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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"lessThan": "df193568d61234c81de7ed4d540c01975de60277",
"status": "affected",
"version": "40a33a129d99639921ce00d274cca44ba282f1ac",
"versionType": "git"
},
{
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"status": "affected",
"version": "1ef071526848cc3109ade63268854cd7c20ece0c",
"versionType": "git"
},
{
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"status": "affected",
"version": "25e5d2883002e235f3378b8592aad14aeeef898c",
"versionType": "git"
},
{
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"status": "affected",
"version": "c7f59461f5a78994613afc112cdd73688aef9076",
"versionType": "git"
},
{
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"status": "affected",
"version": "c7f59461f5a78994613afc112cdd73688aef9076",
"versionType": "git"
},
{
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"status": "affected",
"version": "c7f59461f5a78994613afc112cdd73688aef9076",
"versionType": "git"
},
{
"status": "affected",
"version": "2c7f9fda663a1b31a61744ffc456bdb89c4efc7f",
"versionType": "git"
},
{
"status": "affected",
"version": "746dbb0fc6392eca23de27f8aa9d13979b564889",
"versionType": "git"
},
{
"lessThan": "4.19.309",
"status": "affected",
"version": "4.19.297",
"versionType": "semver"
},
{
"lessThan": "5.4.271",
"status": "affected",
"version": "5.4.259",
"versionType": "semver"
},
{
"lessThan": "5.10.212",
"status": "affected",
"version": "5.10.199",
"versionType": "semver"
},
{
"lessThan": "5.15.151",
"status": "affected",
"version": "5.15.137",
"versionType": "semver"
},
{
"lessThan": "6.1.81",
"status": "affected",
"version": "6.1.60",
"versionType": "semver"
},
{
"lessThan": "4.15",
"status": "affected",
"version": "4.14.328",
"versionType": "semver"
},
{
"lessThan": "6.6",
"status": "affected",
"version": "6.5.9",
"versionType": "semver"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"net/bluetooth/hci_event.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "6.6"
},
{
"lessThan": "6.6",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "4.19.*",
"status": "unaffected",
"version": "4.19.309",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.4.*",
"status": "unaffected",
"version": "5.4.271",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.212",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.151",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.81",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.21",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.7.*",
"status": "unaffected",
"version": "6.7.9",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "6.8",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "4.19.309",
"versionStartIncluding": "4.19.297",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.4.271",
"versionStartIncluding": "5.4.259",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.10.212",
"versionStartIncluding": "5.10.199",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.151",
"versionStartIncluding": "5.15.137",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.81",
"versionStartIncluding": "6.1.60",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.21",
"versionStartIncluding": "6.6",
"vulnerable": true
},
{
"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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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.
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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.
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