---
id: CVE-2026-23208
title: 'ALSA: usb-audio: Prevent excessive number of frames'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  ALSA: usb-audio: Prevent excessive number of frames

  In this case, the user constructed the parameters with maxpacksize 40
  for rate 22050 / pps 1000, and packsize[0] 22…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 02c56650f3c118d3752122996d96173d26bb13aa <
    480a1490c595a242f27493a4544b3efb21b29f6a
  - >-
    Linux >= 5ef30e443e6d3654cccecec99cf481a69a0a6d3b <
    ab0b5e92fc36ee82c1bd01fe896d0f775ed5de41
  - >-
    Linux >= 99703c921864a318e3e8aae74fde071b1ff35bea <
    282aba56713bbc58155716b55ca7222b2d9cf3c8
  - >-
    Linux >= 2d50acd7dbd0682a56968ad9551341d7fc5b6eaf <
    c4dc012b027c9eb101583011089dea14d744e314
  - >-
    Linux >= aba41867dd66939d336fdf604e4d73b805d8039f <
    e0ed5a36fb3ab9e7b9ee45cd17f09f6d5f594360
  - >-
    Linux >= d288dc74f8cf95cb7ae0aaf245b7128627a49bf3 <
    d67dde02049e632ba58d3c44a164a74b6a737154
  - >-
    Linux >= f0bd62b64016508938df9babe47f65c2c727d25c <
    152fc4f7b4a8af1c0418d2722f3b2729799cc837
  - >-
    Linux >= f0bd62b64016508938df9babe47f65c2c727d25c <
    81e4b0009f2acc841d77a24fd796528b0bf62c4e
  - >-
    Linux >= f0bd62b64016508938df9babe47f65c2c727d25c <
    62932d9ed639a9fa71b4ac1a56766a4b43abb7e4
  - >-
    Linux >= f0bd62b64016508938df9babe47f65c2c727d25c <
    ef5749ef8b307bf8717945701b1b79d036af0a15
  - Linux >= 4.4.229 < 4.4.230
  - Linux >= 4.9.229 < 4.9.230
  - Linux >= 4.14.186 < 4.14.188
  - Linux >= 4.19.130 < 4.19.132
  - Linux >= 5.4.49 < 5.4.51
  - Linux >= 5.7.6 < 5.7.8
  - Linux 5.8
published: '2026-02-14'
updated: '2026-10-21'
sourceUpdated: '2026-10-21T12:38:57.202Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-23208'
references:
  - url: 'https://git.kernel.org/stable/c/480a1490c595a242f27493a4544b3efb21b29f6a'
  - url: 'https://git.kernel.org/stable/c/ab0b5e92fc36ee82c1bd01fe896d0f775ed5de41'
  - url: 'https://git.kernel.org/stable/c/282aba56713bbc58155716b55ca7222b2d9cf3c8'
  - url: 'https://git.kernel.org/stable/c/c4dc012b027c9eb101583011089dea14d744e314'
  - url: 'https://git.kernel.org/stable/c/e0ed5a36fb3ab9e7b9ee45cd17f09f6d5f594360'
  - url: 'https://git.kernel.org/stable/c/d67dde02049e632ba58d3c44a164a74b6a737154'
  - url: 'https://git.kernel.org/stable/c/152fc4f7b4a8af1c0418d2722f3b2729799cc837'
  - url: 'https://git.kernel.org/stable/c/81e4b0009f2acc841d77a24fd796528b0bf62c4e'
  - url: 'https://git.kernel.org/stable/c/62932d9ed639a9fa71b4ac1a56766a4b43abb7e4'
  - url: 'https://git.kernel.org/stable/c/ef5749ef8b307bf8717945701b1b79d036af0a15'
tags:
  - cve.org
epss: 0.00186
epssPercentile: 0.0811
ingestedAt: '2026-10-21T12:48:53.670Z'
---

## Overview

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

ALSA: usb-audio: Prevent excessive number of frames

In this case, the user constructed the parameters with maxpacksize 40
for rate 22050 / pps 1000, and packsize[0] 22 packsize[1] 23. The buffer
size for each data URB is maxpacksize * packets, which in this example
is 40 * 6 = 240; When the user performs a write operation to send audio
data into the ALSA PCM playback stream, the calculated number of frames
is packsize[0] * packets = 264, which exceeds the allocated URB buffer
size, triggering the out-of-bounds (OOB) issue reported by syzbot [1].

Added a check for the number of single data URB frames when calculating
the number of frames to prevent [1].

[1]
BUG: KASAN: slab-out-of-bounds in copy_to_urb+0x261/0x460 sound/usb/pcm.c:1487
Write of size 264 at addr ffff88804337e800 by task syz.0.17/5506
Call Trace:
 copy_to_urb+0x261/0x460 sound/usb/pcm.c:1487
 prepare_playback_urb+0x953/0x13d0 sound/usb/pcm.c:1611
 prepare_outbound_urb+0x377/0xc50 sound/usb/endpoint.c:333

## Affected

- `Linux >= 02c56650f3c118d3752122996d96173d26bb13aa < 480a1490c595a242f27493a4544b3efb21b29f6a`
- `Linux >= 5ef30e443e6d3654cccecec99cf481a69a0a6d3b < ab0b5e92fc36ee82c1bd01fe896d0f775ed5de41`
- `Linux >= 99703c921864a318e3e8aae74fde071b1ff35bea < 282aba56713bbc58155716b55ca7222b2d9cf3c8`
- `Linux >= 2d50acd7dbd0682a56968ad9551341d7fc5b6eaf < c4dc012b027c9eb101583011089dea14d744e314`
- `Linux >= aba41867dd66939d336fdf604e4d73b805d8039f < e0ed5a36fb3ab9e7b9ee45cd17f09f6d5f594360`
- `Linux >= d288dc74f8cf95cb7ae0aaf245b7128627a49bf3 < d67dde02049e632ba58d3c44a164a74b6a737154`
- `Linux >= f0bd62b64016508938df9babe47f65c2c727d25c < 152fc4f7b4a8af1c0418d2722f3b2729799cc837`
- `Linux >= f0bd62b64016508938df9babe47f65c2c727d25c < 81e4b0009f2acc841d77a24fd796528b0bf62c4e`
- `Linux >= f0bd62b64016508938df9babe47f65c2c727d25c < 62932d9ed639a9fa71b4ac1a56766a4b43abb7e4`
- `Linux >= f0bd62b64016508938df9babe47f65c2c727d25c < ef5749ef8b307bf8717945701b1b79d036af0a15`
- `Linux >= 4.4.229 < 4.4.230`
- `Linux >= 4.9.229 < 4.9.230`
- `Linux >= 4.14.186 < 4.14.188`
- `Linux >= 4.19.130 < 4.19.132`
- `Linux >= 5.4.49 < 5.4.51`
- `Linux >= 5.7.6 < 5.7.8`
- `Linux 5.8`

## Remediation

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