---
id: CVE-2026-98741
title: 'ALSA: ua101: reject mismatched capture/playback packet sizes'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  ALSA: ua101: reject mismatched capture/playback packet sizes

  detect_usb_format() cross-checks bSubframeSize, bBitResolution and
  tSamFreq between the capture and playba…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 63978ab3e3e963db28093b53bb4598f2702e1ad7 <
    fd3a7bf0d988b0878a1957df150edb35f81db87e
  - >-
    Linux >= 63978ab3e3e963db28093b53bb4598f2702e1ad7 <
    eb0c7fda59cf650076f8ed5b949a6c8441aa3606
  - >-
    Linux >= 63978ab3e3e963db28093b53bb4598f2702e1ad7 <
    4294fe57048594a9e158b61c967bb7f943cda477
  - >-
    Linux >= 63978ab3e3e963db28093b53bb4598f2702e1ad7 <
    86f86e6fdedc33c5b8d38b9208b350f8accf57ee
  - Linux 2.6.34
published: '2026-10-18'
updated: '2026-10-18'
sourceUpdated: '2026-10-18T15:47:26.283Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-98741'
references:
  - url: 'https://git.kernel.org/stable/c/fd3a7bf0d988b0878a1957df150edb35f81db87e'
  - url: 'https://git.kernel.org/stable/c/eb0c7fda59cf650076f8ed5b949a6c8441aa3606'
  - url: 'https://git.kernel.org/stable/c/4294fe57048594a9e158b61c967bb7f943cda477'
  - url: 'https://git.kernel.org/stable/c/86f86e6fdedc33c5b8d38b9208b350f8accf57ee'
tags:
  - cve.org
ingestedAt: '2026-10-18T16:47:32.502Z'
---

## Overview

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

ALSA: ua101: reject mismatched capture/playback packet sizes

detect_usb_format() cross-checks bSubframeSize, bBitResolution and
tSamFreq between the capture and playback interfaces, but never relates
the two endpoints' wMaxPacketSize and bNrChannels.  Each playback URB
gets a buffer of ua->playback.max_packet_bytes, while the number of
bytes written into it is derived from the capture stream:
capture_urb_complete() computes frames from the received capture packet
and capture.frame_bytes, and start_usb_playback() and playback_work()
multiply that by playback.frame_bytes.

A device declaring a large capture wMaxPacketSize with few capture
channels and a small playback wMaxPacketSize with many playback channels
therefore memset()s and memcpy()s past the end of the playback buffer,
in open() of the PCM node the driver registers during probe.
usb_submit_urb() rejects the over-long iso_frame_desc[0].length with
-EMSGSIZE, but only after the write.

Reject such descriptors at probe time.  Genuine UA-101/UA-1000 hardware
declares proportional packet sizes and is unaffected.

  BUG: KASAN: slab-out-of-bounds in start_usb_playback (sound/usb/misc/ua101.c:586)
  Write of size 2048 at addr ffff8881098f3c00 by task exploit/5021
  Call Trace:
   __asan_memset (mm/kasan/shadow.c:84)
   start_usb_playback (sound/usb/misc/ua101.c:586)
   playback_pcm_open (sound/usb/misc/ua101.c:679)
   snd_pcm_open_substream (sound/core/pcm_native.c:2829)
   snd_pcm_open (sound/core/pcm_native.c:2865 sound/core/pcm_native.c:2932)
   snd_pcm_playback_open (sound/core/pcm_native.c:2891)
   snd_open (sound/core/sound.c:166)
   chrdev_open (fs/char_dev.c:411)
   do_dentry_open (fs/open.c:996)
   vfs_open (fs/open.c:1101)
   path_openat (fs/namei.c:4837 fs/namei.c:5000)
   do_file_open (fs/namei.c:5029)
   do_sys_openat2 (fs/open.c:1417)
   __x64_sys_openat (fs/open.c:1423 fs/open.c:1439 fs/open.c:1434)
   do_syscall_64 (arch/x86/entry/syscall_64.c:61 arch/x86/entry/syscall_64.c:84)
   entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)

  The buggy address belongs to the object at ffff8881098f3c00
   which belongs to the cache kmalloc-192 of size 192
  The buggy address is located 0 bytes inside of
   allocated 168-byte region [ffff8881098f3c00, ffff8881098f3ca8)

## Affected

- `Linux >= 63978ab3e3e963db28093b53bb4598f2702e1ad7 < fd3a7bf0d988b0878a1957df150edb35f81db87e`
- `Linux >= 63978ab3e3e963db28093b53bb4598f2702e1ad7 < eb0c7fda59cf650076f8ed5b949a6c8441aa3606`
- `Linux >= 63978ab3e3e963db28093b53bb4598f2702e1ad7 < 4294fe57048594a9e158b61c967bb7f943cda477`
- `Linux >= 63978ab3e3e963db28093b53bb4598f2702e1ad7 < 86f86e6fdedc33c5b8d38b9208b350f8accf57ee`
- `Linux 2.6.34`

## Remediation

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