CVE-2024-38620

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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."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": 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"affected", "versionType": "git"}, {"version": "244bc377591c3882f454882357bc730c90cbedb5", "lessThan": "d3c7b012d912b31ad23b9349c0e499d6dddd48ec", "status": "affected", "versionType": "git"}, {"version": "244bc377591c3882f454882357bc730c90cbedb5", "lessThan": "af1d425b6dc67cd67809f835dd7afb6be4d43e03", "status": "affected", "versionType": "git"}, {"version": "244bc377591c3882f454882357bc730c90cbedb5", "lessThan": "84a4bb6548a29326564f0e659fb8064503ecc1c7", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "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": [{"version": "4.3", "status": "affected"}, {"version": "0", "lessThan": "4.3", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.184", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.33", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.8.12", "lessThanOrEqual": "6.8.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.9.3", "lessThanOrEqual": "6.9.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.10", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": 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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."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", 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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "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"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "9e6cf0eccfe15b67bf9773ecd101162dfdfed5e2", "status": "affected", "version": "244bc377591c3882f454882357bc730c90cbedb5", "versionType": "git"}, {"lessThan": "5af2e235b0d5b797e9531a00c50058319130e156", "status": "affected", "version": "244bc377591c3882f454882357bc730c90cbedb5", "versionType": "git"}, {"lessThan": "d3c7b012d912b31ad23b9349c0e499d6dddd48ec", "status": "affected", "version": "244bc377591c3882f454882357bc730c90cbedb5", "versionType": "git"}, {"lessThan": "af1d425b6dc67cd67809f835dd7afb6be4d43e03", "status": "affected", "version": "244bc377591c3882f454882357bc730c90cbedb5", "versionType": "git"}, {"lessThan": "84a4bb6548a29326564f0e659fb8064503ecc1c7", "status": "affected", "version": "244bc377591c3882f454882357bc730c90cbedb5", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "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"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "4.3"}, {"lessThan": "4.3", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.184", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.33", "versionType": "semver"}, {"lessThanOrEqual": "6.8.*", "status": "unaffected", "version": "6.8.12", "versionType": "semver"}, {"lessThanOrEqual": "6.9.*", "status": "unaffected", "version": "6.9.3", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "6.10", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "69FDB5EB-450C-44B2-882E-8B68A401BA09", "versionEndExcluding": "6.6.33", "versionStartIncluding": "4.3", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "80550309-67AB-4FD1-AC07-3DED5C4F01B2", "versionEndExcluding": "6.8.12", "versionStartIncluding": "6.7", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "E07124C1-19E8-4D21-828D-9932A01D3011", "versionEndExcluding": "6.9.3", "versionStartIncluding": "6.9", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "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."}, {"lang": "es", "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: Bluetooth: HCI: eliminar la compatibilidad con HCI_AMP Dado que se elimin\u00f3 BT_HS, los controladores HCI_AMP ya no tienen ning\u00fan uso, as\u00ed que elim\u00ednelos junto con la capacidad de crear controladores AMP. Como ya no necesitamos diferenciar entre los controladores AMP y primarios, ya que solo queda HCI_PRIMARY, esto tambi\u00e9n elimina hdev->dev_type por completo."}], "id": "CVE-2024-38620", "lastModified": "2026-08-23T13:16:24.440", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "ADJACENT_NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2024-38620", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-06-20T16:21:10.645379Z", "version": "2.0.3"}}]}, "published": "2024-06-20T08:15:38.377", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5af2e235b0d5b797e9531a00c50058319130e156"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/84a4bb6548a29326564f0e659fb8064503ecc1c7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9e6cf0eccfe15b67bf9773ecd101162dfdfed5e2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/af1d425b6dc67cd67809f835dd7afb6be4d43e03"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d3c7b012d912b31ad23b9349c0e499d6dddd48ec"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5af2e235b0d5b797e9531a00c50058319130e156"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/84a4bb6548a29326564f0e659fb8064503ecc1c7"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/af1d425b6dc67cd67809f835dd7afb6be4d43e03"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d3c7b012d912b31ad23b9349c0e499d6dddd48ec"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: Bluetooth: HCI: Remove HCI_AMP support", "id": "2293275", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2293275"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-1164", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nBluetooth: HCI: Remove HCI_AMP support\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.\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."], "name": "CVE-2024-38620", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-06-20T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-38620\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-38620\nhttps://lore.kernel.org/linux-cve-announce/2024062047-CVE-2024-38620-64ef@gregkh/T"], "threat_severity": "Low"}

{"created": "2025-07-12T15:42:37.953373+00:00", "updated": "2025-07-12T15:42:37.953433+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}