CVE-2021-47620 (GCVE-0-2021-47620)
Vulnerability from cvelistv5 – Published: 2024-06-20 11:08 – Updated: 2026-08-05 08:48
VLAI
EPSS
VEX
Title
Bluetooth: refactor malicious adv data check
Summary
In the Linux kernel, the following vulnerability has been resolved:
Bluetooth: refactor malicious adv data check
Check for out-of-bound read was being performed at the end of while
num_reports loop, and would fill journal with false positives. Added
check to beginning of loop processing so that it doesn't get checked
after ptr has been advanced.
Severity
8.1 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-06-20 13:36 UTC
Assigner
References
9 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
048acfa4daf167b007b6bd8bef474e90c2282a5f , < 305e92f525450f3e1b5f5c9dc7eadb152d66a082
(git)
Affected: 7d4238edd3bf8b8c75571cc3b382bc10438ac588 , < 7889b38a7f21ed19314f83194622b195d328465c (git) Affected: 185c77cbb53bc7481acc5a0b4e6119bbe393d561 , < 5a539c08d743d9910631448da78af5e961664c0e (git) Affected: 4a1491432394b22e585a185ffca49086e4046aae , < 8819f93cd4a443dfe547aa622b21f723757df3fb (git) Affected: 24161b9c43de966789d5956428f45002d10f878e , < 835d3706852537bf92eb23eb8635b8dee0c0aa67 (git) Affected: ffc9019bd991707701273c2e5d8aed472229fc4d , < 83d5196b65d1b29e27d7dd16a3b9b439fb1d2dba (git) Affected: 2de0e6a71ceb056e17e4684dce8b7640367996f9 , < bcea886771c3f22a590c8c8b9139a107bd7f1e1c (git) Affected: 640a476e38fce6c70c738ac09e5167e34f570303 , < 5c968affa804ba98c3c603f37ffea6fba618025e (git) Affected: 3a56ef719f0b9682afb8a86d64b2399e36faa4e6 , < 899663be5e75dc0174dc8bda0b5e6826edf0b29a (git) |
guessed | |
| Linux | Linux |
Affected:
4.4.300 , < 4.4.302
(semver)
Affected: 4.9.298 , < 4.9.300 (semver) Affected: 4.14.263 , < 4.14.265 (semver) Affected: 4.19.226 , < 4.19.228 (semver) Affected: 5.4.174 , < 5.4.176 (semver) Affected: 5.10.94 , < 5.10.96 (semver) Affected: 5.15.17 , < 5.15.19 (semver) Affected: 5.16.3 , < 5.16.5 (semver) |
guessed |
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"programFiles": [
"net/bluetooth/hci_event.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "4.4.302",
"status": "affected",
"version": "4.4.300",
"versionType": "semver"
},
{
"lessThan": "4.9.300",
"status": "affected",
"version": "4.9.298",
"versionType": "semver"
},
{
"lessThan": "4.14.265",
"status": "affected",
"version": "4.14.263",
"versionType": "semver"
},
{
"lessThan": "4.19.228",
"status": "affected",
"version": "4.19.226",
"versionType": "semver"
},
{
"lessThan": "5.4.176",
"status": "affected",
"version": "5.4.174",
"versionType": "semver"
},
{
"lessThan": "5.10.96",
"status": "affected",
"version": "5.10.94",
"versionType": "semver"
},
{
"lessThan": "5.15.19",
"status": "affected",
"version": "5.15.17",
"versionType": "semver"
},
{
"lessThan": "5.16.5",
"status": "affected",
"version": "5.16.3",
"versionType": "semver"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "4.4.302",
"versionStartIncluding": "4.4.300",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "4.9.300",
"versionStartIncluding": "4.9.298",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "4.14.265",
"versionStartIncluding": "4.14.263",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "4.19.228",
"versionStartIncluding": "4.19.226",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.4.176",
"versionStartIncluding": "5.4.174",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.10.96",
"versionStartIncluding": "5.10.94",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.19",
"versionStartIncluding": "5.15.17",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.16.5",
"versionStartIncluding": "5.16.3",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: refactor malicious adv data check\n\nCheck for out-of-bound read was being performed at the end of while\nnum_reports loop, and would fill journal with false positives. Added\ncheck to beginning of loop processing so that it doesn\u0027t get checked\nafter ptr has been advanced."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 8.1,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:A - The bug is in HCI LE Advertising Report parsing (hci_le_adv_report_evt), reached when a nearby BLE device\u2019s advertisements are delivered by the controller as HCI events\u2014the standard Adjacent Bluetooth path, not a host-local syscall-only interface.\nAC:L - A crafted advertising-report HCI event with num_reports/length inconsistent with the skb deterministically drives the loop into an out-of-bounds header read; the attacker controls the event contents (via RF advertising plus controller delivery, or an equivalent HCI source) with no uncontrollable race or rare layout dependency.\nPR:N - BLE advertising reports are processed without host authentication or local credentials; an unauthenticated adjacent Bluetooth peer needs no account or capability on the victim.\nUI:N - On typical phone/IoT deployments LE scanning runs in the background once Bluetooth is enabled, so reports are handled automatically with no extra victim action at exploit time.\nS:U - Impact is confined to the host kernel Bluetooth stack (slab over-read/possible oops) within the same OS security authority; there is no VM escape, IOMMU bypass, or other cross-boundary effect.\nC:H - With the check only after ptr advances, the next iteration can read hci_ev_le_advertising_info fields past skb_tail into adjacent slab memory (KASAN slab-OOB read); per guidance such OOB reads are Confidentiality High.\nI:N - This is a read-only out-of-bounds access of report headers; process_adv_report is gated by the in-loop length/tail checks and there is no OOB write, UAF, or control-flow hijack primitive.\nA:H - Reading past the skb kmalloc object can fault on unmapped/guarded memory and oops the kernel (as in the syzbot KASAN report on this path), which is scored Availability High."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-05T08:48:40.593Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/305e92f525450f3e1b5f5c9dc7eadb152d66a082"
},
{
"url": "https://git.kernel.org/stable/c/7889b38a7f21ed19314f83194622b195d328465c"
},
{
"url": "https://git.kernel.org/stable/c/5a539c08d743d9910631448da78af5e961664c0e"
},
{
"url": "https://git.kernel.org/stable/c/8819f93cd4a443dfe547aa622b21f723757df3fb"
},
{
"url": "https://git.kernel.org/stable/c/835d3706852537bf92eb23eb8635b8dee0c0aa67"
},
{
"url": "https://git.kernel.org/stable/c/83d5196b65d1b29e27d7dd16a3b9b439fb1d2dba"
},
{
"url": "https://git.kernel.org/stable/c/bcea886771c3f22a590c8c8b9139a107bd7f1e1c"
},
{
"url": "https://git.kernel.org/stable/c/5c968affa804ba98c3c603f37ffea6fba618025e"
},
{
"url": "https://git.kernel.org/stable/c/899663be5e75dc0174dc8bda0b5e6826edf0b29a"
}
],
"title": "Bluetooth: refactor malicious adv data check",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2021-47620",
"datePublished": "2024-06-20T11:08:09.320Z",
"dateReserved": "2024-06-20T11:03:43.235Z",
"dateUpdated": "2026-08-05T08:48:40.593Z",
"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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