CVE-2026-99008 (GCVE-0-2026-99008)
Vulnerability from cvelistv5
Published
2026-10-23 12:20
Modified
2026-10-30 12:40
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
Bluetooth: RFCOMM: Fix NULL tty_dev dereference in rfcomm_dev_shutdown
syzbot hit a NULL pointer dereference in rfcomm_dev_shutdown() when an
RFCOMM tty is closed.
rfcomm_dev_add() puts the new device on rfcomm_dev_list first and only
then registers the tty device and saves it in dev->tty_dev. If that
registration fails, dev->tty_dev is never set at all. The device can be
looked up in the meantime, so an open() of /dev/rfcommN gets through
rfcomm_tty_install() and attaches to it. When that tty is closed again,
rfcomm_dev_shutdown() uses dev->tty_dev without checking it:
Oops: general protection fault, probably for non-canonical address
KASAN: null-ptr-deref in range [0x0000000000000040-0x0000000000000047]
RIP: 0010:rfcomm_dev_shutdown+0x48/0xb0 net/bluetooth/rfcomm/tty.c:131
Call Trace:
tty_port_shutdown+0x1bf/0x220 drivers/tty/tty_port.c:372
tty_port_close+0x4e/0x150 drivers/tty/tty_port.c:705
tty_release+0x359/0x1670 drivers/tty/tty_io.c:1718
__fput+0x418/0xa50 fs/file_table.c:512
rfcomm_dev_destruct() already copes with a NULL dev->tty_dev. Add the
same check to rfcomm_dev_shutdown(), so the tty device is only moved
when it was actually registered.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: cad348a17e170451ea8688b532a6ca3e98c63b60 Version: cad348a17e170451ea8688b532a6ca3e98c63b60 Version: cad348a17e170451ea8688b532a6ca3e98c63b60 Version: cad348a17e170451ea8688b532a6ca3e98c63b60 Version: cad348a17e170451ea8688b532a6ca3e98c63b60 Version: cad348a17e170451ea8688b532a6ca3e98c63b60 Version: cad348a17e170451ea8688b532a6ca3e98c63b60 Version: cad348a17e170451ea8688b532a6ca3e98c63b60 |
||
{
"containers": {
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"product": "Linux",
"programFiles": [
"net/bluetooth/rfcomm/tty.c"
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},
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{
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{
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{
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},
{
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}
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}
],
"cpeApplicability": [
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],
"negate": false,
"operator": "OR"
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],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: RFCOMM: Fix NULL tty_dev dereference in rfcomm_dev_shutdown\n\nsyzbot hit a NULL pointer dereference in rfcomm_dev_shutdown() when an\nRFCOMM tty is closed.\n\nrfcomm_dev_add() puts the new device on rfcomm_dev_list first and only\nthen registers the tty device and saves it in dev-\u003etty_dev. If that\nregistration fails, dev-\u003etty_dev is never set at all. The device can be\nlooked up in the meantime, so an open() of /dev/rfcommN gets through\nrfcomm_tty_install() and attaches to it. When that tty is closed again,\nrfcomm_dev_shutdown() uses dev-\u003etty_dev without checking it:\n\n Oops: general protection fault, probably for non-canonical address\n KASAN: null-ptr-deref in range [0x0000000000000040-0x0000000000000047]\n RIP: 0010:rfcomm_dev_shutdown+0x48/0xb0 net/bluetooth/rfcomm/tty.c:131\n Call Trace:\n tty_port_shutdown+0x1bf/0x220 drivers/tty/tty_port.c:372\n tty_port_close+0x4e/0x150 drivers/tty/tty_port.c:705\n tty_release+0x359/0x1670 drivers/tty/tty_io.c:1718\n __fput+0x418/0xa50 fs/file_table.c:512\n\nrfcomm_dev_destruct() already copes with a NULL dev-\u003etty_dev. Add the\nsame check to rfcomm_dev_shutdown(), so the tty device is only moved\nwhen it was actually registered."
}
],
"providerMetadata": {
"dateUpdated": "2026-10-30T12:40:53.373Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/b2b915042be073637d9f93dc51ef15fc0685ae8a"
},
{
"url": "https://git.kernel.org/stable/c/a43452d8c1015ac2f0e43ff946be5425427b02cc"
},
{
"url": "https://git.kernel.org/stable/c/3f6394f6c6d1b6817065d3b402f55d437063a704"
},
{
"url": "https://git.kernel.org/stable/c/d5c372ad03330f02962d4860df4d355ab25487df"
},
{
"url": "https://git.kernel.org/stable/c/3fd5164bdb04635caa7942ddb554b0ec699a9433"
},
{
"url": "https://git.kernel.org/stable/c/a661f401f83b8462f2d424e0a1a72b7681e92ea2"
},
{
"url": "https://git.kernel.org/stable/c/d0aef0b0374678153244f162df507106d728af39"
},
{
"url": "https://git.kernel.org/stable/c/08e90633377f1b2567ab5ad6810b74c552246a07"
}
],
"title": "Bluetooth: RFCOMM: Fix NULL tty_dev dereference in rfcomm_dev_shutdown",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-99008",
"datePublished": "2026-10-23T12:20:33.355Z",
"dateReserved": "2026-09-25T10:25:14.385Z",
"dateUpdated": "2026-10-30T12:40:53.373Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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