---
id: CVE-2026-90198
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  ALSA: core: Fix use-after-free in snd_card_do_free()

  A use-after-free was detected in snd_card_do_free() when a sound card
  managed by devres is unbound while a user-sp…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  ALSA: core: Fix use-after-free in snd_card_do_free()

  A use-after-free was detected in snd_card_do_free() when a sound card
  managed by devres is unbound while a user-sp…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= e8ad415b7a55cb9a9fbfc04696518d5ea0b609b3 <
    d3d67f680dbc23a5e5e3d3ecfdbf700465809877
  - >-
    Linux >= e8ad415b7a55cb9a9fbfc04696518d5ea0b609b3 <
    09b27dd01b98480334c10bf6fb8d41d5fb063a4b
  - >-
    Linux >= e8ad415b7a55cb9a9fbfc04696518d5ea0b609b3 <
    03c5dabc8f16bc212a5b26d2425c03a55e55a86d
  - >-
    Linux >= e8ad415b7a55cb9a9fbfc04696518d5ea0b609b3 <
    6da22efb5cf490b06ffbca32b10fc8af7654fee0
  - >-
    Linux >= e8ad415b7a55cb9a9fbfc04696518d5ea0b609b3 <
    a561012868ae37c28f61fdf658bf6f251bc0e8e8
  - >-
    Linux >= e8ad415b7a55cb9a9fbfc04696518d5ea0b609b3 <
    7d9b5e86775fa97a487da08b9aa76e1674bf8868
  - >-
    Linux >= e8ad415b7a55cb9a9fbfc04696518d5ea0b609b3 <
    5ae1a690c522fea2900ff56c8c2ace7b059f5e04
  - Linux 5.15
published: '2026-09-17'
updated: '2026-09-17'
sourceUpdated: '2026-09-17T17:17:14.633'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-90198'
references:
  - url: 'https://git.kernel.org/stable/c/03c5dabc8f16bc212a5b26d2425c03a55e55a86d'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/09b27dd01b98480334c10bf6fb8d41d5fb063a4b'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/5ae1a690c522fea2900ff56c8c2ace7b059f5e04'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/6da22efb5cf490b06ffbca32b10fc8af7654fee0'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/7d9b5e86775fa97a487da08b9aa76e1674bf8868'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/a561012868ae37c28f61fdf658bf6f251bc0e8e8'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/d3d67f680dbc23a5e5e3d3ecfdbf700465809877'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-17T16:21:47.861Z'
epss: 0.00221
epssPercentile: 0.12933
---

## Overview

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

ALSA: core: Fix use-after-free in snd_card_do_free()

A use-after-free was detected in snd_card_do_free() when a sound card
managed by devres is unbound while a user-space application still holds an
open file descriptor.

For managed cards, the memory is allocated using devres_alloc(), and its
release function is set to __snd_card_release(), which calls
snd_card_free(). When the device is unbound, the unbind thread calls
snd_card_free(), which drops a reference to the card's device. If the user
thread still has an open file descriptor, the reference count does not
reach zero, and the unbind thread blocks on wait_for_completion(&released).

When the user thread closes the file descriptor, it drops the final
reference, invoking the device release callback release_card_device(),
which calls snd_card_do_free(). snd_card_do_free() performs cleanup and
calls complete(card->release_completion). This wakes up the unbind thread,
which returns from snd_card_free() and __snd_card_release(). The devres
core then immediately frees the memory block containing the snd_card
structure.

Meanwhile, the user thread continues execution in snd_card_do_free() and
evaluates `if (!card->managed)`. It reads the `managed` boolean from the
snd_card structure that was just freed by the unbind thread, triggering a
KASAN use-after-free.

Fix this by caching the value of card->managed in a local variable before
calling complete(). This ensures that the card pointer is not dereferenced
after the unbind thread has been woken up and potentially freed the card.

BUG: KASAN: use-after-free in snd_card_do_free sound/core/init.c:604
[inline]
BUG: KASAN: use-after-free in release_card_device+0x1ab/0x1b0
sound/core/init.c:153
Read of size 1 at addr ffff8881912ec909 by task syz-executor130/5857

Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_address_description+0x55/0x1e0 mm/kasan/report.c:378
 print_report+0x58/0x70 mm/kasan/report.c:482
 kasan_report+0x117/0x150 mm/kasan/report.c:595
 snd_card_do_free sound/core/init.c:604 [inline]
 release_card_device+0x1ab/0x1b0 sound/core/init.c:153
 device_release+0xc4/0x1f0 drivers/base/core.c:-1
 kobject_cleanup lib/kobject.c:689 [inline]
 kobject_release lib/kobject.c:720 [inline]
 kref_put include/linux/kref.h:65 [inline]
 kobject_put+0x222/0x550 lib/kobject.c:737
 snd_card_file_remove+0x331/0x390 sound/core/init.c:1125
 snd_pcm_release+0x12c/0x160 sound/core/pcm_native.c:2986
 __fput+0x418/0xa50 fs/file_table.c:512
 fput_close_sync+0x11f/0x240 fs/file_table.c:617
 __do_sys_close fs/open.c:1511 [inline]
 __se_sys_close fs/open.c:1496 [inline]
 __x64_sys_close+0x7e/0x110 fs/open.c:1496
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
 </TASK>

## Remediation

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