FKIE_CVE-2025-71127

Vulnerability from fkie_nvd - Published: 2026-01-14 15:16 - Updated: 2026-03-25 18:51
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211: Discard Beacon frames to non-broadcast address Beacon frames are required to be sent to the broadcast address, see IEEE Std 802.11-2020, 11.1.3.1 ("The Address 1 field of the Beacon .. frame shall be set to the broadcast address"). A unicast Beacon frame might be used as a targeted attack to get one of the associated STAs to do something (e.g., using CSA to move it to another channel). As such, it is better have strict filtering for this on the received side and discard all Beacon frames that are sent to an unexpected address. This is even more important for cases where beacon protection is used. The current implementation in mac80211 is correctly discarding unicast Beacon frames if the Protected Frame bit in the Frame Control field is set to 0. However, if that bit is set to 1, the logic used for checking for configured BIGTK(s) does not actually work. If the driver does not have logic for dropping unicast Beacon frames with Protected Frame bit 1, these frames would be accepted in mac80211 processing as valid Beacon frames even though they are not protected. This would allow beacon protection to be bypassed. While the logic for checking beacon protection could be extended to cover this corner case, a more generic check for discard all Beacon frames based on A1=unicast address covers this without needing additional changes. Address all these issues by dropping received Beacon frames if they are sent to a non-broadcast address.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0a59a3895f804469276d188effa511c72e752f35Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/193d18f60588e95d62e0f82b6a53893e5f2f19f8Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6e5bff40bb38741e40c33043ba0816fba5f93661Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7b240a8935d554ad36a52c2c37c32039f9afaef2Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/88aab153d1528bc559292a12fb5105ee97528e1fPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a21704df4024708be698fb3fd5830d5b113b70e0Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/be0974be5c42584e027883ac2af7dab5e950098cPatch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 5.7
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
To clipboard 

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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mac80211: Discard Beacon frames to non-broadcast address\n\nBeacon frames are required to be sent to the broadcast address, see IEEE\nStd 802.11-2020, 11.1.3.1 (\"The Address 1 field of the Beacon .. frame\nshall be set to the broadcast address\"). A unicast Beacon frame might be\nused as a targeted attack to get one of the associated STAs to do\nsomething (e.g., using CSA to move it to another channel). As such, it\nis better have strict filtering for this on the received side and\ndiscard all Beacon frames that are sent to an unexpected address.\n\nThis is even more important for cases where beacon protection is used.\nThe current implementation in mac80211 is correctly discarding unicast\nBeacon frames if the Protected Frame bit in the Frame Control field is\nset to 0. However, if that bit is set to 1, the logic used for checking\nfor configured BIGTK(s) does not actually work. If the driver does not\nhave logic for dropping unicast Beacon frames with Protected Frame bit\n1, these frames would be accepted in mac80211 processing as valid Beacon\nframes even though they are not protected. This would allow beacon\nprotection to be bypassed. While the logic for checking beacon\nprotection could be extended to cover this corner case, a more generic\ncheck for discard all Beacon frames based on A1=unicast address covers\nthis without needing additional changes.\n\nAddress all these issues by dropping received Beacon frames if they are\nsent to a non-broadcast address."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nwifi: mac80211: Descartar tramas Beacon a direcciones que no son de difusi\u00f3n\n\nLas tramas Beacon deben ser enviadas a la direcci\u00f3n de difusi\u00f3n, v\u00e9ase IEEE Std 802.11-2020, 11.1.3.1 (\u0027El campo Direcci\u00f3n 1 de la trama Beacon .. debe establecerse a la direcci\u00f3n de difusi\u00f3n\u0027). Una trama Beacon unicast podr\u00eda ser utilizada como un ataque dirigido para que una de las STA asociadas haga algo (por ejemplo, usando CSA para moverla a otro canal). Por lo tanto, es mejor tener un filtrado estricto para esto en el lado de recepci\u00f3n y descartar todas las tramas Beacon que se env\u00edan a una direcci\u00f3n inesperada.\n\nEsto es a\u00fan m\u00e1s importante para los casos en que se utiliza la protecci\u00f3n de balizas. La implementaci\u00f3n actual en mac80211 est\u00e1 descartando correctamente las tramas Beacon unicast si el bit de Trama Protegida en el campo de Control de Trama se establece en 0. Sin embargo, si ese bit se establece en 1, la l\u00f3gica utilizada para verificar los BIGTK(s) configurados no funciona realmente. Si el controlador no tiene l\u00f3gica para descartar tramas Beacon unicast con el bit de Trama Protegida en 1, estas tramas ser\u00edan aceptadas en el procesamiento de mac80211 como tramas Beacon v\u00e1lidas aunque no est\u00e9n protegidas. Esto permitir\u00eda que la protecci\u00f3n de balizas fuera eludida. Aunque la l\u00f3gica para verificar la protecci\u00f3n de balizas podr\u00eda extenderse para cubrir este caso particular, una verificaci\u00f3n m\u00e1s gen\u00e9rica para descartar todas las tramas Beacon basada en A1=direcci\u00f3n unicast cubre esto sin necesidad de cambios adicionales.\n\nAbordar todos estos problemas descartando las tramas Beacon recibidas si se env\u00edan a una direcci\u00f3n que no es de difusi\u00f3n."
    }
  ],
  "id": "CVE-2025-71127",
  "lastModified": "2026-03-25T18:51:23.393",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "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",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
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  "published": "2026-01-14T15:16:02.430",
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Analyzed",
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          "value": "NVD-CWE-noinfo"
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      "source": "nvd@nist.gov",
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}


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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
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