---
id: CVE-2026-98006
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  ALSA: caiaq: Decoupling ep1_in_urb in caiaq dev

  The epq_in_urb object belonging to the caiaq device is coupled within
  the struct snd_usb_caiaqdev
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  ALSA: caiaq: Decoupling ep1_in_urb in caiaq dev

  The epq_in_urb object belonging to the caiaq device is coupled within
  the struct snd_usb_caiaqdev. After usb_submit_urb…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 523f1dce37434a9a6623bf46e7893e2b4b10ac3c <
    d6dd3c915b0d02457711d8fbaa60efc52144557f
  - >-
    Linux >= 523f1dce37434a9a6623bf46e7893e2b4b10ac3c <
    0c1b907d5db2f3508375776e5b78d69591aa5626
  - >-
    Linux >= 523f1dce37434a9a6623bf46e7893e2b4b10ac3c <
    d41e6c1533f09b27fc562260d41417490d2b6084
  - >-
    Linux >= 523f1dce37434a9a6623bf46e7893e2b4b10ac3c <
    402a9d6aab7ac787ab075adeb562c3db8b8f564b
  - Linux 2.6.22
published: '2026-09-25'
updated: '2026-09-25'
sourceUpdated: '2026-09-25T11:17:28.847'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-98006'
references:
  - url: 'https://git.kernel.org/stable/c/0c1b907d5db2f3508375776e5b78d69591aa5626'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/402a9d6aab7ac787ab075adeb562c3db8b8f564b'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/d41e6c1533f09b27fc562260d41417490d2b6084'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/d6dd3c915b0d02457711d8fbaa60efc52144557f'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-25T11:06:38.861Z'
---

## Overview

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

ALSA: caiaq: Decoupling ep1_in_urb in caiaq dev

The epq_in_urb object belonging to the caiaq device is coupled within
the struct snd_usb_caiaqdev. After usb_submit_urb(epq_in_urb, GFP_KERNEL)
executes successfully, epq_in_urb is successfully added to the urbp_list
queue of the dummy HCD driver (userspace specifies dummy_hcd as the HCD
layer driver for the caiaq USB device).

When init_card() calls snd_usb_caiaq_send_command() which subsequently
fails due to a timeout, and proceeds to call snd_card_free() to release
the card, the embedded ep1_in_urb object is also freed. When the dummy
HCD driver detects that the URB has been unlinked, it returns the URB
(by usb_hcd_giveback_urb()), which triggers [1].

Decouple the ep1_in_urb object from the struct snd_usb_caiaqdev and switch
to using a pointer instead. Separately allocate and manage the memory for
ep1_in_urb to prevent the release of the snd_card memory object from
interfering with it.

midi_out_urb has the same issue as ep1_in_urb and is handled in the same
way.

[1]
BUG: KASAN: slab-use-after-free in usb_free_urb+0x24/0x120 drivers/usb/core/urb.c:96
Write of size 4 at addr ffff88803cee1050 by task ktimers/1/29
Call Trace:
 usb_free_urb+0x24/0x120 drivers/usb/core/urb.c:96
 dummy_timer+0xaac/0x4d50 drivers/usb/gadget/udc/dummy_hcd.c:2019
 __run_hrtimer kernel/time/hrtimer.c:2067 [inline]
 __hrtimer_run_queues+0x3eb/0xaf0 kernel/time/hrtimer.c:2124
 hrtimer_run_softirq+0x1e1/0x2e0 kernel/time/hrtimer.c:2141

Allocated by task 36:
 snd_card_new+0x7b/0x110 sound/core/init.c:184
 create_card sound/usb/caiaq/device.c:429 [inline]
 snd_probe+0x236/0x1af0 sound/usb/caiaq/device.c:544

Freed by task 36:
 snd_card_free_when_closed sound/core/init.c:630 [inline]
 snd_card_free+0x138/0x1d0 sound/core/init.c:662
 snd_probe+0x162b/0x1af0 sound/usb/caiaq/device.c:553

## Remediation

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