CVE-2026-90092
Estado: RecibidaAlta (8)—
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:
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.
Leer descripción completaMostrar menos
Although the data races on pchan->state should be fixed too, this defensive sk_state check probably makes sense in any case.
Detalles técnicos trazas, registros y código del informe original
[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 */CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Puntuación base: 8
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.41%
- Percentil entre todas las CVEs puntuadas: 34
- Fecha de la puntuación: 5/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
🎯 Técnicas ATT&CK
Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.
- Explotación
T1210Exploitation of Remote Serviceslateral movement75 % - Impacto principal
T1499.004Application or System Exploitationimpact70 % - Impacto secundario
T1005Data from Local Systemcollection60 %
Vulnerabilidad de race condition en L2CAP del kernel Linux (AV:A, PR:L local) que permite escalada de privilegios y DoS por UAF al manipular el estado de conexión Bluetooth sin sincronización adecuada.
Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.
🛡️ Mitigaciones ATT&CK que cubren estas técnicas
Tecnologías afectadas (1)
⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.
Referencias
- https://git.kernel.org/stable/c/2a3a27aaf19bf069720e024ce6fde54e6bf80df9
- https://git.kernel.org/stable/c/491e4c60017969b053888029998d2a61f298986a
- https://git.kernel.org/stable/c/87276dc15b559d32757a43b4415c8445fbae06c4
- https://git.kernel.org/stable/c/bf61a65c6093970e3b50031c4b79ebf3bd411eba
- https://git.kernel.org/stable/c/c47339e169bf4a0a4cfabb91351471f67744c2bc
- https://git.kernel.org/stable/c/d4bfa78fd67929b62b02013c107973e0c5b7aa9a
JSON original (NVD)
Mostrar
{
"id": "CVE-2026-90092",
"cveTags": [],
"metrics": {
"cvssMetricV31": [
{
"type": "Secondary",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"cvssData": {
"scope": "UNCHANGED",
"version": "3.1",
"baseScore": 8,
"attackVector": "ADJACENT_NETWORK",
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"integrityImpact": "HIGH",
"userInteraction": "NONE",
"attackComplexity": "LOW",
"availabilityImpact": "HIGH",
"privilegesRequired": "LOW",
"confidentialityImpact": "HIGH"
},
"impactScore": 5.9,
"exploitabilityScore": 2.1
}
]
},
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "0c17c8832562b2aac288e89cefd0f46074f54bcb",
"lessThan": "bf61a65c6093970e3b50031c4b79ebf3bd411eba",
"versionType": "git"
},
{
"status": "affected",
"version": "5105f3e6b2df619c635b5f6a49fac131a36c7952",
"lessThan": "491e4c60017969b053888029998d2a61f298986a",
"versionType": "git"
},
{
"status": "affected",
"version": "c88c185ae0a1067823661b220aeea613df2c127b",
"lessThan": "2a3a27aaf19bf069720e024ce6fde54e6bf80df9",
"versionType": "git"
},
{
"status": "affected",
"version": "1810e42ff6716f320c7269d5850eca48b07b7427",
"lessThan": "87276dc15b559d32757a43b4415c8445fbae06c4",
"versionType": "git"
},
{
"status": "affected",
"version": "2ff1a41a912de8517b4482e946dd951b7d80edbf",
"lessThan": "c47339e169bf4a0a4cfabb91351471f67744c2bc",
"versionType": "git"
},
{
"status": "affected",
"version": "2ff1a41a912de8517b4482e946dd951b7d80edbf",
"lessThan": "d4bfa78fd67929b62b02013c107973e0c5b7aa9a",
"versionType": "git"
},
{
"status": "affected",
"version": "1b1c0da227bf63479bac9982fc8d12df9aaea0fb",
"versionType": "git"
},
{
"status": "affected",
"version": "85426e97dc72f2088ba6d27e74cd58c3fbd43e31",
"versionType": "git"
},
{
"status": "affected",
"version": "a2dcf1a61d056aef15b63c6eae9441344d624389",
"versionType": "git"
},
{
"status": "affected",
"version": "6.1.175",
"lessThan": "6.1.188",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.6.140",
"lessThan": "6.6.157",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.12.88",
"lessThan": "6.12.110",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.18.30",
"lessThan": "6.18.52",
"versionType": "semver"
},
{
"status": "affected",
"version": "5.10.258",
"lessThan": "5.11",
"versionType": "semver"
},
{
"status": "affected",
"version": "5.15.209",
"lessThan": "5.16",
"versionType": "semver"
},
{
"status": "affected",
"version": "7.0.7",
"lessThan": "7.1",
"versionType": "semver"
}
],
"programFiles": [
"net/bluetooth/l2cap_sock.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "7.1"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "7.1",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.1.188",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.157",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.110",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.52",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.6",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3-rc1",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/bluetooth/l2cap_sock.c"
],
"defaultStatus": "affected"
}
]
}
],
"published": "2026-09-17T17:17:00.757",
"references": [
{
"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",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Received",
"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->state 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->state = BT_CLOSED\n l2cap_chan_unlock(pchan) ------> l2cap_chan_lock(pchan)\n l2cap_new_connection\n l2cap_sock_new_connection_cb\n l2cap_chan_lock(pchan) <-------- l2cap_chan_unlock(pchan)\n l2cap_sock_kill(parent) /* bt_sk(sk)->parent 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->state should be fixed too, this\ndefensive sk_state check probably makes sense in any case."
}
],
"lastModified": "2026-09-18T18:17:41.517",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}