---
id: CVE-2024-50029
title: 'Bluetooth: hci_conn: Fix UAF in hci_enhanced_setup_sync'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  Bluetooth: hci_conn: Fix UAF in hci_enhanced_setup_sync

  This checks if the ACL connection remains valid as it could be destroyed
  while hci_enhanced_setup_sync is pendi…
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= e07a06b4eb417f5271d33ce2240e93c62d98b7b4 <
    9b666a0490379c860eab380dec19a864c0bc256b
  - >-
    Linux >= e07a06b4eb417f5271d33ce2240e93c62d98b7b4 <
    867639300759e3e1c5b1e1a5ff89231f263a32a7
  - >-
    Linux >= e07a06b4eb417f5271d33ce2240e93c62d98b7b4 <
    98ccd44002d88cbf4edfc4480df532a3da5a013e
  - >-
    Linux >= e07a06b4eb417f5271d33ce2240e93c62d98b7b4 <
    18fd04ad856df07733f5bb07e7f7168e7443d393
  - Linux 6.1
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2024-10-22T13:26:20.682749Z'
published: '2024-10-21'
updated: '2026-09-14'
sourceUpdated: '2026-09-14T11:57:46.149Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2024-50029'
references:
  - url: 'https://git.kernel.org/stable/c/9b666a0490379c860eab380dec19a864c0bc256b'
  - url: 'https://git.kernel.org/stable/c/867639300759e3e1c5b1e1a5ff89231f263a32a7'
  - url: 'https://git.kernel.org/stable/c/98ccd44002d88cbf4edfc4480df532a3da5a013e'
  - url: 'https://git.kernel.org/stable/c/18fd04ad856df07733f5bb07e7f7168e7443d393'
tags:
  - cve.org
epss: 0.00369
epssPercentile: 0.27975
ingestedAt: '2026-09-14T15:23:07.460Z'
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: hci_conn: Fix UAF in hci_enhanced_setup_sync

This checks if the ACL connection remains valid as it could be destroyed
while hci_enhanced_setup_sync is pending on cmd_sync leading to the
following trace:

BUG: KASAN: slab-use-after-free in hci_enhanced_setup_sync+0x91b/0xa60
Read of size 1 at addr ffff888002328ffd by task kworker/u5:2/37

CPU: 0 UID: 0 PID: 37 Comm: kworker/u5:2 Not tainted 6.11.0-rc6-01300-g810be445d8d6 #7099
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-2.fc40 04/01/2014
Workqueue: hci0 hci_cmd_sync_work
Call Trace:
 <TASK>
 dump_stack_lvl+0x5d/0x80
 ? hci_enhanced_setup_sync+0x91b/0xa60
 print_report+0x152/0x4c0
 ? hci_enhanced_setup_sync+0x91b/0xa60
 ? __virt_addr_valid+0x1fa/0x420
 ? hci_enhanced_setup_sync+0x91b/0xa60
 kasan_report+0xda/0x1b0
 ? hci_enhanced_setup_sync+0x91b/0xa60
 hci_enhanced_setup_sync+0x91b/0xa60
 ? __pfx_hci_enhanced_setup_sync+0x10/0x10
 ? __pfx___mutex_lock+0x10/0x10
 hci_cmd_sync_work+0x1c2/0x330
 process_one_work+0x7d9/0x1360
 ? __pfx_lock_acquire+0x10/0x10
 ? __pfx_process_one_work+0x10/0x10
 ? assign_work+0x167/0x240
 worker_thread+0x5b7/0xf60
 ? __kthread_parkme+0xac/0x1c0
 ? __pfx_worker_thread+0x10/0x10
 ? __pfx_worker_thread+0x10/0x10
 kthread+0x293/0x360
 ? __pfx_kthread+0x10/0x10
 ret_from_fork+0x2f/0x70
 ? __pfx_kthread+0x10/0x10
 ret_from_fork_asm+0x1a/0x30
 </TASK>

Allocated by task 34:
 kasan_save_stack+0x30/0x50
 kasan_save_track+0x14/0x30
 __kasan_kmalloc+0x8f/0xa0
 __hci_conn_add+0x187/0x17d0
 hci_connect_sco+0x2e1/0xb90
 sco_sock_connect+0x2a2/0xb80
 __sys_connect+0x227/0x2a0
 __x64_sys_connect+0x6d/0xb0
 do_syscall_64+0x71/0x140
 entry_SYSCALL_64_after_hwframe+0x76/0x7e

Freed by task 37:
 kasan_save_stack+0x30/0x50
 kasan_save_track+0x14/0x30
 kasan_save_free_info+0x3b/0x60
 __kasan_slab_free+0x101/0x160
 kfree+0xd0/0x250
 device_release+0x9a/0x210
 kobject_put+0x151/0x280
 hci_conn_del+0x448/0xbf0
 hci_abort_conn_sync+0x46f/0x980
 hci_cmd_sync_work+0x1c2/0x330
 process_one_work+0x7d9/0x1360
 worker_thread+0x5b7/0xf60
 kthread+0x293/0x360
 ret_from_fork+0x2f/0x70
 ret_from_fork_asm+0x1a/0x30

## Affected

- `Linux >= e07a06b4eb417f5271d33ce2240e93c62d98b7b4 < 9b666a0490379c860eab380dec19a864c0bc256b`
- `Linux >= e07a06b4eb417f5271d33ce2240e93c62d98b7b4 < 867639300759e3e1c5b1e1a5ff89231f263a32a7`
- `Linux >= e07a06b4eb417f5271d33ce2240e93c62d98b7b4 < 98ccd44002d88cbf4edfc4480df532a3da5a013e`
- `Linux >= e07a06b4eb417f5271d33ce2240e93c62d98b7b4 < 18fd04ad856df07733f5bb07e7f7168e7443d393`
- `Linux 6.1`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.