CVE-2024-27416 (GCVE-0-2024-27416)
Vulnerability from cvelistv5 – Published: 2024-05-17 11:51 – Updated: 2026-08-05 11:29
VLAI
EPSS
VEX
Title
Bluetooth: hci_event: Fix handling of HCI_EV_IO_CAPA_REQUEST
Summary
In the Linux kernel, the following vulnerability has been resolved:
Bluetooth: hci_event: Fix handling of HCI_EV_IO_CAPA_REQUEST
If we received HCI_EV_IO_CAPA_REQUEST while
HCI_OP_READ_REMOTE_EXT_FEATURES is yet to be responded assume the remote
does support SSP since otherwise this event shouldn't be generated.
Severity
8.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-06-12 15:20 UTC
Assigner
References
10 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
ccb8618c972f941ebc6b2b9db491025b3369efcb , < afec8f772296dd8e5a2a6f83bbf99db1b9ca877f
(git)
Affected: 1769ac55dbf3114d5bf79f11bd5dca80ee263f9c , < 79820a7e1e057120c49be07cbe10643d0706b259 (git) Affected: 40a33a129d99639921ce00d274cca44ba282f1ac , < df193568d61234c81de7ed4d540c01975de60277 (git) Affected: 1ef071526848cc3109ade63268854cd7c20ece0c , < c3df637266df29edee85e94cab5fd7041e5753ba (git) Affected: 25e5d2883002e235f3378b8592aad14aeeef898c , < 30a5e812f78e3d1cced90e1ed750bf027599205f (git) Affected: c7f59461f5a78994613afc112cdd73688aef9076 , < fba268ac36ab19f9763ff90d276cde0ce6cd5f31 (git) Affected: c7f59461f5a78994613afc112cdd73688aef9076 , < 8e2758cc25891d2b76717aaf89b40ed215de188c (git) Affected: c7f59461f5a78994613afc112cdd73688aef9076 , < 7e74aa53a68bf60f6019bd5d9a9a1406ec4d4865 (git) Affected: 2c7f9fda663a1b31a61744ffc456bdb89c4efc7f (git) Affected: 746dbb0fc6392eca23de27f8aa9d13979b564889 (git) Affected: 4.19.297 , < 4.19.309 (semver) Affected: 5.4.259 , < 5.4.271 (semver) Affected: 5.10.199 , < 5.10.212 (semver) Affected: 5.15.137 , < 5.15.151 (semver) Affected: 6.1.60 , < 6.1.81 (semver) Affected: 4.14.328 , < 4.15 (semver) Affected: 6.5.9 , < 6.6 (semver) |
guessed | |
| Linux | Linux |
Affected:
6.6
Unaffected: 0 , < 6.6 (semver) Unaffected: 4.19.309 , ≤ 4.19.* (semver) Unaffected: 5.4.271 , ≤ 5.4.* (semver) Unaffected: 5.10.212 , ≤ 5.10.* (semver) Unaffected: 5.15.151 , ≤ 5.15.* (semver) Unaffected: 6.1.81 , ≤ 6.1.* (semver) Unaffected: 6.6.21 , ≤ 6.6.* (semver) Unaffected: 6.7.9 , ≤ 6.7.* (semver) Unaffected: 6.8 , ≤ * (original_commit_for_fix) |
guessed |
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.7.9",
"versionStartIncluding": "6.6",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.8",
"versionStartIncluding": "6.6",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.14.328",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "6.5.9",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_event: Fix handling of HCI_EV_IO_CAPA_REQUEST\n\nIf we received HCI_EV_IO_CAPA_REQUEST while\nHCI_OP_READ_REMOTE_EXT_FEATURES is yet to be responded assume the remote\ndoes support SSP since otherwise this event shouldn\u0027t be generated."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 8.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:A - The vulnerable handler processes HCI events generated by a BR/EDR peer that initiates Secure Simple Pairing over an ACL link, so the attacker must be within Bluetooth radio range of the target. Per kernel scoring convention Bluetooth is Adjacent.\nAC:L - The attacker controls its own controller\u0027s LMP timing and simply starts SSP immediately upon connection-complete, which reliably beats the host\u0027s extra Read Remote Extended Features HCI command plus LMP round trip; the attempt can also be repeated without limit.\nPR:N - HCI_EV_IO_CAPA_REQUEST and HCI_EV_SIMPLE_PAIR_COMPLETE are handled during the pre-bonding pairing phase, before any credentials or link key exist, and the guard is hit before even the HCI_MGMT/HCI_BONDABLE policy checks. No privileges on the target are required.\nUI:N - Reaching the code needs only an ACL connection to a connectable or accept-listed host, which is the default steady state for embedded, automotive, audio, kiosk and previously-paired deployments. No victim action is needed to trigger the event sequence.\nS:U - The corrupted state (hci_conn reference count and connection lifetime) lives entirely within the kernel\u0027s own security authority; no VM, IOMMU or sandbox boundary is crossed.\nC:H - The unbalanced hci_conn_drop() reintroduces a reference-count underflow (CWE-911) on a kernel object, which can drive the connection to teardown while pairing-state-machine work still references it \u2014 a use-after-free class defect whose reclaimed memory can be leveraged for kernel information disclosure.\nI:H - The same refcount underflow lets an attacker-controlled peer desynchronize hci_conn lifetime accounting, and a freed-then-reused hci_conn under remote-influenced heap grooming yields write/control-flow primitives; the guidance treats use-after-free as High integrity impact.\nA:H - A remote peer can reliably stall SSP so pairing never completes, trigger WARN_ON(refcnt \u003c 0) in hci_conn_timeout() (a panic on panic_on_warn builds such as Android and hardened distro kernels), abort a live ACL link prematurely, or leak connections that never time out and exhaust the controller\u0027s ACL slots."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-05T11:29:45.374Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/afec8f772296dd8e5a2a6f83bbf99db1b9ca877f"
},
{
"url": "https://git.kernel.org/stable/c/79820a7e1e057120c49be07cbe10643d0706b259"
},
{
"url": "https://git.kernel.org/stable/c/df193568d61234c81de7ed4d540c01975de60277"
},
{
"url": "https://git.kernel.org/stable/c/c3df637266df29edee85e94cab5fd7041e5753ba"
},
{
"url": "https://git.kernel.org/stable/c/30a5e812f78e3d1cced90e1ed750bf027599205f"
},
{
"url": "https://git.kernel.org/stable/c/fba268ac36ab19f9763ff90d276cde0ce6cd5f31"
},
{
"url": "https://git.kernel.org/stable/c/8e2758cc25891d2b76717aaf89b40ed215de188c"
},
{
"url": "https://git.kernel.org/stable/c/7e74aa53a68bf60f6019bd5d9a9a1406ec4d4865"
}
],
"title": "Bluetooth: hci_event: Fix handling of HCI_EV_IO_CAPA_REQUEST",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2024-27416",
"datePublished": "2024-05-17T11:51:04.270Z",
"dateReserved": "2024-02-25T13:47:42.682Z",
"dateUpdated": "2026-08-05T11:29:45.374Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.