CVE-2026-23395 (GCVE-0-2026-23395)
Vulnerability from cvelistv5 – Published: 2026-03-25 10:33 – Updated: 2026-08-05 12:21
VLAI
EPSS
VEX
Title
Bluetooth: L2CAP: Fix accepting multiple L2CAP_ECRED_CONN_REQ
Summary
In the Linux kernel, the following vulnerability has been resolved:
Bluetooth: L2CAP: Fix accepting multiple L2CAP_ECRED_CONN_REQ
Currently the code attempts to accept requests regardless of the
command identifier which may cause multiple requests to be marked
as pending (FLAG_DEFER_SETUP) which can cause more than
L2CAP_ECRED_MAX_CID(5) to be allocated in l2cap_ecred_rsp_defer
causing an overflow.
The spec is quite clear that the same identifier shall not be used on
subsequent requests:
'Within each signaling channel a different Identifier shall be used
for each successive request or indication.'
https://www.bluetooth.com/wp-content/uploads/Files/Specification/HTML/Core-62/out/en/host/logical-link-control-and-adaptation-protocol-specification.html#UUID-32a25a06-4aa4-c6c7-77c5-dcfe3682355d
So this attempts to check if there are any channels pending with the
same identifier and rejects if any are found.
Severity
8.8 (High)
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
15f02b91056253e8cdc592888f431da0731337b8 , < 10a7a702542240d5edb2b39450ac951c59ccd009
(git)
Affected: 15f02b91056253e8cdc592888f431da0731337b8 , < 46e5b71666fb7652082e4e214a3365f4b14f1dc3 (git) Affected: 15f02b91056253e8cdc592888f431da0731337b8 , < fb4a3a26483f3ea2cd21c7a2f7c45d5670600465 (git) Affected: 15f02b91056253e8cdc592888f431da0731337b8 , < 2124d82fd25e1671bb3ceb37998af5aae5903e06 (git) Affected: 15f02b91056253e8cdc592888f431da0731337b8 , < 6b949a6b33cbdf621d9fc6f0c48ac00915dbf514 (git) Affected: 15f02b91056253e8cdc592888f431da0731337b8 , < 8d0d94f8ba5b3a0beec3b0da558b9bea48018117 (git) Affected: 15f02b91056253e8cdc592888f431da0731337b8 , < e72ee455297b794b852e5cea8d2d7bb17312172a (git) Affected: 15f02b91056253e8cdc592888f431da0731337b8 , < 5b3e2052334f2ff6d5200e952f4aa66994d09899 (git) |
guessed | |
| Linux | Linux |
Affected:
5.7
Unaffected: 0 , < 5.7 (semver) Unaffected: 5.10.253 , ≤ 5.10.* (semver) Unaffected: 5.15.203 , ≤ 5.15.* (semver) Unaffected: 6.1.167 , ≤ 6.1.* (semver) Unaffected: 6.6.130 , ≤ 6.6.* (semver) Unaffected: 6.12.78 , ≤ 6.12.* (semver) Unaffected: 6.18.20 , ≤ 6.18.* (semver) Unaffected: 6.19.10 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix) |
guessed |
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{
"lang": "es",
"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nBluetooth: L2CAP: Correcci\u00f3n para aceptar m\u00faltiples L2CAP_ECRED_CONN_REQ\n\nActualmente, el c\u00f3digo intenta aceptar solicitudes independientemente del identificador de comando, lo que puede hacer que m\u00faltiples solicitudes se marquen como pendientes (FLAG_DEFER_SETUP), lo que puede causar que se asignen m\u00e1s de L2CAP_ECRED_MAX_CID(5) en l2cap_ecred_rsp_defer, causando un desbordamiento.\n\nLa especificaci\u00f3n es bastante clara en que el mismo identificador no debe usarse en solicitudes subsiguientes:\n\n\u0027Dentro de cada canal de se\u00f1alizaci\u00f3n se utilizar\u00e1 un identificador diferente para cada solicitud o indicaci\u00f3n sucesiva.\u0027\nhttps://www.bluetooth.com/wp-content/uploads/Files/Specification/HTML/Core-62/out/en/host/logical-link-control-and-adaptation-protocol-specification.html#UUID-32a25a06-4aa4-c6c7-77c5-dcfe3682355d\n\nAs\u00ed que esto intenta verificar si hay canales pendientes con el mismo identificador y los rechaza si se encuentra alguno."
}
],
"id": "CVE-2026-23395",
"lastModified": "2026-06-17T10:21:29.840",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "ADJACENT_NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 8.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"exploitabilityScore": 2.8,
"impactScore": 5.9,
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"type": "Secondary"
},
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "ADJACENT_NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 8.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"exploitabilityScore": 2.8,
"impactScore": 5.9,
"source": "nvd@nist.gov",
"type": "Primary"
}
]
},
"published": "2026-03-25T11:16:40.347",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/10a7a702542240d5edb2b39450ac951c59ccd009"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/2124d82fd25e1671bb3ceb37998af5aae5903e06"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/46e5b71666fb7652082e4e214a3365f4b14f1dc3"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/5b3e2052334f2ff6d5200e952f4aa66994d09899"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/6b949a6b33cbdf621d9fc6f0c48ac00915dbf514"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/8d0d94f8ba5b3a0beec3b0da558b9bea48018117"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/e72ee455297b794b852e5cea8d2d7bb17312172a"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/fb4a3a26483f3ea2cd21c7a2f7c45d5670600465"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Analyzed",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "NVD-CWE-noinfo"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-07-02T17:12:40+00:00",
"cve": "CVE-2026-23395",
"id": "CVE-2026-23395",
"initial_release_date": "2026-03-25T00:00:00+00:00",
"product_status:known_affected": "232",
"product_status:known_not_affected": "42",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: Bluetooth: L2CAP: Fix accepting multiple L2CAP_ECRED_CONN_REQ",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23395.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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