CVE-2023-53673 (GCVE-0-2023-53673)

Vulnerability from cvelistv5 – Published: 2025-10-07 15:21 – Updated: 2026-08-05 09:15
VLAI
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 ... <no iso_* activity on sk/conn> ... 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 Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-1.fc38 04/01/2014 RIP: 0010:iso_sock_sendmsg (net/bluetooth/iso.c:1112) bluetooth ========================================================== L2CAP: ================================================================== hci_cmd_status_evt:4359: hci0: opcode 0x0406 hci_cs_disconnect:2760: hci0: status 0x0c hci_sent_cmd_data:3085: hci0 opcode 0x0406 hci_conn_del:1151: hci0 hcon ffff88800c999000 handle 3585 hci_conn_unlink:1102: hci0: hcon ffff88800c999000 hci_chan_list_flush:2780: hcon ffff88800c999000 hci_chan_del:2761: hci0 hcon ffff88800c999000 chan ffff888018ddd280 ... BUG: KASAN: slab-use-after-free in hci_send_acl+0x2d/0x540 [bluetooth] Read of size 8 at addr ffff888018ddd298 by task bluetoothd/1175 CPU: 0 PID: 1175 Comm: bluetoothd Tainted: G E 6.4.0-rc4+ #2 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-1.fc38 04/01/2014 Call Trace: <TASK> dump_stack_lvl+0x5b/0x90 print_report+0xcf/0x670 ? __virt_addr_valid+0xf8/0x180 ? hci_send_acl+0x2d/0x540 [bluetooth] kasan_report+0xa8/0xe0 ? hci_send_acl+0x2d/0x540 [bluetooth] hci_send_acl+0x2d/0x540 [bluetooth] ? __pfx___lock_acquire+0x10/0x10 l2cap_chan_send+0x1fd/0x1300 [bluetooth] ? l2cap_sock_sendmsg+0xf2/0x170 [bluetooth] ? __pfx_l2cap_chan_send+0x10/0x10 [bluetooth] ? lock_release+0x1d5/0x3c0 ? mark_held_locks+0x1a/0x90 l2cap_sock_sendmsg+0x100/0x170 [bluetooth] sock_write_iter+0x275/0x280 ? __pfx_sock_write_iter+0x10/0x10 ? __pfx___lock_acquire+0x10/0x10 do_iter_readv_writev+0x176/0x220 ? __pfx_do_iter_readv_writev+0x10/0x10 ? find_held_lock+0x83/0xa0 ? selinux_file_permission+0x13e/0x210 do_iter_write+0xda/0x340 vfs_writev+0x1b4/0x400 ? __pfx_vfs_writev+0x10/0x10 ? __seccomp_filter+0x112/0x750 ? populate_seccomp_data+0x182/0x220 ? __fget_light+0xdf/0x100 ? do_writev+0x19d/0x210 do_writev+0x19d/0x210 ? __pfx_do_writev+0x10/0x10 ? mark_held_locks+0x1a/0x90 do_syscall_64+0x60/0x90 ? lockdep_hardirqs_on_prepare+0x149/0x210 ? do_syscall_64+0x6c/0x90 ? lockdep_hardirqs_on_prepare+0x149/0x210 entry_SYSCALL_64_after_hwframe+0x72/0xdc RIP: 0033:0x7ff45cb23e64 Code: 15 d1 1f 0d 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b8 0f 1f 00 f3 0f 1e fa 80 3d 9d a7 0d 00 00 74 13 b8 14 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 54 c3 0f 1f 00 48 83 ec 28 89 54 24 1c 48 89 RSP: 002b:00007fff21ae09b8 EFLAGS: 00000202 ORIG_RAX: 0000000000000014 RAX: ffffffffffffffda RBX: ---truncated---
Severity
8.8 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator (v2.0.3)
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: b8d290525e3972b5e876b2649a42bf4081d753fe , < 1ecf6dc2676ead4b927c50b1be0851fa4d756574 (git)
Affected: b8d290525e3972b5e876b2649a42bf4081d753fe , < 59bd1e476bbc7bc6dff3c61bba787095a4839796 (git)
Affected: b8d290525e3972b5e876b2649a42bf4081d753fe , < 093a07052406b363b1b2ab489e17dbadaf3e509b (git)
Affected: b8d290525e3972b5e876b2649a42bf4081d753fe , < 7f7cfcb6f0825652973b780f248603e23f16ee90 (git)
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Linux Linux Affected: 5.7
Unaffected: 0 , < 5.7 (semver)
Unaffected: 5.15.200 , ≤ 5.15.* (semver)
Unaffected: 6.1.42 , ≤ 6.1.* (semver)
Unaffected: 6.4.7 , ≤ 6.4.* (semver)
Unaffected: 6.5 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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                "id": "CVE-2023-53673",
