CVE-2026-53073 (GCVE-0-2026-53073)
Vulnerability from cvelistv5 – Published: 2026-06-24 16:30 – Updated: 2026-06-24 16:30
VLAI
EPSS
VEX
Title
Bluetooth: hci_ldisc: Clear HCI_UART_PROTO_INIT on error
Summary
In the Linux kernel, the following vulnerability has been resolved:
Bluetooth: hci_ldisc: Clear HCI_UART_PROTO_INIT on error
When hci_register_dev() fails in hci_uart_register_dev()
HCI_UART_PROTO_INIT is not cleared before calling hu->proto->close(hu)
and setting hu->hdev to NULL. This means incoming UART data will reach
the protocol-specific recv handler in hci_uart_tty_receive() after
resources are freed.
Clear HCI_UART_PROTO_INIT with a write lock before calling
hu->proto->close() and setting hu->hdev to NULL. The write lock ensures
all active readers have completed and no new reader can enter the
protocol recv path before resources are freed.
This allows the protocol-specific recv functions to remove the
"HCI_UART_REGISTERED" guard without risking a null pointer dereference
if hci_register_dev() fails.
Severity
5.5 (Medium)
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
a40f94f7caa8d3421b64f63ac31bc0f24c890f39 , < ebb39b2d81731b83ee71a1ba6dd0291a57b5ac07
(git)
Affected: 9e5a0f5777162e503400c70c6ed25fbbe2d38799 , < ed4033fb85ccaaf6c3983be3c7b037e48253d232 (git) Affected: 80f14e9de6a43a0bd8194cad1003a3e6dcbc3984 , < 356dee1bcac4d0d9152390561fa63331ebff211b (git) Affected: 02e1bcdfdf769974e7e9fa285e295cd9852e2a38 , < a673cf6c4ac702cb79ac1f4d7fc4de763a6a3e40 (git) Affected: 281782d2c6730241e300d630bb9f200d831ede71 , < f4b69c35813c432973d340d3600c01de106ed474 (git) Affected: 5df5dafc171b90d0b8d51547a82657cd5a1986c7 , < 3daa5818e473ed60eb69d8b5c71b651909d28c5a (git) Affected: 5df5dafc171b90d0b8d51547a82657cd5a1986c7 , < 194f029a4d7f739e44ebc1f473120187b4de5104 (git) Affected: 5df5dafc171b90d0b8d51547a82657cd5a1986c7 , < 68d39ea5e0adc9ecaea1ce8abd842ec972eb8718 (git) Affected: 1dcf08fcff5ca529de6dc0395091f28854f4e54a (git) Affected: 8e5aff600539e5faea294d9612cca50220e602b8 (git) Affected: db7509fa110dd9b11134b75894677f30353b2c51 (git) Affected: 5.10.237 , < 5.10.258 (semver) Affected: 5.15.181 , < 5.15.209 (semver) Affected: 6.1.135 , < 6.1.175 (semver) Affected: 6.6.88 , < 6.6.141 (semver) Affected: 6.12.24 , < 6.12.91 (semver) Affected: 5.4.293 , < 5.5 (semver) Affected: 6.13.12 , < 6.14 (semver) Affected: 6.14.3 , < 6.15 (semver) |
guessed | |
| Linux | Linux |
Affected:
6.15
Unaffected: 0 , < 6.15 (semver) Unaffected: 5.10.258 , ≤ 5.10.* (semver) Unaffected: 5.15.209 , ≤ 5.15.* (semver) Unaffected: 6.1.175 , ≤ 6.1.* (semver) Unaffected: 6.6.141 , ≤ 6.6.* (semver) Unaffected: 6.12.91 , ≤ 6.12.* (semver) Unaffected: 6.18.33 , ≤ 6.18.* (semver) Unaffected: 7.0.10 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix) |
guessed |
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"versionEndExcluding": "6.18.33",
"versionStartIncluding": "6.14.3",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "A13475D2-59BF-4716-94B5-7C1D239A2CF4",
"versionEndExcluding": "7.0.10",
"versionStartIncluding": "6.19",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_ldisc: Clear HCI_UART_PROTO_INIT on error\n\nWhen hci_register_dev() fails in hci_uart_register_dev()\nHCI_UART_PROTO_INIT is not cleared before calling hu-\u003eproto-\u003eclose(hu)\nand setting hu-\u003ehdev to NULL. This means incoming UART data will reach\nthe protocol-specific recv handler in hci_uart_tty_receive() after\nresources are freed.\n\nClear HCI_UART_PROTO_INIT with a write lock before calling\nhu-\u003eproto-\u003eclose() and setting hu-\u003ehdev to NULL. The write lock ensures\nall active readers have completed and no new reader can enter the\nprotocol recv path before resources are freed.\n\nThis allows the protocol-specific recv functions to remove the\n\"HCI_UART_REGISTERED\" guard without risking a null pointer dereference\nif hci_register_dev() fails."
}
],
"id": "CVE-2026-53073",
"lastModified": "2026-07-21T18:05:01.443",
"metrics": {
"cvssMetricV31": [
{
"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"
}
]
},
"published": "2026-06-24T17:17:21.163",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/194f029a4d7f739e44ebc1f473120187b4de5104"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/356dee1bcac4d0d9152390561fa63331ebff211b"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/3daa5818e473ed60eb69d8b5c71b651909d28c5a"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/68d39ea5e0adc9ecaea1ce8abd842ec972eb8718"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/a673cf6c4ac702cb79ac1f4d7fc4de763a6a3e40"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/ebb39b2d81731b83ee71a1ba6dd0291a57b5ac07"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/ed4033fb85ccaaf6c3983be3c7b037e48253d232"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/f4b69c35813c432973d340d3600c01de106ed474"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Analyzed",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-476"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-09-04T08:01:10+00:00",
"cve": "CVE-2026-53073",
"id": "CVE-2026-53073",
"initial_release_date": "2026-06-24T00:00:00+00:00",
"product_status:fixed": "612",
"product_status:known_affected": "22",
"product_status:known_not_affected": "90",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: Bluetooth: hci_ldisc: Clear HCI_UART_PROTO_INIT on error",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53073.json",
"version": "3"
}
}
}
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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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