---
id: CVE-2026-98246
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  Bluetooth: hci_sync: Serialize local codec list cleanup

  hci_dev_close_sync() clears hdev->local_codecs after releasing hdev->lock.
  Codec list additions and both traver…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  Bluetooth: hci_sync: Serialize local codec list cleanup

  hci_dev_close_sync() clears hdev->local_codecs after releasing hdev->lock.
  Codec list additions and both traver…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 626535077ba9dc110787540d1fe24881094c15a1 <
    9f407d52c0d881430d689836d3e7d32aa36f98b5
  - >-
    Linux >= b938790e70540bf4f2e653dcd74b232494d06c8f <
    560ed4373c06a58123ecdf9ad5ecaddc87a73382
  - >-
    Linux >= b938790e70540bf4f2e653dcd74b232494d06c8f <
    1ee0c5429dc4a92879bda2554b1bfd4abc6c587c
  - >-
    Linux >= b938790e70540bf4f2e653dcd74b232494d06c8f <
    4dc1ae5ff75b17e17ec4b74b11cc4b0099e71e00
  - >-
    Linux >= b938790e70540bf4f2e653dcd74b232494d06c8f <
    1276c2fafd18499769a28f96f45c5a76d6fc990e
  - >-
    Linux >= b938790e70540bf4f2e653dcd74b232494d06c8f <
    9a10987a2f160a44a638c9a35994ca6e3089696e
  - Linux eea5a8f0c3b7c884d2351e75fbdd0a3d7def5ae1
  - Linux >= 6.1.57 < 6.1.189
  - Linux >= 6.5.7 < 6.6
  - Linux 6.6
published: '2026-10-06'
updated: '2026-10-06'
sourceUpdated: '2026-10-06T09:18:12.783'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-98246'
references:
  - url: 'https://git.kernel.org/stable/c/1276c2fafd18499769a28f96f45c5a76d6fc990e'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/1ee0c5429dc4a92879bda2554b1bfd4abc6c587c'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/4dc1ae5ff75b17e17ec4b74b11cc4b0099e71e00'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/560ed4373c06a58123ecdf9ad5ecaddc87a73382'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/9a10987a2f160a44a638c9a35994ca6e3089696e'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/9f407d52c0d881430d689836d3e7d32aa36f98b5'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-10-06T08:50:17.431Z'
---

## Overview

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

Bluetooth: hci_sync: Serialize local codec list cleanup

hci_dev_close_sync() clears hdev->local_codecs after releasing hdev->lock.
Codec list additions and both traversals in sco_sock_getsockopt() use that
lock, but the close path does not. A close and BT_CODEC query can therefore
interleave as follows:

  hci_dev_close_sync()          sco_sock_getsockopt()
                                hci_dev_lock()
                                fetch codec entry
  hci_codec_list_clear()
    kfree(entry)
                                read entry->id

The reader then accesses an entry which the close path has freed. KASAN

  BUG: KASAN: slab-use-after-free in sco_sock_getsockopt+0xfa0/0xfe0
  Read of size 1 at addr ffff8881001c3450
  Call Trace:
   sco_sock_getsockopt+0xfa0/0xfe0
   do_sock_getsockopt+0x537/0x7b0
   __sys_getsockopt+0xf2/0x170
  Allocated by task 92:
   hci_codec_list_add.isra.0+0x2c/0x440
   hci_read_codec_capabilities+0x224/0x590
   hci_read_supported_codecs+0x2c2/0x640
  Freed by task 92:
   kfree+0x131/0x3c0
   hci_codec_list_clear+0xd8/0x160
   hci_dev_close_sync+0x92a/0xfa0

Take hdev->lock around the clear operation at its existing point in the
close path. This makes the clear wait for active readers and prevents a new
traversal until the list is empty without changing teardown ordering.

## Remediation

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