---
id: CVE-2023-53648
title: 'ALSA: ac97: Fix possible NULL dereference in snd_ac97_mixer'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  ALSA: ac97: Fix possible NULL dereference in snd_ac97_mixer

  smatch error:
  sound/pci/ac97/ac97_codec.c:2354 snd_ac97_mixer() error:
  we previously assumed 'rac97' could …
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= da3cec35dd3c31d8706db4bf379372ce70d92118 <
    809af7bb4219bdeef0dbb8b2ed700d6516d13fe9
  - >-
    Linux >= da3cec35dd3c31d8706db4bf379372ce70d92118 <
    e4cccff1e7ab6ea30995b6fbbb007d02647e025c
  - >-
    Linux >= da3cec35dd3c31d8706db4bf379372ce70d92118 <
    5f13d67027fa782096e6aee0db5dce61c4aeb613
  - >-
    Linux >= da3cec35dd3c31d8706db4bf379372ce70d92118 <
    f923a582217b198b557756809ffe42ac0fad6adb
  - >-
    Linux >= da3cec35dd3c31d8706db4bf379372ce70d92118 <
    300e26e3e64880de5013eac8831cf44387ef752c
  - >-
    Linux >= da3cec35dd3c31d8706db4bf379372ce70d92118 <
    d28b83252e150155b8b8c65b612c555e93c8b45f
  - >-
    Linux >= da3cec35dd3c31d8706db4bf379372ce70d92118 <
    09baf460dfba79ee6a0c72e68ccdbbba84d894df
  - >-
    Linux >= da3cec35dd3c31d8706db4bf379372ce70d92118 <
    228da1fa124470606ac19783e551f9d51a1e01b0
  - >-
    Linux >= da3cec35dd3c31d8706db4bf379372ce70d92118 <
    79597c8bf64ca99eab385115743131d260339da5
  - Linux 2.6.28
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-05T20:26:24.421507Z'
published: '2025-10-07'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T20:31:19.302Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2023-53648'
references:
  - url: 'https://git.kernel.org/stable/c/809af7bb4219bdeef0dbb8b2ed700d6516d13fe9'
  - url: 'https://git.kernel.org/stable/c/e4cccff1e7ab6ea30995b6fbbb007d02647e025c'
  - url: 'https://git.kernel.org/stable/c/5f13d67027fa782096e6aee0db5dce61c4aeb613'
  - url: 'https://git.kernel.org/stable/c/f923a582217b198b557756809ffe42ac0fad6adb'
  - url: 'https://git.kernel.org/stable/c/300e26e3e64880de5013eac8831cf44387ef752c'
  - url: 'https://git.kernel.org/stable/c/d28b83252e150155b8b8c65b612c555e93c8b45f'
  - url: 'https://git.kernel.org/stable/c/09baf460dfba79ee6a0c72e68ccdbbba84d894df'
  - url: 'https://git.kernel.org/stable/c/228da1fa124470606ac19783e551f9d51a1e01b0'
  - url: 'https://git.kernel.org/stable/c/79597c8bf64ca99eab385115743131d260339da5'
tags:
  - cve.org
epss: 0.00213
epssPercentile: 0.11672
ingestedAt: '2026-11-05T22:38:31.822Z'
---

## Overview

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

ALSA: ac97: Fix possible NULL dereference in snd_ac97_mixer

smatch error:
sound/pci/ac97/ac97_codec.c:2354 snd_ac97_mixer() error:
we previously assumed 'rac97' could be null (see line 2072)

remove redundant assignment, return error if rac97 is NULL.

## Affected

- `Linux >= da3cec35dd3c31d8706db4bf379372ce70d92118 < 809af7bb4219bdeef0dbb8b2ed700d6516d13fe9`
- `Linux >= da3cec35dd3c31d8706db4bf379372ce70d92118 < e4cccff1e7ab6ea30995b6fbbb007d02647e025c`
- `Linux >= da3cec35dd3c31d8706db4bf379372ce70d92118 < 5f13d67027fa782096e6aee0db5dce61c4aeb613`
- `Linux >= da3cec35dd3c31d8706db4bf379372ce70d92118 < f923a582217b198b557756809ffe42ac0fad6adb`
- `Linux >= da3cec35dd3c31d8706db4bf379372ce70d92118 < 300e26e3e64880de5013eac8831cf44387ef752c`
- `Linux >= da3cec35dd3c31d8706db4bf379372ce70d92118 < d28b83252e150155b8b8c65b612c555e93c8b45f`
- `Linux >= da3cec35dd3c31d8706db4bf379372ce70d92118 < 09baf460dfba79ee6a0c72e68ccdbbba84d894df`
- `Linux >= da3cec35dd3c31d8706db4bf379372ce70d92118 < 228da1fa124470606ac19783e551f9d51a1e01b0`
- `Linux >= da3cec35dd3c31d8706db4bf379372ce70d92118 < 79597c8bf64ca99eab385115743131d260339da5`
- `Linux 2.6.28`

## Remediation

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