CVE-2025-40071 (GCVE-0-2025-40071)
Vulnerability from cvelistv5
Published
2025-10-28 11:48
Modified
2025-10-28 11:48
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
Impacted products
Vendor Product Version
Linux Linux Version: 48473802506d2d6151f59e0e764932b33b53cb3b
Version: 48473802506d2d6151f59e0e764932b33b53cb3b
Version: 48473802506d2d6151f59e0e764932b33b53cb3b
Version: 48473802506d2d6151f59e0e764932b33b53cb3b
Version: 920e849b7d23ced84c9d11e11e2449e34973cfb8
Version: e83b4e1540469babeffcfd44a605cf8a61542598
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "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",
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "5.18"
            },
            {
              "lessThan": "5.18",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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            {
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              "status": "unaffected",
              "version": "6.6.112",
              "versionType": "semver"
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              "version": "6.12.53",
              "versionType": "semver"
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              "lessThanOrEqual": "6.17.*",
              "status": "unaffected",
              "version": "6.17.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.18-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "vulnerable": true
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                {
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                },
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                  "vulnerable": true
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              ],
              "negate": false,
              "operator": "OR"
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          ]
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      ],
      "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-10-28T11:48:39.417Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/c36785f9de03df56ff9b8eca30fa681a12b2310d"
        },
        {
          "url": "https://git.kernel.org/stable/c/5416e89b81b00443cb03c88df8da097ae091a141"
        },
        {
          "url": "https://git.kernel.org/stable/c/c5a2791a7f11939f05f95c01f0aec0c55bbf28d5"
        },
        {
          "url": "https://git.kernel.org/stable/c/3cf0b3c243e56bc43be560617416c1d9f301f44c"
        }
      ],
      "title": "tty: n_gsm: Don\u0027t block input queue by waiting MSC",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-40071",
    "datePublished": "2025-10-28T11:48:39.417Z",
    "dateReserved": "2025-04-16T07:20:57.159Z",
    "dateUpdated": "2025-10-28T11:48:39.417Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-40071\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-10-28T12:15:41.613\",\"lastModified\":\"2025-10-30T15:05:32.197\",\"vulnStatus\":\"Awaiting Analysis\",\"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.\"}],\"metrics\":{},\"references\":[{\"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/c36785f9de03df56ff9b8eca30fa681a12b2310d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c5a2791a7f11939f05f95c01f0aec0c55bbf28d5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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