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                "timestamp": "2026-06-10T20:41:12.221027Z",
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      "cpeApplicability": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_event: call disconnect callback before deleting conn\n\nIn hci_cs_disconnect, we do hci_conn_del even if disconnection failed.\n\nISO, L2CAP and SCO connections refer to the hci_conn without\nhci_conn_get, so disconn_cfm must be called so they can clean up their\nconn, otherwise use-after-free occurs.\n\nISO:\n==========================================================\niso_sock_connect:880: sk 00000000eabd6557\niso_connect_cis:356: 70:1a:b8:98:ff:a2 -\u003e 28:3d:c2:4a:7e:da\n...\niso_conn_add:140: hcon 000000001696f1fd conn 00000000b6251073\nhci_dev_put:1487: hci0 orig refcnt 17\n__iso_chan_add:214: conn 00000000b6251073\niso_sock_clear_timer:117: sock 00000000eabd6557 state 3\n...\nhci_rx_work:4085: hci0 Event packet\nhci_event_packet:7601: hci0: event 0x0f\nhci_cmd_status_evt:4346: hci0: opcode 0x0406\nhci_cs_disconnect:2760: hci0: status 0x0c\nhci_sent_cmd_data:3107: hci0 opcode 0x0406\nhci_conn_del:1151: hci0 hcon 000000001696f1fd handle 2560\nhci_conn_unlink:1102: hci0: hcon 000000001696f1fd\nhci_conn_drop:1451: hcon 00000000d8521aaf orig refcnt 2\nhci_chan_list_flush:2780: hcon 000000001696f1fd\nhci_dev_put:1487: hci0 orig refcnt 21\nhci_dev_put:1487: hci0 orig refcnt 20\nhci_req_cmd_complete:3978: opcode 0x0406 status 0x0c\n... \u003cno iso_* activity on sk/conn\u003e ...\niso_sock_sendmsg:1098: sock 00000000dea5e2e0, sk 00000000eabd6557\nBUG: kernel NULL pointer dereference, address: 0000000000000668\nPGD 0 P4D 0\nOops: 0000 [#1] PREEMPT SMP PTI\nHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-1.fc38 04/01/2014\nRIP: 0010:iso_sock_sendmsg (net/bluetooth/iso.c:1112) bluetooth\n==========================================================\n\nL2CAP:\n==================================================================\nhci_cmd_status_evt:4359: hci0: opcode 0x0406\nhci_cs_disconnect:2760: hci0: status 0x0c\nhci_sent_cmd_data:3085: hci0 opcode 0x0406\nhci_conn_del:1151: hci0 hcon ffff88800c999000 handle 3585\nhci_conn_unlink:1102: hci0: hcon ffff88800c999000\nhci_chan_list_flush:2780: hcon ffff88800c999000\nhci_chan_del:2761: hci0 hcon ffff88800c999000 chan ffff888018ddd280\n...\nBUG: KASAN: slab-use-after-free in hci_send_acl+0x2d/0x540 [bluetooth]\nRead of size 8 at addr ffff888018ddd298 by task bluetoothd/1175\n\nCPU: 0 PID: 1175 Comm: bluetoothd Tainted: G            E      6.4.0-rc4+ #2\nHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-1.fc38 04/01/2014\nCall Trace:\n \u003cTASK\u003e\n dump_stack_lvl+0x5b/0x90\n print_report+0xcf/0x670\n ? __virt_addr_valid+0xf8/0x180\n ? hci_send_acl+0x2d/0x540 [bluetooth]\n kasan_report+0xa8/0xe0\n ? hci_send_acl+0x2d/0x540 [bluetooth]\n hci_send_acl+0x2d/0x540 [bluetooth]\n ? __pfx___lock_acquire+0x10/0x10\n l2cap_chan_send+0x1fd/0x1300 [bluetooth]\n ? l2cap_sock_sendmsg+0xf2/0x170 [bluetooth]\n ? __pfx_l2cap_chan_send+0x10/0x10 [bluetooth]\n ? lock_release+0x1d5/0x3c0\n ? mark_held_locks+0x1a/0x90\n l2cap_sock_sendmsg+0x100/0x170 [bluetooth]\n sock_write_iter+0x275/0x280\n ? __pfx_sock_write_iter+0x10/0x10\n ? __pfx___lock_acquire+0x10/0x10\n do_iter_readv_writev+0x176/0x220\n ? __pfx_do_iter_readv_writev+0x10/0x10\n ? find_held_lock+0x83/0xa0\n ? selinux_file_permission+0x13e/0x210\n do_iter_write+0xda/0x340\n vfs_writev+0x1b4/0x400\n ? __pfx_vfs_writev+0x10/0x10\n ? __seccomp_filter+0x112/0x750\n ? populate_seccomp_data+0x182/0x220\n ? __fget_light+0xdf/0x100\n ? do_writev+0x19d/0x210\n do_writev+0x19d/0x210\n ? __pfx_do_writev+0x10/0x10\n ? mark_held_locks+0x1a/0x90\n do_syscall_64+0x60/0x90\n ? lockdep_hardirqs_on_prepare+0x149/0x210\n ? do_syscall_64+0x6c/0x90\n ? lockdep_hardirqs_on_prepare+0x149/0x210\n entry_SYSCALL_64_after_hwframe+0x72/0xdc\nRIP: 0033:0x7ff45cb23e64\nCode: 15 d1 1f 0d 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b8 0f 1f 00 f3 0f 1e fa 80 3d 9d a7 0d 00 00 74 13 b8 14 00 00 00 0f 05 \u003c48\u003e 3d 00 f0 ff ff 77 54 c3 0f 1f 00 48 83 ec 28 89 54 24 1c 48 89\nRSP: 002b:00007fff21ae09b8 EFLAGS: 00000202 ORIG_RAX: 0000000000000014\nRAX: ffffffffffffffda RBX: \n---truncated---"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:A - The bug is in the Bluetooth HCI event handler, triggered by a Command Status event for HCI_Disconnect whose failure status is induced by a peer device terminating the link concurrently with the host\u0027s disconnect. Exploitation requires only Bluetooth radio proximity to the target (phones, cars, headsets, laptops), which is CVSS Adjacent.\nAC:L - The attacker controls both sides of the race: closing the last L2CAP channel forces hcon-\u003edisc_timeout=0 and an immediate host Disconnect, and the attacker then tears down the link-layer connection at that moment so the controller answers Unknown Connection Identifier/Command Disallowed. The attempt costs nothing and can be repeated indefinitely by reconnecting.\nPR:N - No credentials or pairing are required \u2014 an L2CAP/ISO connection reaches l2cap_conn_add/iso_conn_add before authentication, and no capability check exists on the path. The attacker needs no account or privilege on the target system.\nUI:N - The dangling l2cap_conn-\u003ehchan and iso_conn-\u003ehcon are used by ordinary background traffic \u2014 the reported crash occurred in bluetoothd\u0027s normal write path \u2014 with no victim action needed. The attacker can also trigger the use itself via further protocol activity.\nS:U - The freed objects and the resulting corruption are entirely within the kernel\u0027s own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The freed hci_chan lives in the generic kmalloc-64 cache and hci_send_acl dereferences chan-\u003econn-\u003ehdev straight out of it, so a groomed reallocation yields a controlled pointer read of arbitrary kernel memory. Per kernel guidance, use-after-free is scored High confidentiality.\nI:H - Beyond the read primitive, hci_queue_acl writes skb list pointers into the freed object\u0027s data_q and later code operates on the forged hci_conn, giving heap-spray-driven write and control-flow influence. Use-after-free of a sprayable kmalloc object is scored High integrity.\nA:H - The bug reproduces as a KASAN slab-use-after-free in hci_send_acl and as a NULL pointer dereference oops in iso_sock_sendmsg, both fatal to the kernel context. Any kernel oops/panic is High availability."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T09:15:26.514Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/1ecf6dc2676ead4b927c50b1be0851fa4d756574"
        },
        {
          "url": "https://git.kernel.org/stable/c/59bd1e476bbc7bc6dff3c61bba787095a4839796"
        },
        {
          "url": "https://git.kernel.org/stable/c/093a07052406b363b1b2ab489e17dbadaf3e509b"
        },
        {
          "url": "https://git.kernel.org/stable/c/7f7cfcb6f0825652973b780f248603e23f16ee90"
        }
      ],
      "title": "Bluetooth: hci_event: call disconnect callback before deleting conn",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2023-53673",
