---
id: CVE-2026-74302
title: 'Bluetooth: hci_core: Fix UAF in hci_unregister_dev()'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  Bluetooth: hci_core: Fix UAF in hci_unregister_dev()

  hci_unregister_dev() does not disable cmd_timer and ncmd_timer
  before the hci_dev structure is freed. If a timeout…
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 0d151a103775dd9645c78c97f77d6e2a5298d913 <
    48c7ad6afcc58c2cda11fed39791708103b6a644
  - >-
    Linux >= 0d151a103775dd9645c78c97f77d6e2a5298d913 <
    a0fd1086a57b982f8c24ae4ab165c2af39fe1735
  - >-
    Linux >= 0d151a103775dd9645c78c97f77d6e2a5298d913 <
    672d52d9412252e61b8de8d773ccdf5a277cf540
  - >-
    Linux >= 0d151a103775dd9645c78c97f77d6e2a5298d913 <
    5edcc018fa6e80b2c478454a4a8229c23d67c181
  - Linux 48542881997e17b49dc16b93fe910e0cfcf7a9f9
  - Linux 9cfc84b1d464cc024286f42a090718f9067b80ed
  - Linux ddeda6ca5f218b668b560d90fc31ae469adbfd92
  - Linux d2ce562a5aff1dcd0c50d9808ea825ef90da909f
  - Linux 96600c2e5ee8213dbab5df1617293d8e847bb4fa
  - Linux d6cbce18370641a21dd889e8613d8153df15eb39
  - Linux 3f939bd73fed12dddc2a32a76116c19ca47c7678
  - Linux >= 4.19.319 < 4.20
  - Linux >= 5.4.281 < 5.5
  - Linux >= 5.10.223 < 5.11
  - Linux >= 5.15.164 < 5.16
  - Linux >= 6.1.101 < 6.2
  - Linux >= 6.6.42 < 6.7
  - Linux >= 6.9.11 < 6.10
  - Linux 6.10
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-16T18:52:48.387407Z'
published: '2026-08-15'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T18:55:31.734Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-74302'
references:
  - url: 'https://git.kernel.org/stable/c/48c7ad6afcc58c2cda11fed39791708103b6a644'
  - url: 'https://git.kernel.org/stable/c/a0fd1086a57b982f8c24ae4ab165c2af39fe1735'
  - url: 'https://git.kernel.org/stable/c/672d52d9412252e61b8de8d773ccdf5a277cf540'
  - url: 'https://git.kernel.org/stable/c/5edcc018fa6e80b2c478454a4a8229c23d67c181'
tags:
  - cve.org
epss: 0.0017
epssPercentile: 0.05949
ingestedAt: '2026-10-16T19:46:24.382Z'
---

## Overview

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

Bluetooth: hci_core: Fix UAF in hci_unregister_dev()

hci_unregister_dev() does not disable cmd_timer and ncmd_timer
before the hci_dev structure is freed. If a timeout fires
during device teardown, the callback dereferences freed memory
(including the hdev->reset function pointer), leading to a
use-after-free.

Add disable_delayed_work_sync() calls alongside the existing
disable_work_sync() calls to ensure both timers are fully
quiesced before teardown proceeds.

## Affected

- `Linux >= 0d151a103775dd9645c78c97f77d6e2a5298d913 < 48c7ad6afcc58c2cda11fed39791708103b6a644`
- `Linux >= 0d151a103775dd9645c78c97f77d6e2a5298d913 < a0fd1086a57b982f8c24ae4ab165c2af39fe1735`
- `Linux >= 0d151a103775dd9645c78c97f77d6e2a5298d913 < 672d52d9412252e61b8de8d773ccdf5a277cf540`
- `Linux >= 0d151a103775dd9645c78c97f77d6e2a5298d913 < 5edcc018fa6e80b2c478454a4a8229c23d67c181`
- `Linux 48542881997e17b49dc16b93fe910e0cfcf7a9f9`
- `Linux 9cfc84b1d464cc024286f42a090718f9067b80ed`
- `Linux ddeda6ca5f218b668b560d90fc31ae469adbfd92`
- `Linux d2ce562a5aff1dcd0c50d9808ea825ef90da909f`
- `Linux 96600c2e5ee8213dbab5df1617293d8e847bb4fa`
- `Linux d6cbce18370641a21dd889e8613d8153df15eb39`
- `Linux 3f939bd73fed12dddc2a32a76116c19ca47c7678`
- `Linux >= 4.19.319 < 4.20`
- `Linux >= 5.4.281 < 5.5`
- `Linux >= 5.10.223 < 5.11`
- `Linux >= 5.15.164 < 5.16`
- `Linux >= 6.1.101 < 6.2`
- `Linux >= 6.6.42 < 6.7`
- `Linux >= 6.9.11 < 6.10`
- `Linux 6.10`

## Remediation

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