{"api_version":"1","generated_at":"2026-07-14T00:46:29+00:00","cve":"CVE-2026-53252","urls":{"html":"https://cve.report/CVE-2026-53252","api":"https://cve.report/api/cve/CVE-2026-53252.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-53252","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-53252"},"summary":{"title":"Bluetooth: fix memory leak in error path of hci_alloc_dev()","description":"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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-06-25 09:16:43","updated_at":"2026-07-08 16:48:59"},"problem_types":["CWE-401"],"metrics":[{"version":"3.1","source":"nvd@nist.gov","type":"Primary","score":"5.5","severity":"MEDIUM","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","baseScore":5.5,"baseSeverity":"MEDIUM","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"}}],"references":[{"url":"https://git.kernel.org/stable/c/bc2efe73c194a74839d7cf57b63880d97e21d309","name":"https://git.kernel.org/stable/c/bc2efe73c194a74839d7cf57b63880d97e21d309","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/f82799407a50af7bcacacf09cc9b279af8fe9b81","name":"https://git.kernel.org/stable/c/f82799407a50af7bcacacf09cc9b279af8fe9b81","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ce4b4cac3c5749b6aa75e62e2991ae2263f2f889","name":"https://git.kernel.org/stable/c/ce4b4cac3c5749b6aa75e62e2991ae2263f2f889","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/37b3009bf5976e8ab77c8b9a9bc3bbd7ff49e37f","name":"https://git.kernel.org/stable/c/37b3009bf5976e8ab77c8b9a9bc3bbd7ff49e37f","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/0622e527a31d4b44737fed5c1a2ac1fc2cfb5184","name":"https://git.kernel.org/stable/c/0622e527a31d4b44737fed5c1a2ac1fc2cfb5184","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/5b7dfca6f852e6b9d809fd0263b5427cc9fb33fd","name":"https://git.kernel.org/stable/c/5b7dfca6f852e6b9d809fd0263b5427cc9fb33fd","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/c016118b9e51eeaf5bc93850d4c455a3b583c0aa","name":"https://git.kernel.org/stable/c/c016118b9e51eeaf5bc93850d4c455a3b583c0aa","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-53252","name":"CVE 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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"},{"url":"https://git.kernel.org/stable/c/bc2efe73c194a74839d7cf57b63880d97e21d309"},{"url":"https://git.kernel.org/stable/c/ce4b4cac3c5749b6aa75e62e2991ae2263f2f889"},{"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 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fix memory leak in error path of hci_alloc_dev()","CVE":"CVE-2026-53252","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"53252","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"Bluetooth: fix memory leak in error path of hci_alloc_dev()"}]}}}