CVE-2025-40308 (GCVE-0-2025-40308)
Vulnerability from cvelistv5 – Published: 2025-12-08 00:46 – Updated: 2026-05-23 16:02
VLAI
EPSS
VEX
Title
Bluetooth: bcsp: receive data only if registered
Summary
In the Linux kernel, the following vulnerability has been resolved:
Bluetooth: bcsp: receive data only if registered
Currently, bcsp_recv() can be called even when the BCSP protocol has not
been registered. This leads to a NULL pointer dereference, as shown in
the following stack trace:
KASAN: null-ptr-deref in range [0x0000000000000108-0x000000000000010f]
RIP: 0010:bcsp_recv+0x13d/0x1740 drivers/bluetooth/hci_bcsp.c:590
Call Trace:
<TASK>
hci_uart_tty_receive+0x194/0x220 drivers/bluetooth/hci_ldisc.c:627
tiocsti+0x23c/0x2c0 drivers/tty/tty_io.c:2290
tty_ioctl+0x626/0xde0 drivers/tty/tty_io.c:2706
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:907 [inline]
__se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
To prevent this, ensure that the HCI_UART_REGISTERED flag is set before
processing received data. If the protocol is not registered, return
-EUNATCH.
Severity
No CVSS data available.
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
48effdb7a798232db945503cf3f51e0be8070cea , < 39a7d40314b6288cfa2d13269275e9247a7a055a
(git)
Affected: 45fa7bd82c6178f4fec0ab94891144a043ec5fe8 , < 164586725b47f9d61912e6bf17dbaffeff11710b (git) Affected: d71a57a34ab6bbc95dc461158403c02e8ff3f912 , < b65ca9708bfbf47d8b7bd44b7c574bd16798e9c9 (git) Affected: 9cf7dccaa7f4c56d2089700e5cb11f85a8d5f6cf , < 8b892dbef3887dbe9afdc7176d1a5fd90e1636aa (git) Affected: 806464634e7fc6b523160defeeddb1ade2a72f81 , < 799cd62cbcc3f12ee04b33ef390ff7d41c37d671 (git) Affected: 6b7a32fa9bacdebd98c18b2a56994116995ee643 , < b420a4c7f915fc1c94ad1f6ca740acc046d94334 (git) Affected: 366ceff495f902182d42b6f41525c2474caf3f9a , < 55c1519fca830f59a10bbf9aa8209c87b06cf7bc (git) Affected: 366ceff495f902182d42b6f41525c2474caf3f9a , < ca94b2b036c22556c3a66f1b80f490882deef7a6 (git) Affected: 15543b7bbe7b5f744fdbb44f75b14f81a0117813 (git) Affected: a4b89a45b12b69bc82c8137346b150a118e02c26 (git) Affected: 5.4.293 , < 5.4.302 (semver) Affected: 5.10.237 , < 5.10.247 (semver) Affected: 5.15.181 , < 5.15.197 (semver) Affected: 6.1.135 , < 6.1.159 (semver) Affected: 6.6.88 , < 6.6.117 (semver) Affected: 6.12.24 , < 6.12.58 (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: 5.4.302 , ≤ 5.4.* (semver) Unaffected: 5.10.247 , ≤ 5.10.* (semver) Unaffected: 5.15.197 , ≤ 5.15.* (semver) Unaffected: 6.1.159 , ≤ 6.1.* (semver) Unaffected: 6.6.117 , ≤ 6.6.* (semver) Unaffected: 6.12.58 , ≤ 6.12.* (semver) Unaffected: 6.17.8 , ≤ 6.17.* (semver) Unaffected: 6.18 , ≤ * (original_commit_for_fix) |
guessed |
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"drivers/bluetooth/hci_bcsp.c"
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},
{
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"status": "affected",
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"versionType": "semver"
},
{
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"status": "affected",
"version": "5.15.181",
"versionType": "semver"
},
{
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"status": "affected",
"version": "6.1.135",
"versionType": "semver"
},
{
"lessThan": "6.6.117",
"status": "affected",
"version": "6.6.88",
"versionType": "semver"
},
{
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"status": "affected",
"version": "6.12.24",
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},
{
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"version": "6.13.12",
"versionType": "semver"
},
{
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"versionType": "semver"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"drivers/bluetooth/hci_bcsp.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "6.15"
},
{
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"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.4.*",
"status": "unaffected",
"version": "5.4.302",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.247",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.197",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.159",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.117",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.58",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.17.*",
"status": "unaffected",
"version": "6.17.8",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "6.18",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.4.302",
"versionStartIncluding": "5.4.293",
"vulnerable": true
},
{
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},
{
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"versionStartIncluding": "5.15.181",
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},
{
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"versionEndExcluding": "6.1.159",
"versionStartIncluding": "6.1.135",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.117",
"versionStartIncluding": "6.6.88",
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},
{
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},
{
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"versionEndExcluding": "6.17.8",
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},
{
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},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "6.13.12",
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},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "6.14.3",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: bcsp: receive data only if registered\n\nCurrently, bcsp_recv() can be called even when the BCSP protocol has not\nbeen registered. This leads to a NULL pointer dereference, as shown in\nthe following stack trace:\n\n KASAN: null-ptr-deref in range [0x0000000000000108-0x000000000000010f]\n RIP: 0010:bcsp_recv+0x13d/0x1740 drivers/bluetooth/hci_bcsp.c:590\n Call Trace:\n \u003cTASK\u003e\n hci_uart_tty_receive+0x194/0x220 drivers/bluetooth/hci_ldisc.c:627\n tiocsti+0x23c/0x2c0 drivers/tty/tty_io.c:2290\n tty_ioctl+0x626/0xde0 drivers/tty/tty_io.c:2706\n vfs_ioctl fs/ioctl.c:51 [inline]\n __do_sys_ioctl fs/ioctl.c:907 [inline]\n __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nTo prevent this, ensure that the HCI_UART_REGISTERED flag is set before\nprocessing received data. If the protocol is not registered, return\n-EUNATCH."
