Bluetooth: hci_event: call disconnect callback before deleting conn

{
  "id": "7ce76d9754cb1ef622440daa5b80fcc2e1f05d35d05496a369948f6af5780133",
  "url": "https://osv.dev/vulnerability/CVE-2023-53673",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Bluetooth: hci_event: call disconnect callback before deleting conn",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_event: call disconnect callback before deleting conn In hci_cs_disconnect, we do hci_conn_del even if disconnection failed. ISO, L2CAP and SCO connections refer to the hci_conn without hci_conn_get, so disconn_cfm must be called so they can clean up their conn, otherwise use-after-free occurs. ISO: ========================================================== iso_sock_connect:880: sk 00000000eabd6557 iso_connect_cis:356: 70:1a:b8:98:ff:a2 -> 28:3d:c2:4a:7e:da ... iso_conn_add:140: hcon 000000001696f1fd conn 00000000b6251073 hci_dev_put:1487: hci0 orig refcnt 17 __iso_chan_add:214: conn 00000000b6251073 iso_sock_clear_timer:117: sock 00000000eabd6557 state 3 ... hci_rx_work:4085: hci0 Event packet hci_event_packet:7601: hci0: event 0x0f hci_cmd_status_evt:4346: hci0: opcode 0x0406 hci_cs_disconnect:2760: hci0: status 0x0c hci_sent_cmd_data:3107: hci0 opcode 0x0406 hci_conn_del:1151: hci0 hcon 000000001696f1fd handle 2560 hci_conn_unlink:1102: hci0: hcon 000000001696f1fd hci_conn_drop:1451: hcon 00000000d8521aaf orig refcnt 2 hci_chan_list_flush:2780: hcon 000000001696f1fd hci_dev_put:1487: hci0 orig refcnt 21 hci_dev_put:1487: hci0 orig refcnt 20 hci_req_cmd_complete:3978: opcode 0x0406 status 0x0c ... ... iso_sock_sendmsg:1098: sock 00000000dea5e2e0, sk 00000000eabd6557 BUG: kernel NULL pointer dereference, address: 0000000000000668 PGD 0 P4D 0 Oops: 0000 [#1] PREEMPT SMP PTI Hardware name: QEMU S",
    "evidence": "osv:CVE-2023-53673",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.15.200",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.42",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.4.7",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2023-53673",
      "aliases": [
        "CVE-2023-53673"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "b8d290525e3972b5e876b2649a42bf4081d753fe"
                },
                {
                  "fixed": "1ecf6dc2676ead4b927c50b1be0851fa4d756574"
                },
                {
                  "fixed": "59bd1e476bbc7bc6dff3c61bba787095a4839796"
                },
                {
                  "fixed": "093a07052406b363b1b2ab489e17dbadaf3e509b"
                },
                {
                  "fixed": "7f7cfcb6f0825652973b780f248603e23f16ee90"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-53673.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.7.0"
                },
                {
                  "fixed": "5.15.200"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.16.0"
                },
                {
                  "fixed": "6.1.42"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.2.0"
                },
                {
                  "fixed": "6.4.7"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-53673.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:53.335849038Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/093a07052406b363b1b2ab489e17dbadaf3e509b",
        "https://git.kernel.org/stable/c/1ecf6dc2676ead4b927c50b1be0851fa4d756574",
        "https://git.kernel.org/stable/c/59bd1e476bbc7bc6dff3c61bba787095a4839796",
        "https://git.kernel.org/stable/c/7f7cfcb6f0825652973b780f248603e23f16ee90",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53673.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2023-53673",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53673.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2023-53673",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 521986,
  "published_at": "2025-10-07T15:21:29.632+00:00"
}