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          "product": "Linux",
          "programFiles": [
            "include/net/bluetooth/hci.h",
            "include/net/bluetooth/hci_core.h",
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            "net/bluetooth/hci_event.c",
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              "version": "2.6.39"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: Fix div-by-zero in l2cap_le_flowctl_init()\n\nl2cap_le_flowctl_init() can cause both div-by-zero and an integer\noverflow since hdev-\u003ele_mtu may not fall in the valid range.\n\nMove MTU from hci_dev to hci_conn to validate MTU and stop the connection\nprocess earlier if MTU is invalid.\nAlso, add a missing validation in read_buffer_size() and make it return\nan error value if the validation fails.\nNow hci_conn_add() returns ERR_PTR() as it can fail due to the both a\nkzalloc failure and invalid MTU value.\n\ndivide error: 0000 [#1] PREEMPT SMP KASAN NOPTI\nCPU: 0 PID: 67 Comm: kworker/u5:0 Tainted: G        W          6.9.0-rc5+ #20\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014\nWorkqueue: hci0 hci_rx_work\nRIP: 0010:l2cap_le_flowctl_init+0x19e/0x3f0 net/bluetooth/l2cap_core.c:547\nCode: e8 17 17 0c 00 66 41 89 9f 84 00 00 00 bf 01 00 00 00 41 b8 02 00 00 00 4c\n89 fe 4c 89 e2 89 d9 e8 27 17 0c 00 44 89 f0 31 d2 \u003c66\u003e f7 f3 89 c3 ff c3 4d 8d\nb7 88 00 00 00 4c 89 f0 48 c1 e8 03 42\nRSP: 0018:ffff88810bc0f858 EFLAGS: 00010246\nRAX: 00000000000002a0 RBX: 0000000000000000 RCX: dffffc0000000000\nRDX: 0000000000000000 RSI: ffff88810bc0f7c0 RDI: ffffc90002dcb66f\nRBP: ffff88810bc0f880 R08: aa69db2dda70ff01 R09: 0000ffaaaaaaaaaa\nR10: 0084000000ffaaaa R11: 0000000000000000 R12: ffff88810d65a084\nR13: dffffc0000000000 R14: 00000000000002a0 R15: ffff88810d65a000\nFS:  0000000000000000(0000) GS:ffff88811ac00000(0000) knlGS:0000000000000000\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 0000000020000100 CR3: 0000000103268003 CR4: 0000000000770ef0\nPKRU: 55555554\nCall Trace:\n \u003cTASK\u003e\n l2cap_le_connect_req net/bluetooth/l2cap_core.c:4902 [inline]\n l2cap_le_sig_cmd net/bluetooth/l2cap_core.c:5420 [inline]\n l2cap_le_sig_channel net/bluetooth/l2cap_core.c:5486 [inline]\n l2cap_recv_frame+0xe59d/0x11710 net/bluetooth/l2cap_core.c:6809\n l2cap_recv_acldata+0x544/0x10a0 net/bluetooth/l2cap_core.c:7506\n hci_acldata_packet net/bluetooth/hci_core.c:3939 [inline]\n hci_rx_work+0x5e5/0xb20 net/bluetooth/hci_core.c:4176\n process_one_work kernel/workqueue.c:3254 [inline]\n process_scheduled_works+0x90f/0x1530 kernel/workqueue.c:3335\n worker_thread+0x926/0xe70 kernel/workqueue.c:3416\n kthread+0x2e3/0x380 kernel/kthread.c:388\n ret_from_fork+0x5c/0x90 arch/x86/kernel/process.c:147\n ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244\n \u003c/TASK\u003e\nModules linked in:\n---[ end trace 0000000000000000 ]---"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.6,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:A - The crash executes in `hci_rx_work` on receipt of an L2CAP LE Credit Based Connection Request from a Bluetooth LE peer in radio range, and the malformed buffer-size value originates from the HCI controller/transport \u2014 both are adjacent-network (Bluetooth PAN) attack surfaces, not routable network or purely local ones.\nAC:L - Nothing is probabilistic or beyond attacker control: an attacker owning the HCI transport (rogue USB/UART dongle or over-the-air-compromised controller firmware) sets `le_mtu` deterministically, and on a device whose controller reports an out-of-spec LE buffer size a single unauthenticated L2CAP packet triggers it on the first try.\nPR:N - `l2cap_le_connect_req()` is handled on the LE signalling channel and `smp_sufficient_security()` returns true immediately for the default `BT_SECURITY_LOW`, so no pairing, bonding, encryption or any local account is required.\nUI:N - The divide error occurs entirely inside the kernel receive workqueue when the L2CAP connect request is processed; no victim action such as accepting a pairing prompt or opening a file is involved.\nS:U - The faulting code and its impact are both inside the kernel\u0027s own security authority \u2014 no VM, IOMMU, or sandbox boundary is crossed.\nC:L - The unvalidated MTU underflows size computations in `l2cap_create_basic_pdu()` (`conn-\u003emtu - L2CAP_HDR_SIZE`) and `l2cap_segment_sdu()` (size_t `pdu_len`) and inflates `chan-\u003emps` past the real link MTU, giving bounded length confusion in L2CAP PDU construction plus register/state exposure in the oops, rather than an arbitrary read primitive.\nI:L - The same u16/size_t underflows let malformed, oversized L2CAP PDUs and credit values be built and transmitted with sizes partly steered by the peer\u0027s `remote_mps`, corrupting protocol state in a limited way short of an arbitrary kernel write.\nA:H - The `mps == 0` case is a hard divide error oops in the `hci_rx_work` kernel workqueue (fatal panic with panic_on_oops, dead Bluetooth stack otherwise), and the related `iso_mtu == 0` path spins forever in `iso_sock_sendmsg()` allocating skbs \u2014 an unrecoverable hang."
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        "dateUpdated": "2026-08-05T11:32:21.130Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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          "url": "https://git.kernel.org/stable/c/a5b862c6a221459d54e494e88965b48dcfa6cc44"
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      "title": "Bluetooth: L2CAP: Fix div-by-zero in l2cap_le_flowctl_init()",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2024-36968",
    "datePublished": "2024-06-08T12:53:00.562Z",
    "dateReserved": "2024-05-30T15:25:07.081Z",
    "dateUpdated": "2026-08-05T11:32:21.130Z",
    "state": "PUBLISHED"
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