    "datePublished": "2025-10-07T15:21:29.632Z",
    "dateReserved": "2025-10-07T15:16:59.663Z",
    "dateUpdated": "2026-08-05T09:15:26.514Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2023-53673",
      "date": "2026-08-08",
      "epss": "0.00228",
      "percentile": "0.13539"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2023-53673\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-10-07T16:15:51.247\",\"lastModified\":\"2026-06-17T06:45:50.660\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nBluetooth: hci_event: call disconnect callback before deleting conn\\n\\nIn hci_cs_disconnect, we do hci_conn_del even if disconnection failed.\\n\\nISO, L2CAP and SCO connections refer to the hci_conn without\\nhci_conn_get, so disconn_cfm must be called so they can clean up their\\nconn, otherwise use-after-free occurs.\\n\\nISO:\\n==========================================================\\niso_sock_connect:880: sk 00000000eabd6557\\niso_connect_cis:356: 70:1a:b8:98:ff:a2 -\u003e 28:3d:c2:4a:7e:da\\n...\\niso_conn_add:140: hcon 000000001696f1fd conn 00000000b6251073\\nhci_dev_put:1487: hci0 orig refcnt 17\\n__iso_chan_add:214: conn 00000000b6251073\\niso_sock_clear_timer:117: sock 00000000eabd6557 state 3\\n...\\nhci_rx_work:4085: hci0 Event packet\\nhci_event_packet:7601: hci0: event 0x0f\\nhci_cmd_status_evt:4346: hci0: opcode 0x0406\\nhci_cs_disconnect:2760: hci0: status 0x0c\\nhci_sent_cmd_data:3107: hci0 opcode 0x0406\\nhci_conn_del:1151: hci0 hcon 000000001696f1fd handle 2560\\nhci_conn_unlink:1102: hci0: hcon 000000001696f1fd\\nhci_conn_drop:1451: hcon 00000000d8521aaf orig refcnt 2\\nhci_chan_list_flush:2780: hcon 000000001696f1fd\\nhci_dev_put:1487: hci0 orig refcnt 21\\nhci_dev_put:1487: hci0 orig refcnt 20\\nhci_req_cmd_complete:3978: opcode 0x0406 status 0x0c\\n... \u003cno iso_* activity on sk/conn\u003e ...\\niso_sock_sendmsg:1098: sock 00000000dea5e2e0, sk 00000000eabd6557\\nBUG: kernel NULL pointer dereference, address: 0000000000000668\\nPGD 0 P4D 0\\nOops: 0000 [#1] PREEMPT SMP PTI\\nHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-1.fc38 04/01/2014\\nRIP: 0010:iso_sock_sendmsg (net/bluetooth/iso.c:1112) bluetooth\\n==========================================================\\n\\nL2CAP:\\n==================================================================\\nhci_cmd_status_evt:4359: hci0: opcode 0x0406\\nhci_cs_disconnect:2760: hci0: status 0x0c\\nhci_sent_cmd_data:3085: hci0 opcode 0x0406\\nhci_conn_del:1151: hci0 hcon ffff88800c999000 handle 3585\\nhci_conn_unlink:1102: hci0: hcon ffff88800c999000\\nhci_chan_list_flush:2780: hcon ffff88800c999000\\nhci_chan_del:2761: hci0 hcon ffff88800c999000 chan ffff888018ddd280\\n...\\nBUG: KASAN: slab-use-after-free in hci_send_acl+0x2d/0x540 [bluetooth]\\nRead of size 8 at addr ffff888018ddd298 by task bluetoothd/1175\\n\\nCPU: 0 PID: 1175 Comm: bluetoothd Tainted: G            E      6.4.0-rc4+ #2\\nHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-1.fc38 04/01/2014\\nCall Trace:\\n \u003cTASK\u003e\\n dump_stack_lvl+0x5b/0x90\\n print_report+0xcf/0x670\\n ? __virt_addr_valid+0xf8/0x180\\n ? hci_send_acl+0x2d/0x540 [bluetooth]\\n kasan_report+0xa8/0xe0\\n ? hci_send_acl+0x2d/0x540 [bluetooth]\\n hci_send_acl+0x2d/0x540 [bluetooth]\\n ? __pfx___lock_acquire+0x10/0x10\\n l2cap_chan_send+0x1fd/0x1300 [bluetooth]\\n ? l2cap_sock_sendmsg+0xf2/0x170 [bluetooth]\\n ? __pfx_l2cap_chan_send+0x10/0x10 [bluetooth]\\n ? lock_release+0x1d5/0x3c0\\n ? mark_held_locks+0x1a/0x90\\n l2cap_sock_sendmsg+0x100/0x170 [bluetooth]\\n sock_write_iter+0x275/0x280\\n ? __pfx_sock_write_iter+0x10/0x10\\n ? __pfx___lock_acquire+0x10/0x10\\n do_iter_readv_writev+0x176/0x220\\n ? __pfx_do_iter_readv_writev+0x10/0x10\\n ? find_held_lock+0x83/0xa0\\n ? selinux_file_permission+0x13e/0x210\\n do_iter_write+0xda/0x340\\n vfs_writev+0x1b4/0x400\\n ? __pfx_vfs_writev+0x10/0x10\\n ? __seccomp_filter+0x112/0x750\\n ? populate_seccomp_data+0x182/0x220\\n ? __fget_light+0xdf/0x100\\n ? do_writev+0x19d/0x210\\n do_writev+0x19d/0x210\\n ? __pfx_do_writev+0x10/0x10\\n ? mark_held_locks+0x1a/0x90\\n do_syscall_64+0x60/0x90\\n ? lockdep_hardirqs_on_prepare+0x149/0x210\\n ? do_syscall_64+0x6c/0x90\\n ? lockdep_hardirqs_on_prepare+0x149/0x210\\n entry_SYSCALL_64_after_hwframe+0x72/0xdc\\nRIP: 0033:0x7ff45cb23e64\\nCode: 15 d1 1f 0d 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b8 0f 1f 00 f3 0f 1e fa 80 3d 9d a7 0d 00 00 74 13 b8 14 00 00 00 0f 05 \u003c48\u003e 3d 00 f0 ff ff 77 54 c3 0f 1f 00 48 83 ec 28 89 54 24 1c 48 89\\nRSP: 002b:00007fff21ae09b8 EFLAGS: 00000202 ORIG_RAX: 0000000000000014\\nRAX: ffffffffffffffda RBX: \\n---truncated---\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/bluetooth/hci_event.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"b8d290525e3972b5e876b2649a42bf4081d753fe\",\"lessThan\":\"1ecf6dc2676ead4b927c50b1be0851fa4d756574\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b8d290525e3972b5e876b2649a42bf4081d753fe\",\"lessThan\":\"59bd1e476bbc7bc6dff3c61bba787095a4839796\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b8d290525e3972b5e876b2649a42bf4081d753fe\",\"lessThan\":\"093a07052406b363b1b2ab489e17dbadaf3e509b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b8d290525e3972b5e876b2649a42bf4081d753fe\",\"lessThan\":\"7f7cfcb6f0825652973b780f248603e23f16ee90\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/bluetooth/hci_event.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.7\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.7\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.200\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.42\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.4.7\",\"lessThanOrEqual\":\"6.4.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.5\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2026-06-10T20:41:12.221027Z\",\"id\":\"CVE-2023-53673\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"total\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-416\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.7\",\"versionEndExcluding\":\"5.15.200\",\"matchCriteriaId\":\"2FACD79F-B9E2-4080-BC89-2C6C8EDCB803\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.42\",\"matchCriteriaId\":\"6E769E6A-7EEF-4FA8-BF41-6CA1CE537361\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.4.7\",\"matchCriteriaId\":\"60A1A1ED-EA6C-42F6-80D3-3316DC7608C7\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.5:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"0B3E6E4D-E24E-4630-B00C-8C9901C597B0\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.5:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"E4A01A71-0F09-4DB2-A02F-7EFFBE27C98D\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/093a07052406b363b1b2ab489e17dbadaf3e509b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/1ecf6dc2676ead4b927c50b1be0851fa4d756574\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/59bd1e476bbc7bc6dff3c61bba787095a4839796\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/7f7cfcb6f0825652973b780f248603e23f16ee90\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-04T19:15:28+00:00",
      "cve": "CVE-2023-53673",
