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CVE-2026-99015

Linux: Bluetooth: hci_sock: Serialize dead-device detachment

Linux LinuxOperating systems
Open in ThreatlineRecord JSON
CVSS
NoneNot scored
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)No scoreNo FIRST EPSS score in this snapshot yet
Fixed in37cef0c8fb537f40600910d2c2e5f2d5509305f3Also 76f2e2665697340ac719e7ff1bf148dd014e55c1, 381a0925c556a8d91a80a9b9e3e86651d60ffee3 and 7 moreCVE List
Published23 Oct 2026Updated 23 Oct 2026CVE List

What fixes it

Show all 10 fixed versions

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

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.

Text from CVE List

Affected versions 26

  • Linuxaffected: e04480920d1eec9c061841399aa6f35b6f987d8b before 37cef0c8fb537f40600910d2c2e5f2d5509305f3CVE List
  • Linuxaffected: e04480920d1eec9c061841399aa6f35b6f987d8b before 76f2e2665697340ac719e7ff1bf148dd014e55c1CVE List
  • Linuxaffected: e04480920d1eec9c061841399aa6f35b6f987d8b before c3d2799877906d0c8392d96e14216cd82b020330CVE List
  • Linuxaffected: e04480920d1eec9c061841399aa6f35b6f987d8b before e660a22402944f2615a16fde7129a3c497537329CVE List
  • Linuxaffected: e04480920d1eec9c061841399aa6f35b6f987d8b before 381a0925c556a8d91a80a9b9e3e86651d60ffee3CVE List
  • Linuxaffected: d6ef8bb00aa65eceb413fc165a55086459863e38CVE List
  • Linuxaffected: 0e77f979a97d3d517fad0b51249ba6fb8ae2d365CVE List
  • Linuxaffected: 0782c8c7f80c9dd457acdfe16fd0f339f0e73093CVE List
  • Linuxaffected: 3719acc161d5c1ce09912cc1c9eddc2c5faa3c66CVE List
  • Linuxaffected: ff29fe26ab8679bc13a3f0bf5b2911535a1cfc35CVE List
  • Linuxaffected: f2f856b65ac4b77049c76c0e89ecd3a177e9fcd1CVE List
  • Linuxaffected: 75dd00b755ebfa9b24eaedc9f42e9adfc00ae00cCVE List
  • Linuxaffected: 4.4.281 before 4.5CVE List
  • Linuxaffected: 4.9.280 before 4.10CVE List
  • Linuxaffected: 4.14.244 before 4.15CVE List
  • Linuxaffected: 4.19.203 before 4.20CVE List
  • Linuxaffected: 5.4.140 before 5.5CVE List
  • Linuxaffected: 5.10.58 before 5.11CVE List
  • Linuxaffected: 5.13.10 before 5.14CVE List
  • Linuxaffected: 5.14CVE List
  • Linuxunaffected: all versions before 5.14CVE List
  • Linuxunaffected: 6.6.160 through 6.6.*CVE List
  • Linuxunaffected: 6.12.113 through 6.12.*CVE List
  • Linuxunaffected: 6.18.57 through 6.18.*CVE List
  • Linuxunaffected: 7.2.11 through 7.2.*CVE List
  • Linuxunaffected: 7.3CVE List

References 5