FKIE_CVE-2026-90092
Vulnerability from fkie_nvd - Published: 2026-09-17 17:17 - Updated: 2026-09-18 18:17
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved:
Bluetooth: L2CAP: reject accept queue add unless BT_LISTEN
New sk should not be added to parent socket accept queue after last
l2cap_sock_cleanup_listen() has run in l2cap_sock_teardown_cb() and
state set to BT_CLOSED, as that can result to UAF on dereferencing the
dangling parent reference.
l2cap_sock_new_connection_cb() may race with parent l2cap_chan teardown,
due to chan->state accessed without consistent locking:
[Task 1] [Task 2]
l2cap_sock_release(parent) l2cap_connect
l2cap_sock_shutdown pchan = l2cap_global_chan_by_psm
l2cap_chan_lock(pchan)
l2cap_chan_close
l2cap_sock_teardown_cb
pchan->state = BT_CLOSED
l2cap_chan_unlock(pchan) ------> l2cap_chan_lock(pchan)
l2cap_new_connection
l2cap_sock_new_connection_cb
l2cap_chan_lock(pchan) <-------- l2cap_chan_unlock(pchan)
l2cap_sock_kill(parent) /* bt_sk(sk)->parent dangling */
Fix by adding check for sk_state == BT_LISTEN after acquiring sk lock in
l2cap_sock_new_connection_cb(). Add lock_sock() around sk_state writes
where missing, to avoid data races.
Although the data races on pchan->state should be fixed too, this
defensive sk_state check probably makes sense in any case.
References
Impacted products
| Vendor | Product | Version |
|---|
{
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"net/bluetooth/l2cap_sock.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "bf61a65c6093970e3b50031c4b79ebf3bd411eba",
"status": "affected",
"version": "0c17c8832562b2aac288e89cefd0f46074f54bcb",
"versionType": "git"
},
{
"lessThan": "491e4c60017969b053888029998d2a61f298986a",
"status": "affected",
"version": "5105f3e6b2df619c635b5f6a49fac131a36c7952",
"versionType": "git"
},
{
"lessThan": "2a3a27aaf19bf069720e024ce6fde54e6bf80df9",
"status": "affected",
"version": "c88c185ae0a1067823661b220aeea613df2c127b",
"versionType": "git"
},
{
"lessThan": "87276dc15b559d32757a43b4415c8445fbae06c4",
"status": "affected",
"version": "1810e42ff6716f320c7269d5850eca48b07b7427",
"versionType": "git"
},
{
"lessThan": "c47339e169bf4a0a4cfabb91351471f67744c2bc",
"status": "affected",
"version": "2ff1a41a912de8517b4482e946dd951b7d80edbf",
"versionType": "git"
},
{
"lessThan": "d4bfa78fd67929b62b02013c107973e0c5b7aa9a",
"status": "affected",
"version": "2ff1a41a912de8517b4482e946dd951b7d80edbf",
"versionType": "git"
},
{
"status": "affected",
"version": "1b1c0da227bf63479bac9982fc8d12df9aaea0fb",
"versionType": "git"
},
{
"status": "affected",
"version": "85426e97dc72f2088ba6d27e74cd58c3fbd43e31",
"versionType": "git"
},
{
"status": "affected",
"version": "a2dcf1a61d056aef15b63c6eae9441344d624389",
"versionType": "git"
},
{
"lessThan": "6.1.188",
"status": "affected",
"version": "6.1.175",
"versionType": "semver"
},
{
"lessThan": "6.6.157",
"status": "affected",
"version": "6.6.140",
"versionType": "semver"
},
{
"lessThan": "6.12.110",
"status": "affected",
"version": "6.12.88",
"versionType": "semver"
},
{
"lessThan": "6.18.52",
"status": "affected",
"version": "6.18.30",
"versionType": "semver"
},
{
"lessThan": "5.11",
"status": "affected",
"version": "5.10.258",
"versionType": "semver"
},
{
"lessThan": "5.16",
"status": "affected",
"version": "5.15.209",
"versionType": "semver"
},
{
"lessThan": "7.1",
"status": "affected",
"version": "7.0.7",
"versionType": "semver"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"net/bluetooth/l2cap_sock.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "7.1"
},
{
"lessThan": "7.1",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.188",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.157",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.110",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.52",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.2.*",
"status": "unaffected",
"version": "7.2.6",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.3-rc1",
"versionType": "original_commit_for_fix"
}
]
}
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: reject accept queue add unless BT_LISTEN\n\nNew sk should not be added to parent socket accept queue after last\nl2cap_sock_cleanup_listen() has run in l2cap_sock_teardown_cb() and\nstate set to BT_CLOSED, as that can result to UAF on dereferencing the\ndangling parent reference.\n\nl2cap_sock_new_connection_cb() may race with parent l2cap_chan teardown,\ndue to chan-\u003estate accessed without consistent locking:\n\n [Task 1] [Task 2]\n l2cap_sock_release(parent) l2cap_connect\n l2cap_sock_shutdown pchan = l2cap_global_chan_by_psm\n l2cap_chan_lock(pchan)\n l2cap_chan_close\n l2cap_sock_teardown_cb\n pchan-\u003estate = BT_CLOSED\n l2cap_chan_unlock(pchan) ------\u003e l2cap_chan_lock(pchan)\n l2cap_new_connection\n l2cap_sock_new_connection_cb\n l2cap_chan_lock(pchan) \u003c-------- l2cap_chan_unlock(pchan)\n l2cap_sock_kill(parent) /* bt_sk(sk)-\u003eparent dangling */\n\nFix by adding check for sk_state == BT_LISTEN after acquiring sk lock in\nl2cap_sock_new_connection_cb(). Add lock_sock() around sk_state writes\nwhere missing, to avoid data races.\n\nAlthough the data races on pchan-\u003estate should be fixed too, this\ndefensive sk_state check probably makes sense in any case."
}
],
"id": "CVE-2026-90092",
"lastModified": "2026-09-18T18:17:41.517",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "ADJACENT_NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 8.0,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"exploitabilityScore": 2.1,
"impactScore": 5.9,
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"type": "Secondary"
}
]
},
"published": "2026-09-17T17:17:00.757",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/2a3a27aaf19bf069720e024ce6fde54e6bf80df9"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/491e4c60017969b053888029998d2a61f298986a"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/87276dc15b559d32757a43b4415c8445fbae06c4"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/bf61a65c6093970e3b50031c4b79ebf3bd411eba"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/c47339e169bf4a0a4cfabb91351471f67744c2bc"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/d4bfa78fd67929b62b02013c107973e0c5b7aa9a"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Received"
}
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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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