      "id": "CVE-2023-53673",
      "initial_release_date": "2023-01-01T00:00:00+00:00",
      "product_status:fixed": "1062",
      "product_status:known_affected": "36",
      "product_status:known_not_affected": "104",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Bluetooth: hci_event: call disconnect callback before deleting conn",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-53673.json",
      "version": "3"
    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2023-53673\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-06-10T20:41:12.221027Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-06-11T17:38:06.706Z\"}}], \"cna\": {\"title\": \"Bluetooth: hci_event: call disconnect callback before deleting conn\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"b8d290525e3972b5e876b2649a42bf4081d753fe\", \"lessThan\": \"1ecf6dc2676ead4b927c50b1be0851fa4d756574\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"b8d290525e3972b5e876b2649a42bf4081d753fe\", \"lessThan\": \"59bd1e476bbc7bc6dff3c61bba787095a4839796\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"b8d290525e3972b5e876b2649a42bf4081d753fe\", \"lessThan\": \"093a07052406b363b1b2ab489e17dbadaf3e509b\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"b8d290525e3972b5e876b2649a42bf4081d753fe\", \"lessThan\": \"7f7cfcb6f0825652973b780f248603e23f16ee90\", \"versionType\": \"git\"}], \"programFiles\": [\"net/bluetooth/hci_event.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.7\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.7\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.15.200\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.42\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.4.7\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.4.*\"}, {\"status\": \"unaffected\", \"version\": \"6.5\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/bluetooth/hci_event.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/1ecf6dc2676ead4b927c50b1be0851fa4d756574\"}, {\"url\": \"https://git.kernel.org/stable/c/59bd1e476bbc7bc6dff3c61bba787095a4839796\"}, {\"url\": \"https://git.kernel.org/stable/c/093a07052406b363b1b2ab489e17dbadaf3e509b\"}, {\"url\": \"https://git.kernel.org/stable/c/7f7cfcb6f0825652973b780f248603e23f16ee90\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nBluetooth: hci_event: call disconnect callback before deleting conn\\n\\nIn hci_cs_disconnect, we do hci_conn_del even if disconnection failed.\\n\\nISO, L2CAP and SCO connections refer to the hci_conn without\\nhci_conn_get, so disconn_cfm must be called so they can clean up their\\nconn, otherwise use-after-free occurs.\\n\\nISO:\\n==========================================================\\niso_sock_connect:880: sk 00000000eabd6557\\niso_connect_cis:356: 70:1a:b8:98:ff:a2 -\u003e 28:3d:c2:4a:7e:da\\n...\\niso_conn_add:140: hcon 000000001696f1fd conn 00000000b6251073\\nhci_dev_put:1487: hci0 orig refcnt 17\\n__iso_chan_add:214: conn 00000000b6251073\\niso_sock_clear_timer:117: sock 00000000eabd6557 state 3\\n...\\nhci_rx_work:4085: hci0 Event packet\\nhci_event_packet:7601: hci0: event 0x0f\\nhci_cmd_status_evt:4346: hci0: opcode 0x0406\\nhci_cs_disconnect:2760: hci0: status 0x0c\\nhci_sent_cmd_data:3107: hci0 opcode 0x0406\\nhci_conn_del:1151: hci0 hcon 000000001696f1fd handle 2560\\nhci_conn_unlink:1102: hci0: hcon 000000001696f1fd\\nhci_conn_drop:1451: hcon 00000000d8521aaf orig refcnt 2\\nhci_chan_list_flush:2780: hcon 000000001696f1fd\\nhci_dev_put:1487: hci0 orig refcnt 21\\nhci_dev_put:1487: hci0 orig refcnt 20\\nhci_req_cmd_complete:3978: opcode 0x0406 status 0x0c\\n... \u003cno iso_* activity on sk/conn\u003e ...