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CVE PROGRAM SOURCE RECORDUnscored

CVE-2026-99015

Bluetooth: hci_sock: Serialize dead-device detachment

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Status
Published
Published
Updated
Assigning organization
Linux

Description

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • e04480920d1eec9c061841399aa6f35b6f987d8b to < 37cef0c8fb537f40600910d2c2e5f2d5509305f3affected
  • e04480920d1eec9c061841399aa6f35b6f987d8b to < 76f2e2665697340ac719e7ff1bf148dd014e55c1affected
  • e04480920d1eec9c061841399aa6f35b6f987d8b to < c3d2799877906d0c8392d96e14216cd82b020330affected
  • e04480920d1eec9c061841399aa6f35b6f987d8b to < e660a22402944f2615a16fde7129a3c497537329affected
  • e04480920d1eec9c061841399aa6f35b6f987d8b to < 381a0925c556a8d91a80a9b9e3e86651d60ffee3affected
  • d6ef8bb00aa65eceb413fc165a55086459863e38affected
  • 0e77f979a97d3d517fad0b51249ba6fb8ae2d365affected
  • 0782c8c7f80c9dd457acdfe16fd0f339f0e73093affected
  • 3719acc161d5c1ce09912cc1c9eddc2c5faa3c66affected
  • ff29fe26ab8679bc13a3f0bf5b2911535a1cfc35affected
  • f2f856b65ac4b77049c76c0e89ecd3a177e9fcd1affected
  • 75dd00b755ebfa9b24eaedc9f42e9adfc00ae00caffected
  • 4.4.281 to < 4.5affected
  • 4.9.280 to < 4.10affected
  • 4.14.244 to < 4.15affected
  • 4.19.203 to < 4.20affected
  • 5.4.140 to < 5.5affected
  • 5.10.58 to < 5.11affected
  • 5.13.10 to < 5.14affected

Linux Linux

Default version status: affected

  • 5.14affected
  • 0 to < 5.14unaffected
  • 6.6.160 to ≤ 6.6.*unaffected
  • 6.12.113 to ≤ 6.12.*unaffected
  • 6.18.57 to ≤ 6.18.*unaffected
  • 7.2.11 to ≤ 7.2.*unaffected
  • 7.3 to ≤ *unaffected

References