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vuln-cve/data/2026/90xxx/CVE-2026-90092.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-90092",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2026-09-11T19:38:34.786Z",
"datePublished": "2026-09-17T16:06:06.197Z",
"dateUpdated": "2026-10-19T08:57:50.446Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-10-19T08:57:50.446Z"
},
"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."
}
],
"metrics": [
{
"cvssV3_1": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"baseScore": 8,
"baseSeverity": "HIGH"
},
"scenarios": [
{
"lang": "en",
"value": "AV:A - The UAF is reached when a remote peer's L2CAP Connection Request (L2CAP_CONN_REQ, L2CAP_LE_CONN_REQ, or L2CAP_ECRED_CONN_REQ) is delivered via hci_acldata_packet() → l2cap_recv_acldata() → l2cap_recv_frame() into l2cap_connect()/l2cap_le_connect_req(), which calls l2cap_new_connection() → l2cap_sock_new_connection_cb(). Bluetooth radio range is adjacent.\nAC:L - The race is between the attacker's close() of their listening socket (l2cap_sock_release() → l2cap_sock_teardown_cb() setting BT_CLOSED, then l2cap_sock_kill()) and an in-flight L2CAP_CONN_REQ that already passed l2cap_global_chan_by_psm(BT_LISTEN) and is waiting on the chan lock. The attacker owns both sides and can retry.\nPR:L - Triggering the parent-free half requires owning the listener: l2cap_sock_create() has no capability check for SOCK_SEQPACKET/SOCK_STREAM, and l2cap_validate_le_psm()/l2cap_validate_bredr_psm() allow dynamic PSMs (≥0x0080 LE, ≥0x1001 BR/EDR) without CAP_NET_BIND_SERVICE. smp_sufficient_security() returns true at default BT_SECURITY_LOW, so the LE connect side needs no pairing.\nUI:N - The attacker close()s their own L2CAP listen fd and sends L2CAP Connection Requests from a radio they control; no victim pairing prompt, mount, or other user action is required to reach l2cap_sock_new_connection_cb() or the later l2cap_sock_ready_cb() dereference.\nS:U - The use-after-free corrupts the listening kernel struct sock in kmalloc-2k and stays within the kernel's own security authority; it is not a VM, IOMMU, or sandbox escape.\nC:H - syzbot KASAN reports a slab-use-after-free Read in l2cap_sock_ready_cb() of the parent sock already freed by l2cap_sock_release()→__sk_destruct(). The child's dangling bt_sk(sk)->parent is then used to load parent->sk_data_ready from the freed kmalloc-2k object, so spraying that cache discloses kernel memory.\nI:H - l2cap_sock_ready_cb() calls parent->sk_data_ready(parent) on the freed sock, hijacking a function pointer, and l2cap_sock_teardown_cb() may still run bt_accept_unlink() which list_del_init()s and writes sk_ack_backlog on that same freed parent, giving a write/CFI primitive.\nA:H - The same dangling-parent load in l2cap_sock_ready_cb() is a confirmed slab-use-after-free (syzbot KASAN splat from l2cap_info_timeout()→l2cap_chan_ready()) that oopses or panics the kernel even without a completed exploit."
}
]
}
],
"affected": [
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"net/bluetooth/l2cap_sock.c"
],
"versions": [
{
"version": "0c17c8832562b2aac288e89cefd0f46074f54bcb",
"lessThan": "bf61a65c6093970e3b50031c4b79ebf3bd411eba",
"status": "affected",
"versionType": "git"
},
{
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"lessThan": "491e4c60017969b053888029998d2a61f298986a",
"status": "affected",
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},
{
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"lessThan": "2a3a27aaf19bf069720e024ce6fde54e6bf80df9",
"status": "affected",
"versionType": "git"
},
{
"version": "1810e42ff6716f320c7269d5850eca48b07b7427",
"lessThan": "87276dc15b559d32757a43b4415c8445fbae06c4",
"status": "affected",
"versionType": "git"
},
{
"version": "2ff1a41a912de8517b4482e946dd951b7d80edbf",
"lessThan": "c47339e169bf4a0a4cfabb91351471f67744c2bc",
"status": "affected",
"versionType": "git"
},
{
"version": "2ff1a41a912de8517b4482e946dd951b7d80edbf",
"lessThan": "d4bfa78fd67929b62b02013c107973e0c5b7aa9a",
"status": "affected",
"versionType": "git"
},
{
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"status": "affected",
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},
{
"version": "85426e97dc72f2088ba6d27e74cd58c3fbd43e31",
"status": "affected",
"versionType": "git"
},
{
"version": "a2dcf1a61d056aef15b63c6eae9441344d624389",
"status": "affected",
"versionType": "git"
},
{
"version": "6.1.175",
"lessThan": "6.1.188",
"status": "affected",
"versionType": "semver"
},
{
"version": "6.6.140",
"lessThan": "6.6.157",
"status": "affected",
"versionType": "semver"
},
{
"version": "6.12.88",
"lessThan": "6.12.110",
"status": "affected",
"versionType": "semver"
},
{
"version": "6.18.30",
"lessThan": "6.18.52",
"status": "affected",
"versionType": "semver"
},
{
"version": "5.10.258",
"lessThan": "5.11",
"status": "affected",
"versionType": "semver"
},
{
"version": "5.15.209",
"lessThan": "5.16",
"status": "affected",
"versionType": "semver"
},
{
"version": "7.0.7",
"lessThan": "7.1",
"status": "affected",
"versionType": "semver"
}
]
},
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "affected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"net/bluetooth/l2cap_sock.c"
],
"versions": [
{
"version": "7.1",
"status": "affected"
},
{
"version": "0",
"lessThan": "7.1",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.1.188",
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.6.157",
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.12.110",
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.18.52",
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "7.2.6",
"lessThanOrEqual": "7.2.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "7.3",
"lessThanOrEqual": "*",
"status": "unaffected",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"operator": "OR",
"negate": false,
"cpeMatch": [
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "6.1.175",
"versionEndExcluding": "6.1.188"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "6.6.140",
"versionEndExcluding": "6.6.157"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "6.12.88",
"versionEndExcluding": "6.12.110"
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{
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "6.18.30",
"versionEndExcluding": "6.18.52"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "7.1",
"versionEndExcluding": "7.2.6"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "7.1",
"versionEndExcluding": "7.3"
},
{
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "5.10.258"
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "5.15.209"
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"versionStartIncluding": "7.0.7"
}
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]
}
],
"references": [
{
"url": "https://git.kernel.org/stable/c/bf61a65c6093970e3b50031c4b79ebf3bd411eba"
},
{
"url": "https://git.kernel.org/stable/c/491e4c60017969b053888029998d2a61f298986a"
},
{
"url": "https://git.kernel.org/stable/c/2a3a27aaf19bf069720e024ce6fde54e6bf80df9"
},
{
"url": "https://git.kernel.org/stable/c/87276dc15b559d32757a43b4415c8445fbae06c4"
},
{
"url": "https://git.kernel.org/stable/c/c47339e169bf4a0a4cfabb91351471f67744c2bc"
},
{
"url": "https://git.kernel.org/stable/c/d4bfa78fd67929b62b02013c107973e0c5b7aa9a"
}
],
"title": "Bluetooth: L2CAP: reject accept queue add unless BT_LISTEN",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
}
}
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