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vuln-cve/data/2024/42xxx/CVE-2024-42133.json
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{
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"cveId": "CVE-2024-42133",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2024-07-29T15:50:41.186Z",
"datePublished": "2024-07-30T07:46:28.632Z",
"dateUpdated": "2026-08-05T11:35:50.732Z"
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{
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: Ignore too large handle values in BIG\n\nhci_le_big_sync_established_evt is necessary to filter out cases where the\nhandle value is belonging to ida id range, otherwise ida will be erroneously\nreleased in hci_conn_cleanup."
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"vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H",
"baseScore": 7.6,
"baseSeverity": "HIGH"
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{
"lang": "en",
"value": "AV:A - The vulnerable code is the Bluetooth HCI event path (`hci_le_big_sync_established_evt`), reached only as a consequence of synchronizing to a Broadcast Isochronous Group advertised by a remote device in radio range. Per Bluetooth scoring convention this is Adjacent.\nAC:L - No race, no memory-layout grooming, and no timing dependency — a single BIG Sync Established event carrying a BIS handle above 0x0eff deterministically creates a bogus \"unset\" hci_conn whose teardown always hits the ida_free WARN.\nPR:N - Broadcast/periodic-advertising sync (LE Audio / Auracast) requires no pairing, bonding, or authentication, and no local account is needed; the attacker is an unauthenticated peer in range of a host with LE Audio/ISO enabled.\nUI:N - The event handler runs automatically in `hci_rx_work` as part of normal broadcast-sync processing on a configured ISO sink; no victim action is required at attack time.\nS:U - The corruption is confined to the kernel's own Bluetooth connection hash and IDA state within the same security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:L - The `WARN(1, ...)` in `ida_free()` emits a full register and stack backtrace containing kernel text and heap addresses, giving a bounded KASLR-defeating info leak, and duplicate handles can route inbound ACL/ISO data to the wrong connection; there is no arbitrary read primitive.\nI:L - The bogus handle desynchronizes `hdev->unset_handle_ida` so the same handle is issued to a second live connection and `hci_conn_hash_lookup_handle()` resolves to the wrong `hci_conn`, letting ISO QoS state and L2CAP processing be applied to a mismatched link object. This is bounded kernel-state modification, not an arbitrary write.\nA:H - The bug reliably triggers a kernel WARNING, which is a panic on the many deployments (Android, CI, hardened distros) running with `panic_on_warn`, and the resulting duplicate-handle confusion persistently disrupts Bluetooth connection handling."
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"url": "https://git.kernel.org/stable/c/38263088b845abeeeb98dda5b87c0de3063b6dbb"
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"url": "https://git.kernel.org/stable/c/015d79c96d62cd8a4a359fcf5be40d58088c936b"
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"title": "Bluetooth: Ignore too large handle values in BIG",
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"version": "2.0.3",
"timestamp": "2024-09-10T16:16:19.014130Z"
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