FKIE_CVE-2025-40071

Vulnerability from fkie_nvd - Published: 2025-10-28 12:15 - Updated: 2026-10-30 13:18
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: tty: n_gsm: Don't block input queue by waiting MSC Currently gsm_queue() processes incoming frames and when opening a DLC channel it calls gsm_dlci_open() which calls gsm_modem_update(). If basic mode is used it calls gsm_modem_upd_via_msc() and it cannot block the input queue by waiting the response to come into the same input queue. Instead allow sending Modem Status Command without waiting for remote end to respond. Define a new function gsm_modem_send_initial_msc() for this purpose. As MSC is only valid for basic encoding, it does not do anything for advanced or when convergence layer type 2 is used.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3cf0b3c243e56bc43be560617416c1d9f301f44c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5416e89b81b00443cb03c88df8da097ae091a141
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8fcc22d6b90304d8b7436e101562218ea3faf73b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c36785f9de03df56ff9b8eca30fa681a12b2310d
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c5a2791a7f11939f05f95c01f0aec0c55bbf28d5
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/tty/n_gsm.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "8fcc22d6b90304d8b7436e101562218ea3faf73b",
              "status": "affected",
              "version": "48473802506d2d6151f59e0e764932b33b53cb3b",
              "versionType": "git"
            },
            {
              "lessThan": "c36785f9de03df56ff9b8eca30fa681a12b2310d",
              "status": "affected",
              "version": "48473802506d2d6151f59e0e764932b33b53cb3b",
              "versionType": "git"
            },
            {
              "lessThan": "5416e89b81b00443cb03c88df8da097ae091a141",
              "status": "affected",
              "version": "48473802506d2d6151f59e0e764932b33b53cb3b",
              "versionType": "git"
            },
            {
              "lessThan": "c5a2791a7f11939f05f95c01f0aec0c55bbf28d5",
              "status": "affected",
              "version": "48473802506d2d6151f59e0e764932b33b53cb3b",
              "versionType": "git"
            },
            {
              "lessThan": "3cf0b3c243e56bc43be560617416c1d9f301f44c",
              "status": "affected",
              "version": "48473802506d2d6151f59e0e764932b33b53cb3b",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "920e849b7d23ced84c9d11e11e2449e34973cfb8",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "e83b4e1540469babeffcfd44a605cf8a61542598",
              "versionType": "git"
            },
            {
              "lessThan": "5.16",
              "status": "affected",
              "version": "5.15.54",
              "versionType": "semver"
            },
            {
              "lessThan": "5.18",
              "status": "affected",
              "version": "5.17.6",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/tty/n_gsm.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.18"
            },
            {
              "lessThan": "5.18",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.191",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.112",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.53",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.17.*",
              "status": "unaffected",
              "version": "6.17.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.18",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntty: n_gsm: Don\u0027t block input queue by waiting MSC\n\nCurrently gsm_queue() processes incoming frames and when opening\na DLC channel it calls gsm_dlci_open() which calls gsm_modem_update().\nIf basic mode is used it calls gsm_modem_upd_via_msc() and it\ncannot block the input queue by waiting the response to come\ninto the same input queue.\n\nInstead allow sending Modem Status Command without waiting for remote\nend to respond. Define a new function gsm_modem_send_initial_msc()\nfor this purpose. As MSC is only valid for basic encoding, it does\nnot do anything for advanced or when convergence layer type 2 is used."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ntty: n_gsm: No bloquear la cola de entrada al esperar MSC\n\nActualmente, gsm_queue() procesa las tramas entrantes y al abrir un canal DLC llama a gsm_dlci_open(), que a su vez llama a gsm_modem_update(). Si se utiliza el modo b\u00e1sico, llama a gsm_modem_upd_via_msc() y no puede bloquear la cola de entrada al esperar que la respuesta llegue a la misma cola de entrada.\n\nEn su lugar, permitir el env\u00edo del Comando de Estado del M\u00f3dem sin esperar a que el extremo remoto responda. Definir una nueva funci\u00f3n gsm_modem_send_initial_msc() para este prop\u00f3sito. Como MSC solo es v\u00e1lido para la codificaci\u00f3n b\u00e1sica, no hace nada para avanzado o cuando se utiliza la capa de convergencia tipo 2."
    }
  ],
  "id": "CVE-2025-40071",
  "lastModified": "2026-10-30T13:18:13.077",
  "metrics": {},
  "published": "2025-10-28T12:15:41.613",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/3cf0b3c243e56bc43be560617416c1d9f301f44c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/5416e89b81b00443cb03c88df8da097ae091a141"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/8fcc22d6b90304d8b7436e101562218ea3faf73b"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/c36785f9de03df56ff9b8eca30fa681a12b2310d"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/c5a2791a7f11939f05f95c01f0aec0c55bbf28d5"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Deferred"
}



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