{ "schema_version": "1.6.1", "id": "RPI-CVE-2024-38620", "modified": "2026-10-09T11:39:44Z", "upstream": [ "CVE-2024-38620" ], "published": "2024-06-20T08:04:14Z", "summary": "Bluetooth: HCI: Remove HCI_AMP support", "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: HCI: Remove HCI_AMP support\n\nSince BT_HS has been remove HCI_AMP controllers no longer has any use so\nremove it along with the capability of creating AMP controllers.\n\nSince we no longer need to differentiate between AMP and Primary\ncontrollers, as only HCI_PRIMARY is left, this also remove\nhdev->dev_type altogether.", "severity": [ { "type": "CVSS_V3", "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H" } ], "affected": [ { "package": { "ecosystem": "Raspberry Pi OS:12", "name": "linux" }, "versions": [ "1:6.1.21-1+rpt1", "1:6.1.47-1+rpt2", "1:6.1.47-1+rpt4", "1:6.1.54-1+rpt2", "1:6.1.58-1+rpt2", "1:6.1.63-1+rpt1", "1:6.1.73-1+rpt1", "1:6.6.20-1+rpt1", 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"https://git.kernel.org/pub/scm/linux/security/vulns.git", "upstream_modified": "2026-08-23T12:46:35Z", "severity": { "source": "kernel CNA", "cvss_v3_score": 8.8, "cvss_v3_severity": "High", "scenario": "AV:A - The broken paths (`l2cap_recv_acldata`, `l2cap_connect`, `l2cap_connect_cfm`\u2192`l2cap_conn_add`, `hci_queue_acl`, `hci_num_comp_blocks_evt`) all process ACL/L2CAP traffic and link events originating from a remote Bluetooth peer in radio range of an AMP-capable controller, which real hardware ships as (btusb USB class e0/01/04, btmrvl SDIO combo chips, btsdio SDIO_CLASS_BT_AMP, virtio-bt). Bluetooth radio proximity is the adjacent-network vector.\nAC:L - Once an HCI_AMP controller is present \u2014 the default state on affected hardware, requiring no attacker setup \u2014 the inconsistent paths are reached deterministically by initiating an ACL/L2CAP connection and sending data; there is no race and no memory layout the attacker cannot influence.\nPR:N - An adjacent Bluetooth attacker needs no credentials on the target: `hci_conn_request_evt` and `l2cap_connect_cfm`/`l2cap_conn_add` run before any pairing or authorization, and `l2cap_connect` explicitly exempts the SDP PSM from the link-mode security check.\nUI:N - No victim action is required \u2014 inbound connection establishment and ACL data reception are handled autonomously by the kernel once Bluetooth is up.\nS:U - All corruption and crashes stay inside the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - `hci_queue_acl()` builds ACL headers from `chan->handle` rather than `conn->handle` on AMP hdevs, so L2CAP payloads can be emitted tagged with the wrong link handle, and the state corruption in the connection/scheduler bookkeeping is of a class leverageable for kernel memory disclosure.\nI:H - `hci_num_comp_blocks_evt` applies an unbounded `conn->sent -= block_count` to a `hci_chan` that should never have existed, underflowing an unsigned counter that drives `hci_quote_sent`/`hci_low_sent` quota arithmetic, and the ACL handle confusion lets frames be attributed to the wrong connection \u2014 kernel state under attacker influence.\nA:H - `__get_blocks()` divides by controller-supplied `hdev->block_len` on the block-based path that only AMP controllers select, giving a divide-by-zero kernel oops; separately, `hci_sched_acl()` never drains the AMP queues so `chan->data_q` grows without bound until memory is exhausted." } } }