CVE-2025-38086 (GCVE-0-2025-38086)

Vulnerability from cvelistv5 – Published: 2025-06-28 07:52 – Updated: 2026-05-11 21:20
VLAI
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
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
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)
Create a notification for this product.
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)
Create a notification for this product.
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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.\"},{\"lang\":\"es\",\"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(). 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Para solucionarlo, debemos comprobar el valor de retorno de control_read() y devolver el error antes de tiempo.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/net/usb/ch9200.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4a476bd6d1d923922ec950ddc4c27b279f6901eb\",\"lessThan\":\"119766de4930ff40db9f36b960cb53b0c400e81b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4a476bd6d1d923922ec950ddc4c27b279f6901eb\",\"lessThan\":\"33163c68d2e3061fa3935b5f0a1867958b1cdbd2\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4a476bd6d1d923922ec950ddc4c27b279f6901eb\",\"lessThan\":\"9da3e442714f7f4393ff01c265c4959c03e88c2f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4a476bd6d1d923922ec950ddc4c27b279f6901eb\",\"lessThan\":\"9a350f30d65197354706b7759b5c89d6c267b1a9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4a476bd6d1d923922ec950ddc4c27b279f6901eb\",\"lessThan\":\"6bd2569d0b2f918e9581f744df0263caf73ee76c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4a476bd6d1d923922ec950ddc4c27b279f6901eb\",\"lessThan\":\"4da7fcc098218ff92b2e83a43f545c02f714cedd\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4a476bd6d1d923922ec950ddc4c27b279f6901eb\",\"lessThan\":\"cdaa6d1cb2ff1219c6c822b27655dd170ffb0f72\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4a476bd6d1d923922ec950ddc4c27b279f6901eb\",\"lessThan\":\"9ad0452c0277b816a435433cca601304cfac7c21\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/net/usb/ch9200.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.3\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.3\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.4.295\",\"lessThanOrEqual\":\"5.4.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.239\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.186\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.142\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.95\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.35\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.15.4\",\"lessThanOrEqual\":\"6.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.16\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-908\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.3.1\",\"versionEndExcluding\":\"5.4.295\",\"matchCriteriaId\":\"3C90A96D-44CF-4337-B817-0D53A2744DFE\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.5\",\"versionEndExcluding\":\"5.10.239\",\"matchCriteriaId\":\"C3D14F4C-A21E-465D-A928-5CCE684E2B98\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.186\",\"matchCriteriaId\":\"D96F2C0D-0D4A-4658-AD34-D8A626EA422D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.142\",\"matchCriteriaId\":\"459B4E94-FE0E-434D-B782-95E3A5FFC6B1\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.95\",\"matchCriteriaId\":\"C5E01853-7048-4D78-9479-9AEE41AC8456\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.35\",\"matchCriteriaId\":\"E569FD34-0076-4428-BE17-EECCF867611C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.15.4\",\"matchCriteriaId\":\"DFD174C5-1AA2-4671-BDDC-1A9FCC753655\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:4.3:-:*:*:*:*:*:*\",\"matchCriteriaId\":\"5419A247-F671-44D6-9848-35264FDCD816\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:4.3:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"18441725-D231-42AA-A157-76D87E5AFB61\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:4.3:rc4:*:*:*:*:*:*\",\"matchCriteriaId\":\"5135D006-1800-4B96-A95C-7FFCA5497085\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:4.3:rc5:*:*:*:*:*:*\",\"matchCriteriaId\":\"58066E96-647A-4672-B6C6-B56CCD45DBD6\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:4.3:rc6:*:*:*:*:*:*\",\"matchCriteriaId\":\"125ECB6A-6ED3-4FBF-AD02-47A69528D1A1\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:4.3:rc7:*:*:*:*:*:*\",\"matchCriteriaId\":\"A729D0E4-EEA8-4497-B6B7-D9C83C4E9F97\"}]}]},{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"FA6FEEC2-9F11-4643-8827-749718254FED\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/119766de4930ff40db9f36b960cb53b0c400e81b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/33163c68d2e3061fa3935b5f0a1867958b1cdbd2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/4da7fcc098218ff92b2e83a43f545c02f714cedd\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/6bd2569d0b2f918e9581f744df0263caf73ee76c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/9a350f30d65197354706b7759b5c89d6c267b1a9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/9ad0452c0277b816a435433cca601304cfac7c21\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/9da3e442714f7f4393ff01c265c4959c03e88c2f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/cdaa6d1cb2ff1219c6c822b27655dd170ffb0f72\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]}]}}"
  }
}


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Tags
Taxonomy of the tags.





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.


Detection rules are retrieved from Rulezet.