CVE-2025-68298 (GCVE-0-2025-68298)
Vulnerability from cvelistv5
Published
2025-12-16 15:06
Modified
2025-12-16 15:06
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: btusb: mediatek: Avoid btusb_mtk_claim_iso_intf() NULL deref In btusb_mtk_setup(), we set `btmtk_data->isopkt_intf` to: usb_ifnum_to_if(data->udev, MTK_ISO_IFNUM) That function can return NULL in some cases. Even when it returns NULL, though, we still go on to call btusb_mtk_claim_iso_intf(). As of commit e9087e828827 ("Bluetooth: btusb: mediatek: Add locks for usb_driver_claim_interface()"), calling btusb_mtk_claim_iso_intf() when `btmtk_data->isopkt_intf` is NULL will cause a crash because we'll end up passing a bad pointer to device_lock(). Prior to that commit we'd pass the NULL pointer directly to usb_driver_claim_interface() which would detect it and return an error, which was handled. Resolve the crash in btusb_mtk_claim_iso_intf() by adding a NULL check at the start of the function. This makes the code handle a NULL `btmtk_data->isopkt_intf` the same way it did before the problematic commit (just with a slight change to the error message printed).
References
Impacted products
Vendor Product Version
Linux Linux Version: 930e1790b99e5839e1af69d2f7fd808f1fba2df9
Version: e9087e828827e5a5c85e124ce77503f2b81c3491
Version: e9087e828827e5a5c85e124ce77503f2b81c3491
Version: 4194766ec8756f4f654d595ae49962acbac49490
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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/bluetooth/btusb.c"
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          "vendor": "Linux",
          "versions": [
            {
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              "version": "6.14"
            },
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              "lessThan": "6.14",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.61",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "6.17.*",
              "status": "unaffected",
              "version": "6.17.11",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.18",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: btusb: mediatek: Avoid btusb_mtk_claim_iso_intf() NULL deref\n\nIn btusb_mtk_setup(), we set `btmtk_data-\u003eisopkt_intf` to:\n  usb_ifnum_to_if(data-\u003eudev, MTK_ISO_IFNUM)\n\nThat function can return NULL in some cases. Even when it returns\nNULL, though, we still go on to call btusb_mtk_claim_iso_intf().\n\nAs of commit e9087e828827 (\"Bluetooth: btusb: mediatek: Add locks for\nusb_driver_claim_interface()\"), calling btusb_mtk_claim_iso_intf()\nwhen `btmtk_data-\u003eisopkt_intf` is NULL will cause a crash because\nwe\u0027ll end up passing a bad pointer to device_lock(). Prior to that\ncommit we\u0027d pass the NULL pointer directly to\nusb_driver_claim_interface() which would detect it and return an\nerror, which was handled.\n\nResolve the crash in btusb_mtk_claim_iso_intf() by adding a NULL check\nat the start of the function. This makes the code handle a NULL\n`btmtk_data-\u003eisopkt_intf` the same way it did before the problematic\ncommit (just with a slight change to the error message printed)."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-16T15:06:17.526Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/2fa09fe98ca3b114d66285f65f7e108fea131815"
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        {
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        },
        {
          "url": "https://git.kernel.org/stable/c/c884a0b27b4586e607431d86a1aa0bb4fb39169c"
        }
      ],
      "title": "Bluetooth: btusb: mediatek: Avoid btusb_mtk_claim_iso_intf() NULL deref",
      "x_generator": {
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      }
    }
  },
  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-68298",
    "datePublished": "2025-12-16T15:06:17.526Z",
    "dateReserved": "2025-12-16T14:48:05.293Z",
    "dateUpdated": "2025-12-16T15:06:17.526Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-68298\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-12-16T16:16:08.760\",\"lastModified\":\"2025-12-18T15:08:06.237\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nBluetooth: btusb: mediatek: Avoid btusb_mtk_claim_iso_intf() NULL deref\\n\\nIn btusb_mtk_setup(), we set `btmtk_data-\u003eisopkt_intf` to:\\n  usb_ifnum_to_if(data-\u003eudev, MTK_ISO_IFNUM)\\n\\nThat function can return NULL in some cases. Even when it returns\\nNULL, though, we still go on to call btusb_mtk_claim_iso_intf().\\n\\nAs of commit e9087e828827 (\\\"Bluetooth: btusb: mediatek: Add locks for\\nusb_driver_claim_interface()\\\"), calling btusb_mtk_claim_iso_intf()\\nwhen `btmtk_data-\u003eisopkt_intf` is NULL will cause a crash because\\nwe\u0027ll end up passing a bad pointer to device_lock(). Prior to that\\ncommit we\u0027d pass the NULL pointer directly to\\nusb_driver_claim_interface() which would detect it and return an\\nerror, which was handled.\\n\\nResolve the crash in btusb_mtk_claim_iso_intf() by adding a NULL check\\nat the start of the function. This makes the code handle a NULL\\n`btmtk_data-\u003eisopkt_intf` the same way it did before the problematic\\ncommit (just with a slight change to the error message printed).\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/2fa09fe98ca3b114d66285f65f7e108fea131815\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c3b990e0b23068da65f0004cd38ee31f43f36460\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c884a0b27b4586e607431d86a1aa0bb4fb39169c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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