\\niso_sock_sendmsg:1098: sock 00000000dea5e2e0, sk 00000000eabd6557\\nBUG: kernel NULL pointer dereference, address: 0000000000000668\\nPGD 0 P4D 0\\nOops: 0000 [#1] PREEMPT SMP PTI\\nHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-1.fc38 04/01/2014\\nRIP: 0010:iso_sock_sendmsg (net/bluetooth/iso.c:1112) bluetooth\\n==========================================================\\n\\nL2CAP:\\n==================================================================\\nhci_cmd_status_evt:4359: hci0: opcode 0x0406\\nhci_cs_disconnect:2760: hci0: status 0x0c\\nhci_sent_cmd_data:3085: hci0 opcode 0x0406\\nhci_conn_del:1151: hci0 hcon ffff88800c999000 handle 3585\\nhci_conn_unlink:1102: hci0: hcon ffff88800c999000\\nhci_chan_list_flush:2780: hcon ffff88800c999000\\nhci_chan_del:2761: hci0 hcon ffff88800c999000 chan ffff888018ddd280\\n...\\nBUG: KASAN: slab-use-after-free in hci_send_acl+0x2d/0x540 [bluetooth]\\nRead of size 8 at addr ffff888018ddd298 by task bluetoothd/1175\\n\\nCPU: 0 PID: 1175 Comm: bluetoothd Tainted: G            E      6.4.0-rc4+ #2\\nHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-1.fc38 04/01/2014\\nCall Trace:\\n \u003cTASK\u003e\\n dump_stack_lvl+0x5b/0x90\\n print_report+0xcf/0x670\\n ? __virt_addr_valid+0xf8/0x180\\n ? hci_send_acl+0x2d/0x540 [bluetooth]\\n kasan_report+0xa8/0xe0\\n ? hci_send_acl+0x2d/0x540 [bluetooth]\\n hci_send_acl+0x2d/0x540 [bluetooth]\\n ? __pfx___lock_acquire+0x10/0x10\\n l2cap_chan_send+0x1fd/0x1300 [bluetooth]\\n ? l2cap_sock_sendmsg+0xf2/0x170 [bluetooth]\\n ? __pfx_l2cap_chan_send+0x10/0x10 [bluetooth]\\n ? lock_release+0x1d5/0x3c0\\n ? mark_held_locks+0x1a/0x90\\n l2cap_sock_sendmsg+0x100/0x170 [bluetooth]\\n sock_write_iter+0x275/0x280\\n ? __pfx_sock_write_iter+0x10/0x10\\n ? __pfx___lock_acquire+0x10/0x10\\n do_iter_readv_writev+0x176/0x220\\n ? __pfx_do_iter_readv_writev+0x10/0x10\\n ? find_held_lock+0x83/0xa0\\n ? selinux_file_permission+0x13e/0x210\\n do_iter_write+0xda/0x340\\n vfs_writev+0x1b4/0x400\\n ? __pfx_vfs_writev+0x10/0x10\\n ? __seccomp_filter+0x112/0x750\\n ? populate_seccomp_data+0x182/0x220\\n ? __fget_light+0xdf/0x100\\n ? do_writev+0x19d/0x210\\n do_writev+0x19d/0x210\\n ? __pfx_do_writev+0x10/0x10\\n ? mark_held_locks+0x1a/0x90\\n do_syscall_64+0x60/0x90\\n ? lockdep_hardirqs_on_prepare+0x149/0x210\\n ? do_syscall_64+0x6c/0x90\\n ? lockdep_hardirqs_on_prepare+0x149/0x210\\n entry_SYSCALL_64_after_hwframe+0x72/0xdc\\nRIP: 0033:0x7ff45cb23e64\\nCode: 15 d1 1f 0d 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b8 0f 1f 00 f3 0f 1e fa 80 3d 9d a7 0d 00 00 74 13 b8 14 00 00 00 0f 05 \u003c48\u003e 3d 00 f0 ff ff 77 54 c3 0f 1f 00 48 83 ec 28 89 54 24 1c 48 89\\nRSP: 002b:00007fff21ae09b8 EFLAGS: 00000202 ORIG_RAX: 0000000000000014\\nRAX: ffffffffffffffda RBX: \\n---truncated---\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.200\", \"versionStartIncluding\": \"5.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.42\", \"versionStartIncluding\": \"5.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.4.7\", \"versionStartIncluding\": \"5.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.5\", \"versionStartIncluding\": \"5.7\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-11T19:49:42.170Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2023-53673\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-06-11T18:44:09.846Z\", \"dateReserved\": \"2025-10-07T15:16:59.663Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-10-07T15:21:29.632Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.