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vuln-cve/data/2024/38xxx/CVE-2024-38620.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2024-38620",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2024-06-18T19:36:34.945Z",
"datePublished": "2024-06-20T08:03:43.906Z",
"dateUpdated": "2026-08-23T12:45:18.071Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-08-23T12:45:18.071Z"
},
"descriptions": [
{
"lang": "en",
"value": "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."
}
],
"metrics": [
{
"cvssV3_1": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"baseScore": 8.8,
"baseSeverity": "HIGH"
},
"scenarios": [
{
"lang": "en",
"value": "AV:A - The broken paths (`l2cap_recv_acldata`, `l2cap_connect`, `l2cap_connect_cfm`→`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 — the default state on affected hardware, requiring no attacker setup — 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 — 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 — 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."
}
]
}
],
"affected": [
{
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"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"drivers/bluetooth/btmrvl_main.c",
"drivers/bluetooth/btrsi.c",
"drivers/bluetooth/btsdio.c",
"drivers/bluetooth/btusb.c",
"drivers/bluetooth/hci_bcm4377.c",
"drivers/bluetooth/hci_ldisc.c",
"drivers/bluetooth/hci_serdev.c",
"drivers/bluetooth/hci_uart.h",
"drivers/bluetooth/hci_vhci.c",
"drivers/bluetooth/virtio_bt.c",
"include/net/bluetooth/hci.h",
"include/net/bluetooth/hci_core.h",
"include/uapi/linux/virtio_bt.h",
"net/bluetooth/hci_conn.c",
"net/bluetooth/hci_core.c",
"net/bluetooth/hci_event.c",
"net/bluetooth/hci_sock.c",
"net/bluetooth/hci_sync.c",
"net/bluetooth/l2cap_core.c",
"net/bluetooth/mgmt.c"
],
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"lessThan": "9e6cf0eccfe15b67bf9773ecd101162dfdfed5e2",
"status": "affected",
"versionType": "git"
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"drivers/bluetooth/btmrvl_main.c",
"drivers/bluetooth/btrsi.c",
"drivers/bluetooth/btsdio.c",
"drivers/bluetooth/btusb.c",
"drivers/bluetooth/hci_bcm4377.c",
"drivers/bluetooth/hci_ldisc.c",
"drivers/bluetooth/hci_serdev.c",
"drivers/bluetooth/hci_uart.h",
"drivers/bluetooth/hci_vhci.c",
"drivers/bluetooth/virtio_bt.c",
"include/net/bluetooth/hci.h",
"include/net/bluetooth/hci_core.h",
"include/uapi/linux/virtio_bt.h",
"net/bluetooth/hci_conn.c",
"net/bluetooth/hci_core.c",
"net/bluetooth/hci_event.c",
"net/bluetooth/hci_sock.c",
"net/bluetooth/hci_sync.c",
"net/bluetooth/l2cap_core.c",
"net/bluetooth/mgmt.c"
],
"versions": [
{
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"status": "affected"
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{
"version": "0",
"lessThan": "4.3",
"status": "unaffected",
"versionType": "semver"
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{
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"lessThanOrEqual": "6.6.*",
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{
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{
"version": "6.9.3",
"lessThanOrEqual": "6.9.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.10",
"lessThanOrEqual": "*",
"status": "unaffected",
"versionType": "original_commit_for_fix"
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"nodes": [
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"negate": false,
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"url": "https://git.kernel.org/stable/c/84a4bb6548a29326564f0e659fb8064503ecc1c7"
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"title": "Bluetooth: HCI: Remove HCI_AMP support",
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"content": {
"timestamp": "2024-06-20T16:21:10.645379Z",
"id": "CVE-2024-38620",
"options": [
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"role": "CISA Coordinator",
"version": "2.0.3"
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"title": "CISA ADP Vulnrichment",
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"shortName": "CVE",
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"title": "CVE Program Container",
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