CVE-2026-53252 (GCVE-0-2026-53252)
Vulnerability from cvelistv5
Published
2026-06-25 08:39
Modified
2026-06-25 08:39
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: fix memory leak in error path of hci_alloc_dev() Early failures in Bluetooth HCI UART configuration leak SRCU percpu memory. When device initialization fails before hci_register_dev() completes, the HCI_UNREGISTER flag is never set. As a result, when the device reference count reaches zero, bt_host_release() evaluates this flag as false and falls back to a direct kfree(hdev). Because hci_release_dev() is bypassed, the SRCU struct initialized early in hci_alloc_dev() is never cleaned up, resulting in a leak of percpu memory. Fix the leak by explicitly calling cleanup_srcu_struct() in the fallback (unregistered) branch of bt_host_release() before freeing the device.
References
Impacted products
Vendor Product Version
Linux Linux Version: 90dee0a0ff84fac8accd5be98412b3819f667149
Version: c56b177efce8b62798e4d96bdb9867106cb7c4a0
Version: bc0819a25e04cd68ef3568cfa51b63118fea39a7
Version: ce23b73f0f27e2dbeb81734a79db710f05aa33c6
Version: 1d6123102e9fbedc8d25bf4731da6d513173e49e
Version: 1d6123102e9fbedc8d25bf4731da6d513173e49e
Version: 1d6123102e9fbedc8d25bf4731da6d513173e49e
Version: dd4becd3fd4102696e1c15e6d260a1712a2d8685
Version: 0e5c144c557df910ab64d9c25d06399a9a735e65
Version: 5.15.209   ≤
Version: 6.1.167   ≤
Version: 6.6.97   ≤
Version: 6.12.36   ≤
Version: 5.10.259   ≤
Version: 6.15.5   ≤
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{
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: fix memory leak in error path of hci_alloc_dev()\n\nEarly failures in Bluetooth HCI UART configuration leak SRCU percpu\nmemory.\n\nWhen device initialization fails before hci_register_dev() completes,\nthe HCI_UNREGISTER flag is never set. As a result, when the device\nreference count reaches zero, bt_host_release() evaluates this flag as\nfalse and falls back to a direct kfree(hdev).\n\nBecause hci_release_dev() is bypassed, the SRCU struct initialized\nearly in hci_alloc_dev() is never cleaned up, resulting in a leak of\npercpu memory.\n\nFix the leak by explicitly calling cleanup_srcu_struct() in the\nfallback (unregistered) branch of bt_host_release() before freeing\nthe device."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-25T08:39:43.951Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/5b7dfca6f852e6b9d809fd0263b5427cc9fb33fd"
        },
        {
          "url": "https://git.kernel.org/stable/c/c016118b9e51eeaf5bc93850d4c455a3b583c0aa"
        },
        {
          "url": "https://git.kernel.org/stable/c/0622e527a31d4b44737fed5c1a2ac1fc2cfb5184"
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        {
          "url": "https://git.kernel.org/stable/c/bc2efe73c194a74839d7cf57b63880d97e21d309"
        },
        {
          "url": "https://git.kernel.org/stable/c/ce4b4cac3c5749b6aa75e62e2991ae2263f2f889"
        },
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          "url": "https://git.kernel.org/stable/c/f82799407a50af7bcacacf09cc9b279af8fe9b81"
        },
        {
          "url": "https://git.kernel.org/stable/c/37b3009bf5976e8ab77c8b9a9bc3bbd7ff49e37f"
        }
      ],
      "title": "Bluetooth: fix memory leak in error path of hci_alloc_dev()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-53252",
    "datePublished": "2026-06-25T08:39:43.951Z",
    "dateReserved": "2026-06-09T07:44:35.394Z",
    "dateUpdated": "2026-06-25T08:39:43.951Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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