}
],
"providerMetadata": {
"dateUpdated": "2026-05-23T16:02:02.594Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/39a7d40314b6288cfa2d13269275e9247a7a055a"
},
{
"url": "https://git.kernel.org/stable/c/164586725b47f9d61912e6bf17dbaffeff11710b"
},
{
"url": "https://git.kernel.org/stable/c/b65ca9708bfbf47d8b7bd44b7c574bd16798e9c9"
},
{
"url": "https://git.kernel.org/stable/c/8b892dbef3887dbe9afdc7176d1a5fd90e1636aa"
},
{
"url": "https://git.kernel.org/stable/c/799cd62cbcc3f12ee04b33ef390ff7d41c37d671"
},
{
"url": "https://git.kernel.org/stable/c/b420a4c7f915fc1c94ad1f6ca740acc046d94334"
},
{
"url": "https://git.kernel.org/stable/c/55c1519fca830f59a10bbf9aa8209c87b06cf7bc"
},
{
"url": "https://git.kernel.org/stable/c/ca94b2b036c22556c3a66f1b80f490882deef7a6"
}
],
"title": "Bluetooth: bcsp: receive data only if registered",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2025-40308",
"datePublished": "2025-12-08T00:46:33.729Z",
"dateReserved": "2025-04-16T07:20:57.185Z",
"dateUpdated": "2026-05-23T16:02:02.594Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2025-40308",
"date": "2026-10-31",
"epss": "0.00195",
"percentile": "0.09293"
},
"microsoft_vex": {
"current_release_date": "2025-12-16T14:38:38.000Z",
"cve": "CVE-2025-40308",
"id": "msrc_CVE-2025-40308",
"initial_release_date": "2025-12-02T00:00:00.000Z",
"product_status:fixed": "1",
"product_status:known_affected": "1",
"source": "Microsoft CSAF VEX",
"status": "final",
"title": "Bluetooth: bcsp: receive data only if registered",
"url": "https://msrc.microsoft.com/csaf/vex/2025/msrc_cve-2025-40308.json",
"version": "2"
},
"nvd": {
"cve": {
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"drivers/bluetooth/hci_bcsp.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "39a7d40314b6288cfa2d13269275e9247a7a055a",
"status": "affected",
"version": "48effdb7a798232db945503cf3f51e0be8070cea",
"versionType": "git"
},
{
"lessThan": "164586725b47f9d61912e6bf17dbaffeff11710b",
"status": "affected",
"version": "45fa7bd82c6178f4fec0ab94891144a043ec5fe8",
"versionType": "git"
},
{
"lessThan": "b65ca9708bfbf47d8b7bd44b7c574bd16798e9c9",
"status": "affected",
"version": "d71a57a34ab6bbc95dc461158403c02e8ff3f912",
"versionType": "git"
},
{
"lessThan": "8b892dbef3887dbe9afdc7176d1a5fd90e1636aa",
"status": "affected",
"version": "9cf7dccaa7f4c56d2089700e5cb11f85a8d5f6cf",
"versionType": "git"
},
{
"lessThan": "799cd62cbcc3f12ee04b33ef390ff7d41c37d671",
"status": "affected",
"version": "806464634e7fc6b523160defeeddb1ade2a72f81",
"versionType": "git"
},
{
"lessThan": "b420a4c7f915fc1c94ad1f6ca740acc046d94334",
"status": "affected",
"version": "6b7a32fa9bacdebd98c18b2a56994116995ee643",
"versionType": "git"
},
{
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"status": "affected",
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{
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{
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"versionType": "git"
},
{
"status": "affected",
"version": "a4b89a45b12b69bc82c8137346b150a118e02c26",
"versionType": "git"
},
{
"lessThan": "5.4.302",
"status": "affected",
"version": "5.4.293",
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},
{
"lessThan": "5.10.247",
"status": "affected",
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"versionType": "semver"
},
{
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"status": "affected",
"version": "5.15.181",
"versionType": "semver"
},
{
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"status": "affected",
"version": "6.1.135",
"versionType": "semver"
},
{
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"status": "affected",
"version": "6.6.88",
"versionType": "semver"
},
{
"lessThan": "6.12.58",
"status": "affected",
"version": "6.12.24",
"versionType": "semver"
},
{
"lessThan": "6.14",
"status": "affected",
"version": "6.13.12",
"versionType": "semver"
},
{
"lessThan": "6.15",
"status": "affected",
"version": "6.14.3",
"versionType": "semver"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"drivers/bluetooth/hci_bcsp.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "6.15"
},
{
