---
id: CVE-2026-23462
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  Bluetooth: HIDP: Fix possible UAF

  This fixes the following trace caused by not dropping l2cap_conn
  reference when user->remove callback is called:

  [   97.809249] l2ca…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  Bluetooth: HIDP: Fix possible UAF

  This fixes the following trace caused by not dropping l2cap_conn
  reference when user->remove callback is called:

  [   97.809249] l2ca…
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'
cwe:
  - CWE-416
vendor: linux
product: linux_kernel
affected:
  - 'linux_kernel >= 3.10, < 5.10.253'
  - 'linux_kernel >= 5.11, < 5.15.203'
  - 'linux_kernel >= 5.16, < 6.1.167'
  - 'linux_kernel >= 6.2, < 6.6.130'
  - 'linux_kernel >= 6.7, < 6.12.78'
  - 'linux_kernel >= 6.13, < 6.18.20'
  - 'linux_kernel >= 6.19, < 6.19.10'
  - linux_kernel = 7.0
patched:
  - linux_kernel 6.19.10
published: '2026-04-03'
updated: '2026-07-24'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-23462'
references:
  - url: 'https://git.kernel.org/stable/c/18b1263ece6431bd78fa6b61faaef5281203741c'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/21a47a119f33df9bb157326846390d7e8e1b45ba'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/45ebe5b900200ac3e01f3470506a44a447825721'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/4d37fa7582aa960ba23e10a7a2596a29f37ad281'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/7c805b7d1e580eececcc92470292e3dbc42bc3f5'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/d955ccbf91ab74d76fe9e4eab2846a7d8a173075'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/dbf666e4fc9bdd975a61bf682b3f75cb0145eedd'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/f8b6ed2f06d3baa44f347a0fa2af52433f386463'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
epss: 0.00262
epssPercentile: 0.16026
ingestedAt: '2026-07-25T22:05:03.574Z'
---

## Overview

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

Bluetooth: HIDP: Fix possible UAF

This fixes the following trace caused by not dropping l2cap_conn
reference when user->remove callback is called:

