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CVE-2025-38509

Estado: AnalizadaMedia (5.5)—

In the Linux kernel, the following vulnerability has been resolved:

wifi: mac80211: reject VHT opmode for unsupported channel widths

VHT operating mode notifications are not defined for channel widths below 20 MHz. In particular, 5 MHz and 10 MHz are not valid under the VHT specification and must be rejected.

Without this check, malformed notifications using these widths may reach ieee80211_chan_width_to_rx_bw(), leading to a WARN_ON due to invalid input. This issue was reported by syzbot.

Reject these unsupported widths early in sta_link_apply_parameters() when opmode_notif is used. The accepted set includes 20, 40, 80, 160, and 80+80 MHz, which are valid for VHT.

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While 320 MHz is not defined for VHT, it is allowed to avoid rejecting HE or EHT clients that may still send a VHT opmode notification.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2025-38509",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 5.5,
          "attackVector": "LOCAL",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 1.8
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          "vendor": "Linux",
          "product": "Linux",
          "versions": [
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          "programFiles": [
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          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
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              "status": "affected",
              "version": "6.13"
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            {
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              "version": "0",
              "lessThan": "6.13",
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              "version": "6.15.7",
              "versionType": "semver",
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            {
              "status": "unaffected",
              "version": "6.16",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
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          ],
          "programFiles": [
            "net/mac80211/cfg.c"
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          "defaultStatus": "affected"
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  ],
  "published": "2025-08-16T11:15:43.893",
  "references": [
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      "url": "https://git.kernel.org/stable/c/18eca59a04500b68a90e0c5c873f97c9d1ea2bfa",
      "tags": [
        "Patch"
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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      "url": "https://git.kernel.org/stable/c/58fcb1b4287ce38850402bb2bb16d09bf77b91d9",
      "tags": [
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
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          "lang": "en",
          "value": "NVD-CWE-noinfo"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mac80211: reject VHT opmode for unsupported channel widths\n\nVHT operating mode notifications are not defined for channel widths\nbelow 20 MHz. In particular, 5 MHz and 10 MHz are not valid under the\nVHT specification and must be rejected.\n\nWithout this check, malformed notifications using these widths may\nreach ieee80211_chan_width_to_rx_bw(), leading to a WARN_ON due to\ninvalid input. This issue was reported by syzbot.\n\nReject these unsupported widths early in sta_link_apply_parameters()\nwhen opmode_notif is used. The accepted set includes 20, 40, 80, 160,\nand 80+80 MHz, which are valid for VHT. While 320 MHz is not defined\nfor VHT, it is allowed to avoid rejecting HE or EHT clients that may\nstill send a VHT opmode notification."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: wifi: mac80211: rechazar el modo de operación VHT para anchos de canal no compatibles. Las notificaciones del modo de operación VHT no están definidas para anchos de canal inferiores a 20 MHz. En particular, 5 MHz y 10 MHz no son válidos según la especificación VHT y deben rechazarse. Sin esta comprobación, las notificaciones malformadas que utilicen estos anchos pueden alcanzar ieee80211_chan_width_to_rx_bw(), lo que genera un WARN_ON debido a una entrada no válida. Este problema fue reportado por syzbot. Rechace estos anchos no compatibles al principio de sta_link_apply_parameters() cuando se utilice opmode_notif. El conjunto aceptado incluye 20, 40, 80, 160 y 80+80 MHz, que son válidos para VHT. Si bien 320 MHz no está definido para VHT, se permite evitar rechazar clientes HE o EHT que aún puedan enviar una notificación de modo de operación VHT."
    }
  ],
  "lastModified": "2026-06-17T09:17:00.790",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
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              "versionEndExcluding": "6.15.7",
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          "operator": "OR"
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}