 4a476bd6d1d923922ec950ddc4c27b279f6901eb , < 6bd2569d0b2f918e9581f744df0263caf73ee76c (git) Affected: 4a476bd6d1d923922ec950ddc4c27b279f6901eb , < 4da7fcc098218ff92b2e83a43f545c02f714cedd (git) Affected: 4a476bd6d1d923922ec950ddc4c27b279f6901eb , < cdaa6d1cb2ff1219c6c822b27655dd170ffb0f72 (git) Affected: 4a476bd6d1d923922ec950ddc4c27b279f6901eb , < 9ad0452c0277b816a435433cca601304cfac7c21 (git) |
guessed | |
| Linux | Linux |
Affected:
4.3
Unaffected: 0 , < 4.3 (semver) Unaffected: 5.4.295 , ≤ 5.4.* (semver) Unaffected: 5.10.239 , ≤ 5.10.* (semver) Unaffected: 5.15.186 , ≤ 5.15.* (semver) Unaffected: 6.1.142 , ≤ 6.1.* (semver) Unaffected: 6.6.95 , ≤ 6.6.* (semver) Unaffected: 6.12.35 , ≤ 6.12.* (semver) Unaffected: 6.15.4 , ≤ 6.15.* (semver) Unaffected: 6.16 , ≤ * (original_commit_for_fix) |
guessed |
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"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: ch9200: correcci\u00f3n del acceso no inicializado durante mii_nway_restart. En mii_nway_restart(), el c\u00f3digo intenta llamar a mii-\u0026gt;mdio_read, que es ch9200_mdio_read(). ch9200_mdio_read() utiliza un b\u00fafer local llamado \"buff\", que se inicializa con control_read(). Sin embargo, \"buff\" se inicializa condicionalmente dentro de control_read(): if (err == size) { memcpy(data, buf, size); } Si no se cumple la condici\u00f3n \"err == size\", \"buff\" permanece sin inicializar. Una vez que esto sucede, se accede al \"buff\" no inicializado y se devuelve durante ch9200_mdio_read(): return (buff[0] | buff[1] \u0026lt;\u0026lt; 8); El problema se debe a que ch9200_mdio_read() ignora el valor de retorno de control_read(), lo que provoca un acceso uinit a \"buff\". Para solucionarlo, debemos comprobar el valor de retorno de control_read() y devolver el error antes de tiempo."
}
],
"id": "CVE-2025-38086",
"lastModified": "2026-11-05T21:18:09.203",
"metrics": {
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{
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"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
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},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
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],
"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
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],
"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Analyzed",
"weaknesses": [
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"description": [
{
"lang": "en",
"value": "CWE-908"
}
],
"source": "nvd@nist.gov",
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},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-11-05T14:40:04+00:00",
"cve": "CVE-2025-38086",
"id": "CVE-2025-38086",
"initial_release_date": "2025-06-28T00:00:00+00:00",
"product_status:fixed": "1699",
"product_status:known_affected": "22",
"product_status:known_not_affected": "42",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: net: ch9200: fix uninitialised access during mii_nway_restart",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-38086.json",
"version": "3"
},
"vulnrichment": {
"containers": {
"adp": [
{
"providerMetadata": {
"dateUpdated": "2025-11-03T17:33:56.167Z",
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
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},
{
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}
],
"title": "CVE Program Container"
},
{
"metrics": [
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"other": {
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"id": "CVE-2025-38086",
"options": [
{
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},
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},
{
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}
],
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"timestamp": "2026-11-05T20:49:18.243571Z",
"version": "2.0.3"
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"dateUpdated": "2026-11-05T20:49:19.363Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
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"product": "Linux",
"programFiles": [
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],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
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{
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],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
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},
{
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"status": "unaffected",
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},
{
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},
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{
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{
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"descriptions": [
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"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ch9200: fix uninitialised access during mii_nway_restart\n\nIn mii_nway_restart() the code attempts to call\nmii-\u003emdio_read which is ch9200_mdio_read(). ch9200_mdio_read()\nutilises a local buffer called \"buff\", which is initialised\nwith control_read(). However \"buff\" is conditionally\ninitialised inside control_read():\n\n if (err == size) {\n memcpy(data, buf, size);\n }\n\nIf the condition of \"err == size\" is not met, then\n\"buff\" remains uninitialised. Once this happens the\nuninitialised \"buff\" is accessed and returned during\nch9200_mdio_read():\n\n return (buff[0] | buff[1] \u003c\u003c 8);\n\nThe problem stems from the fact that ch9200_mdio_read()\nignores the return value of control_read(), leading to\nuinit-access of \"buff\".\n\nTo fix this we should check the return value of\ncontrol_read() and return early on error."
}
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"title": "net: ch9200: fix uninitialised access during mii_nway_restart",
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"cveId": "CVE-2025-38086",
"datePublished": "2025-06-28T07:52:58.293Z",
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"state": "PUBLISHED"
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}
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
How durations are calculated
Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.
Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.