CVE-2025-21704 (GCVE-0-2025-21704)
Vulnerability from cvelistv5
Published
2025-02-22 09:43
Modified
2025-05-04 07:19
Severity ?
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
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/usb/class/cdc-acm.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
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              "versionType": "git"
            },
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              "status": "affected",
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              "versionType": "git"
            },
            {
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              "status": "affected",
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              "versionType": "git"
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            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/usb/class/cdc-acm.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.12"
            },
            {
              "lessThan": "2.6.12",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.291",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.235",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.179",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.129",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.79",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.16",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.13.*",
              "status": "unaffected",
              "version": "6.13.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.14",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.4.291",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
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                  "versionEndExcluding": "5.10.235",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.179",
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                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.129",
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                  "versionEndExcluding": "6.12.16",
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                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.13.4",
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                },
                {
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                  "versionEndExcluding": "6.14",
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                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-05-04T07:19:21.210Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/a4e1ae5c0533964170197e4fb4f33bc8c1db5cd2"
        },
        {
          "url": "https://git.kernel.org/stable/c/90dd2f1b7342b9a671a5ea4160f408037b92b118"
        },
        {
          "url": "https://git.kernel.org/stable/c/871619c2b78fdfe05afb4e8ba548678687beb812"
        },
        {
          "url": "https://git.kernel.org/stable/c/7828e9363ac4d23b02419bf2a45b9f1d9fb35646"
        },
        {
          "url": "https://git.kernel.org/stable/c/6abb510251e75f875797d8983a830e6731fa281c"
        },
        {
          "url": "https://git.kernel.org/stable/c/f64079bef6a8a7823358c3f352ea29a617844636"
        },
        {
          "url": "https://git.kernel.org/stable/c/383d516a0ebc8641372b521c8cb717f0f1834831"
        },
        {
          "url": "https://git.kernel.org/stable/c/e563b01208f4d1f609bcab13333b6c0e24ce6a01"
        },
        {
          "url": "https://project-zero.issues.chromium.org/issues/395107243"
        }
      ],
      "title": "usb: cdc-acm: Check control transfer buffer size before access",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-21704",
    "datePublished": "2025-02-22T09:43:37.377Z",
    "dateReserved": "2024-12-29T08:45:45.751Z",
    "dateUpdated": "2025-05-04T07:19:21.210Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-21704\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-02-22T10:15:11.263\",\"lastModified\":\"2025-03-25T13:15:40.507\",\"vulnStatus\":\"Awaiting Analysis\",\"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.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/383d516a0ebc8641372b521c8cb717f0f1834831\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6abb510251e75f875797d8983a830e6731fa281c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7828e9363ac4d23b02419bf2a45b9f1d9fb35646\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/871619c2b78fdfe05afb4e8ba548678687beb812\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/90dd2f1b7342b9a671a5ea4160f408037b92b118\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a4e1ae5c0533964170197e4fb4f33bc8c1db5cd2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e563b01208f4d1f609bcab13333b6c0e24ce6a01\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f64079bef6a8a7823358c3f352ea29a617844636\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://project-zero.issues.chromium.org/issues/395107243\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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