"lessThan": "6.15",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.4.*",
"status": "unaffected",
"version": "5.4.302",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.247",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.197",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.159",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.117",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.58",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.17.*",
"status": "unaffected",
"version": "6.17.8",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "6.18",
"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: bcsp: receive data only if registered\n\nCurrently, bcsp_recv() can be called even when the BCSP protocol has not\nbeen registered. This leads to a NULL pointer dereference, as shown in\nthe following stack trace:\n\n KASAN: null-ptr-deref in range [0x0000000000000108-0x000000000000010f]\n RIP: 0010:bcsp_recv+0x13d/0x1740 drivers/bluetooth/hci_bcsp.c:590\n Call Trace:\n \u003cTASK\u003e\n hci_uart_tty_receive+0x194/0x220 drivers/bluetooth/hci_ldisc.c:627\n tiocsti+0x23c/0x2c0 drivers/tty/tty_io.c:2290\n tty_ioctl+0x626/0xde0 drivers/tty/tty_io.c:2706\n vfs_ioctl fs/ioctl.c:51 [inline]\n __do_sys_ioctl fs/ioctl.c:907 [inline]\n __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nTo prevent this, ensure that the HCI_UART_REGISTERED flag is set before\nprocessing received data. If the protocol is not registered, return\n-EUNATCH."
},
{
"lang": "es",
"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nBluetooth: bcsp: recibir datos solo si est\u00e1 registrado\n\nActualmente, bcsp_recv() puede ser llamado incluso cuando el protocolo BCSP no ha sido registrado. Esto lleva a una desreferencia de puntero NULL, como se muestra en el siguiente rastreo de pila:\n\n KASAN: null-ptr-deref in range [0x0000000000000108-0x000000000000010f]\n RIP: 0010:bcsp_recv+0x13d/0x1740 drivers/bluetooth/hci_bcsp.c:590\n Call Trace:\n \u003cTASK\u003e\n hci_uart_tty_receive+0x194/0x220 drivers/bluetooth/hci_ldisc.c:627\n tiocsti+0x23c/0x2c0 drivers/tty/tty_io.c:2290\n tty_ioctl+0x626/0xde0 drivers/tty/tty_io.c:2706\n vfs_ioctl fs/ioctl.c:51 [inline]\n __do_sys_ioctl fs/ioctl.c:907 [inline]\n __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nPara evitar esto, aseg\u00farese de que el indicador HCI_UART_REGISTERED est\u00e9 establecido antes de procesar los datos recibidos. Si el protocolo no est\u00e1 registrado, devuelva -EUNATCH."
}
],
"id": "CVE-2025-40308",
"lastModified": "2026-10-14T22:10:00.210",
"metrics": {},
"published": "2025-12-08T01:16:03.073",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/164586725b47f9d61912e6bf17dbaffeff11710b"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/39a7d40314b6288cfa2d13269275e9247a7a055a"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/55c1519fca830f59a10bbf9aa8209c87b06cf7bc"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/799cd62cbcc3f12ee04b33ef390ff7d41c37d671"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/8b892dbef3887dbe9afdc7176d1a5fd90e1636aa"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/b420a4c7f915fc1c94ad1f6ca740acc046d94334"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/b65ca9708bfbf47d8b7bd44b7c574bd16798e9c9"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/ca94b2b036c22556c3a66f1b80f490882deef7a6"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Deferred"
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-06-30T10:19:46+00:00",
"cve": "CVE-2025-40308",
"id": "CVE-2025-40308",
"initial_release_date": "2025-12-08T00:00:00+00:00",
"product_status:known_affected": "274",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: Bluetooth: bcsp: receive data only if registered",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-40308.json",
"version": "3"
}
}
}
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Sightings
| Author | Source | Type | Date | Other |
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Nomenclature
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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.