CVE-2026-99015 (GCVE-0-2026-99015)
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: hci_sock: Serialize dead-device detachment
Rebinding an HCI socket after its controller is unregistered can race
monitor control replay and crash the kernel. hci_sock_bind() clears
hci_pi(sk)->hdev and drops the device reference under only the socket
lock, whereas send_monitor_control_replay() holds hci_sk_list.lock for
reading.
Replay can observe a non-NULL hdev, then bind can clear it and drop the
last reference before create_monitor_ctrl_open() reads hdev->id. This
can cause a NULL pointer dereference if the pointer is reloaded, or a
use-after-free if the old pointer is retained.
The kernel reported:
KASAN: null-ptr-deref in range [0x0000000000000068-0x000000000000006f]
RIP: 0010:create_monitor_ctrl_open+0x579/0x800
Call Trace:
hci_sock_bind+0xd96/0x1190
__sys_bind+0x166/0x200
__x64_sys_bind+0x6d/0xb0
do_syscall_64+0xdd/0x4a0
entry_SYSCALL_64_after_hwframe+0x77/0x7f
The same missing serialization lets hci_send_to_sock() select a socket
for the old device and queue its frame after bind has detached the socket
or installed a new binding.
Take hci_sk_list.lock for writing when clearing the device pointer and
resetting the socket state. This waits for existing replay and delivery
readers to finish before detachment and prevents later readers from
using the old binding. Keep hci_dev_put() outside the critical section
because the final device release can sleep.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: f2f856b65ac4b77049c76c0e89ecd3a177e9fcd1 Version: e04480920d1eec9c061841399aa6f35b6f987d8b Version: e04480920d1eec9c061841399aa6f35b6f987d8b Version: e04480920d1eec9c061841399aa6f35b6f987d8b Version: e04480920d1eec9c061841399aa6f35b6f987d8b Version: e04480920d1eec9c061841399aa6f35b6f987d8b Version: e04480920d1eec9c061841399aa6f35b6f987d8b Version: e04480920d1eec9c061841399aa6f35b6f987d8b Version: d6ef8bb00aa65eceb413fc165a55086459863e38 Version: 0e77f979a97d3d517fad0b51249ba6fb8ae2d365 Version: 0782c8c7f80c9dd457acdfe16fd0f339f0e73093 Version: 3719acc161d5c1ce09912cc1c9eddc2c5faa3c66 Version: ff29fe26ab8679bc13a3f0bf5b2911535a1cfc35 Version: 75dd00b755ebfa9b24eaedc9f42e9adfc00ae00c Version: 5.10.58 ≤ Version: 4.4.281 ≤ Version: 4.9.280 ≤ Version: 4.14.244 ≤ Version: 4.19.203 ≤ Version: 5.4.140 ≤ Version: 5.13.10 ≤ |
||
{
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"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_sock: Serialize dead-device detachment\n\nRebinding an HCI socket after its controller is unregistered can race\nmonitor control replay and crash the kernel. hci_sock_bind() clears\nhci_pi(sk)-\u003ehdev and drops the device reference under only the socket\nlock, whereas send_monitor_control_replay() holds hci_sk_list.lock for\nreading.\n\nReplay can observe a non-NULL hdev, then bind can clear it and drop the\nlast reference before create_monitor_ctrl_open() reads hdev-\u003eid. This\ncan cause a NULL pointer dereference if the pointer is reloaded, or a\nuse-after-free if the old pointer is retained.\n\nThe kernel reported:\n\n KASAN: null-ptr-deref in range [0x0000000000000068-0x000000000000006f]\n RIP: 0010:create_monitor_ctrl_open+0x579/0x800\n Call Trace:\n hci_sock_bind+0xd96/0x1190\n __sys_bind+0x166/0x200\n __x64_sys_bind+0x6d/0xb0\n do_syscall_64+0xdd/0x4a0\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nThe same missing serialization lets hci_send_to_sock() select a socket\nfor the old device and queue its frame after bind has detached the socket\nor installed a new binding.\n\nTake hci_sk_list.lock for writing when clearing the device pointer and\nresetting the socket state. This waits for existing replay and delivery\nreaders to finish before detachment and prevents later readers from\nusing the old binding. Keep hci_dev_put() outside the critical section\nbecause the final device release can sleep."
}
],
"providerMetadata": {
"dateUpdated": "2026-10-30T12:40:57.696Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/88f47e66b1a6e0bfc350676937f3b552b434e74c"
},
{
"url": "https://git.kernel.org/stable/c/304adbdb96b0491c2b377e216b0bf417fc8e69a9"
},
{
"url": "https://git.kernel.org/stable/c/362126f739889436048f5573ebc87466d2525fd9"
},
{
"url": "https://git.kernel.org/stable/c/37cef0c8fb537f40600910d2c2e5f2d5509305f3"
},
{
"url": "https://git.kernel.org/stable/c/76f2e2665697340ac719e7ff1bf148dd014e55c1"
},
{
"url": "https://git.kernel.org/stable/c/c3d2799877906d0c8392d96e14216cd82b020330"
},
{
"url": "https://git.kernel.org/stable/c/e660a22402944f2615a16fde7129a3c497537329"
},
{
"url": "https://git.kernel.org/stable/c/381a0925c556a8d91a80a9b9e3e86651d60ffee3"
}
],
"title": "Bluetooth: hci_sock: Serialize dead-device detachment",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-99015",
"datePublished": "2026-10-23T12:20:41.608Z",
"dateReserved": "2026-09-25T10:25:14.385Z",
"dateUpdated": "2026-10-30T12:40:57.696Z",
"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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