---
id: CVE-2026-43459
title: 'ASoC: soc-core: flush delayed work before removing DAIs and widgets'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  ASoC: soc-core: flush delayed work before removing DAIs and widgets

  When a sound card is unbound while a PCM stream is open, a
  use-after-free can occur in snd_soc_dapm…
severity: high
cvss: 7.3
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H'
cvssSource: cna
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= e894efef9ac7c10b7727798dcc711cccf07569f9 <
    bf80a89da97285d9b877e0c6995e870d46b8025c
  - >-
    Linux >= e894efef9ac7c10b7727798dcc711cccf07569f9 <
    3887e514978d28216246360b46a9cb534969eb5a
  - >-
    Linux >= e894efef9ac7c10b7727798dcc711cccf07569f9 <
    231568afbc0cd25b8fb2a94ebf9738eabe1cf007
  - >-
    Linux >= e894efef9ac7c10b7727798dcc711cccf07569f9 <
    317a9298c54bb00319da73e5a7179f00e67fcbdf
  - >-
    Linux >= e894efef9ac7c10b7727798dcc711cccf07569f9 <
    eab71e11ce2447c1e01809cbc11eab4234cf8dc8
  - >-
    Linux >= e894efef9ac7c10b7727798dcc711cccf07569f9 <
    7d33e6140945482a07f8089ee86e13e02553ffdb
  - >-
    Linux >= e894efef9ac7c10b7727798dcc711cccf07569f9 <
    c054f0607c8bb1b1aa529bc109e4149298a1cccd
  - >-
    Linux >= e894efef9ac7c10b7727798dcc711cccf07569f9 <
    95bc5c225513fc3c4ce169563fb5e3929fbb938b
  - Linux 4.20
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-16T15:17:35.638816Z'
published: '2026-05-08'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T15:20:42.281Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-43459'
references:
  - url: 'https://git.kernel.org/stable/c/bf80a89da97285d9b877e0c6995e870d46b8025c'
  - url: 'https://git.kernel.org/stable/c/3887e514978d28216246360b46a9cb534969eb5a'
  - url: 'https://git.kernel.org/stable/c/231568afbc0cd25b8fb2a94ebf9738eabe1cf007'
  - url: 'https://git.kernel.org/stable/c/317a9298c54bb00319da73e5a7179f00e67fcbdf'
  - url: 'https://git.kernel.org/stable/c/eab71e11ce2447c1e01809cbc11eab4234cf8dc8'
  - url: 'https://git.kernel.org/stable/c/7d33e6140945482a07f8089ee86e13e02553ffdb'
  - url: 'https://git.kernel.org/stable/c/c054f0607c8bb1b1aa529bc109e4149298a1cccd'
  - url: 'https://git.kernel.org/stable/c/95bc5c225513fc3c4ce169563fb5e3929fbb938b'
tags:
  - cve.org
epss: 0.00165
epssPercentile: 0.05373
ingestedAt: '2026-10-16T17:24:46.697Z'
---

## Overview

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

ASoC: soc-core: flush delayed work before removing DAIs and widgets

When a sound card is unbound while a PCM stream is open, a
use-after-free can occur in snd_soc_dapm_stream_event(), called from
the close_delayed_work workqueue handler.

During unbind, snd_soc_unbind_card() flushes delayed work and then
calls soc_cleanup_card_resources(). Inside cleanup,
snd_card_disconnect_sync() releases all PCM file descriptors, and
the resulting PCM close path can call snd_soc_dapm_stream_stop()
which schedules new delayed work with a pmdown_time timer delay.
Since this happens after the flush in snd_soc_unbind_card(), the
new work is not caught. soc_remove_link_components() then frees
DAPM widgets before this work fires, leading to the use-after-free.

The existing flush in soc_free_pcm_runtime() also cannot help as it
runs after soc_remove_link_components() has already freed the widgets.

Add a flush in soc_cleanup_card_resources() after
snd_card_disconnect_sync() (after which no new PCM closes can
schedule further delayed work) and before soc_remove_link_dais()
and soc_remove_link_components() (which tear down the structures the
delayed work accesses).

## Affected

- `Linux >= e894efef9ac7c10b7727798dcc711cccf07569f9 < bf80a89da97285d9b877e0c6995e870d46b8025c`
- `Linux >= e894efef9ac7c10b7727798dcc711cccf07569f9 < 3887e514978d28216246360b46a9cb534969eb5a`
- `Linux >= e894efef9ac7c10b7727798dcc711cccf07569f9 < 231568afbc0cd25b8fb2a94ebf9738eabe1cf007`
- `Linux >= e894efef9ac7c10b7727798dcc711cccf07569f9 < 317a9298c54bb00319da73e5a7179f00e67fcbdf`
- `Linux >= e894efef9ac7c10b7727798dcc711cccf07569f9 < eab71e11ce2447c1e01809cbc11eab4234cf8dc8`
- `Linux >= e894efef9ac7c10b7727798dcc711cccf07569f9 < 7d33e6140945482a07f8089ee86e13e02553ffdb`
- `Linux >= e894efef9ac7c10b7727798dcc711cccf07569f9 < c054f0607c8bb1b1aa529bc109e4149298a1cccd`
- `Linux >= e894efef9ac7c10b7727798dcc711cccf07569f9 < 95bc5c225513fc3c4ce169563fb5e3929fbb938b`
- `Linux 4.20`

## Remediation

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