[   97.809249] l2cap_conn_free: freeing conn ffff88810a171c00
[   97.809907] CPU: 1 UID: 0 PID: 1419 Comm: repro_standalon Not tainted 7.0.0-rc1-dirty #14 PREEMPT(lazy)
[   97.809935] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.17.0-debian-1.17.0-1 04/01/2014
[   97.809947] Call Trace:
[   97.809954]  <TASK>
[   97.809961]  dump_stack_lvl (lib/dump_stack.c:122)
[   97.809990]  l2cap_conn_free (net/bluetooth/l2cap_core.c:1808)
[   97.810017]  l2cap_conn_del (./include/linux/kref.h:66 net/bluetooth/l2cap_core.c:1821 net/bluetooth/l2cap_core.c:1798)
[   97.810055]  l2cap_disconn_cfm (net/bluetooth/l2cap_core.c:7347 (discriminator 1) net/bluetooth/l2cap_core.c:7340 (discriminator 1))
[   97.810086]  ? __pfx_l2cap_disconn_cfm (net/bluetooth/l2cap_core.c:7341)
[   97.810117]  hci_conn_hash_flush (./include/net/bluetooth/hci_core.h:2152 (discriminator 2) net/bluetooth/hci_conn.c:2644 (discriminator 2))
[   97.810148]  hci_dev_close_sync (net/bluetooth/hci_sync.c:5360)
[   97.810180]  ? __pfx_hci_dev_close_sync (net/bluetooth/hci_sync.c:5285)
[   97.810212]  ? srso_alias_return_thunk (arch/x86/lib/retpoline.S:221)
[   97.810242]  ? up_write (./arch/x86/include/asm/atomic64_64.h:87 (discriminator 5) ./include/linux/atomic/atomic-arch-fallback.h:2852 (discriminator 5) ./include/linux/atomic/atomic-long.h:268 (discriminator 5) ./include/linux/atomic/atomic-instrumented.h:3391 (discriminator 5) kernel/locking/rwsem.c:1385 (discriminator 5) kernel/locking/rwsem.c:1643 (discriminator 5))
[   97.810267]  ? srso_alias_return_thunk (arch/x86/lib/retpoline.S:221)
[   97.810290]  ? rcu_is_watching (./arch/x86/include/asm/atomic.h:23 ./include/linux/atomic/atomic-arch-fallback.h:457 ./include/linux/context_tracking.h:128 kernel/rcu/tree.c:752)
[   97.810320]  hci_unregister_dev (net/bluetooth/hci_core.c:504 net/bluetooth/hci_core.c:2716)
[   97.810346]  vhci_release (drivers/bluetooth/hci_vhci.c:691)
[   97.810375]  ? __pfx_vhci_release (drivers/bluetooth/hci_vhci.c:678)
[   97.810404]  __fput (fs/file_table.c:470)
[   97.810430]  task_work_run (kernel/task_work.c:235)
[   97.810451]  ? __pfx_task_work_run (kernel/task_work.c:201)
[   97.810472]  ? srso_alias_return_thunk (arch/x86/lib/retpoline.S:221)
[   97.810495]  ? do_raw_spin_unlock (./include/asm-generic/qspinlock.h:128 (discriminator 5) kernel/locking/spinlock_debug.c:142 (discriminator 5))
[   97.810527]  do_exit (kernel/exit.c:972)
[   97.810547]  ? srso_alias_return_thunk (arch/x86/lib/retpoline.S:221)
[   97.810574]  ? __pfx_do_exit (kernel/exit.c:897)
[   97.810594]  ? lock_acquire (kernel/locking/lockdep.c:470 (discriminator 6) kernel/locking/lockdep.c:5870 (discriminator 6) kernel/locking/lockdep.c:5825 (discriminator 6))
[   97.810616]  ? srso_alias_return_thunk (arch/x86/lib/retpoline.S:221)
[   97.810639]  ? do_raw_spin_lock (kernel/locking/spinlock_debug.c:95 (discriminator 4) kernel/locking/spinlock_debug.c:118 (discriminator 4))
[   97.810664]  ? srso_alias_return_thunk (arch/x86/lib/retpoline.S:221)
[   97.810688]  ? find_held_lock (kernel/locking/lockdep.c:5350 (discriminator 1))
[   97.810721]  do_group_exit (kernel/exit.c:1093)
[   97.810745]  get_signal (kernel/signal.c:3007 (discriminator 1))
[   97.810772]  ? security_file_permission (./arch/x86/include/asm/jump_label.h:37 security/security.c:2366)
[   97.810803]  ? srso_alias_return_thunk (arch/x86/lib/retpoline.S:221)
[   97.810826]  ? vfs_read (fs/read_write.c:555)
[   97.810854]  ? __pfx_get_signal (kernel/signal.c:2800)
[   97.810880]  ? srso_alias_return_thunk (arch/x86/lib/retpoline.S:221)
[   97.810905]  ? __pfx_vfs_read (fs/read_write.c:555)
[   97.810932]  ? srso_alias_return_thunk (arch/x86/lib/retpoline.S:221)
[   97.810960]  arch_do_signal_or_restart (arch/
---truncated---

## Affected

- `linux_kernel >= 3.10, < 5.10.253`
- `linux_kernel >= 5.11, < 5.15.203`
- `linux_kernel >= 5.16, < 6.1.167`
- `linux_kernel >= 6.2, < 6.6.130`
- `linux_kernel >= 6.7, < 6.12.78`
- `linux_kernel >= 6.13, < 6.18.20`
- `linux_kernel >= 6.19, < 6.19.10`
- `linux_kernel = 7.0`

## Remediation

Upgrade past the affected range:

- `linux_kernel 6.19.10`