fkie_cve-2025-21704
Vulnerability from fkie_nvd
Published
2025-02-22 10:15
Modified
2025-11-03 20:17
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: usb: cdc-acm: Check control transfer buffer size before access If the first fragment is shorter than struct usb_cdc_notification, we can't calculate an expected_size. Log an error and discard the notification instead of reading lengths from memory outside the received data, which can lead to memory corruption when the expected_size decreases between fragments, causing `expected_size - acm->nb_index` to wrap. This issue has been present since the beginning of git history; however, it only leads to memory corruption since commit ea2583529cd1 ("cdc-acm: reassemble fragmented notifications"). A mitigating factor is that acm_ctrl_irq() can only execute after userspace has opened /dev/ttyACM*; but if ModemManager is running, ModemManager will do that automatically depending on the USB device's vendor/product IDs and its other interfaces.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/383d516a0ebc8641372b521c8cb717f0f1834831Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6abb510251e75f875797d8983a830e6731fa281cPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7828e9363ac4d23b02419bf2a45b9f1d9fb35646Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/871619c2b78fdfe05afb4e8ba548678687beb812Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/90dd2f1b7342b9a671a5ea4160f408037b92b118Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a4e1ae5c0533964170197e4fb4f33bc8c1db5cd2Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e563b01208f4d1f609bcab13333b6c0e24ce6a01Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f64079bef6a8a7823358c3f352ea29a617844636Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://project-zero.issues.chromium.org/issues/395107243Exploit, Issue Tracking, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html
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 *
linux linux_kernel 2.6.12
linux linux_kernel 2.6.12
linux linux_kernel 2.6.12
linux linux_kernel 2.6.12
linux linux_kernel 2.6.12
linux linux_kernel 6.14
linux linux_kernel 6.14


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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: cdc-acm: Check control transfer buffer size before access\n\nIf the first fragment is shorter than struct usb_cdc_notification, we can\u0027t\ncalculate an expected_size. Log an error and discard the notification\ninstead of reading lengths from memory outside the received data, which can\nlead to memory corruption when the expected_size decreases between\nfragments, causing `expected_size - acm-\u003enb_index` to wrap.\n\nThis issue has been present since the beginning of git history; however,\nit only leads to memory corruption since commit ea2583529cd1\n(\"cdc-acm: reassemble fragmented notifications\").\n\nA mitigating factor is that acm_ctrl_irq() can only execute after userspace\nhas opened /dev/ttyACM*; but if ModemManager is running, ModemManager will\ndo that automatically depending on the USB device\u0027s vendor/product IDs and\nits other interfaces."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: usb: cdc-acm: Verificar el tama\u00f1o del b\u00fafer de transferencia de control antes del acceso Si el primer fragmento es m\u00e1s corto que struct usb_cdc_notification, no podemos calcular un expected_size. Registra un error y descarta la notificaci\u00f3n en lugar de leer longitudes de la memoria fuera de los datos recibidos, lo que puede provocar una corrupci\u00f3n de la memoria cuando el expected_size disminuye entre fragmentos, lo que hace que `expected_size - acm-\u0026gt;nb_index` se ajuste. Este problema ha estado presente desde el comienzo de la historia de git; sin embargo, solo conduce a la corrupci\u00f3n de la memoria desde el commit ea2583529cd1 (\"cdc-acm: reensamblar notificaciones fragmentadas\"). Un factor atenuante es que acm_ctrl_irq() solo se puede ejecutar despu\u00e9s de que el espacio de usuario haya abierto /dev/ttyACM*; pero si ModemManager se est\u00e1 ejecutando, ModemManager lo har\u00e1 autom\u00e1ticamente dependiendo de los ID de proveedor/producto del dispositivo USB y sus otras interfaces."
    }
  ],
  "id": "CVE-2025-21704",
  "lastModified": "2025-11-03T20:17:10.190",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2025-02-22T10:15:11.263",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
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      "url": "https://git.kernel.org/stable/c/383d516a0ebc8641372b521c8cb717f0f1834831"
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    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
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      "url": "https://git.kernel.org/stable/c/e563b01208f4d1f609bcab13333b6c0e24ce6a01"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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      "url": "https://git.kernel.org/stable/c/f64079bef6a8a7823358c3f352ea29a617844636"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
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        "Issue Tracking",
        "Third Party Advisory"
      ],
      "url": "https://project-zero.issues.chromium.org/issues/395107243"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html"
    },
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      "url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html"
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-787"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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