---
id: CVE-2026-74497
title: 'ALSA: usb-audio: Clamp frame size in implicit-feedback mode'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  ALSA: usb-audio: Clamp frame size in implicit-feedback mode

  snd_usb_handle_sync_urb() scales received sync packet sizes by the sender's
  stride and stores the result di…
severity: high
cvss: 8.4
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 28acb12014fb0c3e1edfdab1b1e3e266cf651550 <
    2d39fea6d3c19a2f5811d123114d92e3d0115fd1
  - >-
    Linux >= 28acb12014fb0c3e1edfdab1b1e3e266cf651550 <
    09cf3dbbb4256a43feb91d2f51f274510a9ada47
  - >-
    Linux >= 28acb12014fb0c3e1edfdab1b1e3e266cf651550 <
    cfa8d3e0e8b812c4db4d5241f62b6bdbab2bd7be
  - >-
    Linux >= 28acb12014fb0c3e1edfdab1b1e3e266cf651550 <
    56ac3e7c90f6b45969c3fd07a98fad760ffd6901
  - >-
    Linux >= 28acb12014fb0c3e1edfdab1b1e3e266cf651550 <
    be97fea7451d758881b95af78e900dd0d58a382a
  - >-
    Linux >= 28acb12014fb0c3e1edfdab1b1e3e266cf651550 <
    2db4535d6af79276a64449201c5be5feffb31c64
  - >-
    Linux >= 28acb12014fb0c3e1edfdab1b1e3e266cf651550 <
    53f0aa37eb945f3c983f61d12fc35eb33debb8a9
  - >-
    Linux >= 28acb12014fb0c3e1edfdab1b1e3e266cf651550 <
    8d7a30c50c2e58a6839634ed0acde14466d1dc61
  - Linux 3.8
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-16T18:58:20.810517Z'
published: '2026-08-15'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T19:05:50.570Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-74497'
references:
  - url: 'https://git.kernel.org/stable/c/2d39fea6d3c19a2f5811d123114d92e3d0115fd1'
  - url: 'https://git.kernel.org/stable/c/09cf3dbbb4256a43feb91d2f51f274510a9ada47'
  - url: 'https://git.kernel.org/stable/c/cfa8d3e0e8b812c4db4d5241f62b6bdbab2bd7be'
  - url: 'https://git.kernel.org/stable/c/56ac3e7c90f6b45969c3fd07a98fad760ffd6901'
  - url: 'https://git.kernel.org/stable/c/be97fea7451d758881b95af78e900dd0d58a382a'
  - url: 'https://git.kernel.org/stable/c/2db4535d6af79276a64449201c5be5feffb31c64'
  - url: 'https://git.kernel.org/stable/c/53f0aa37eb945f3c983f61d12fc35eb33debb8a9'
  - url: 'https://git.kernel.org/stable/c/8d7a30c50c2e58a6839634ed0acde14466d1dc61'
tags:
  - cve.org
epss: 0.00142
epssPercentile: 0.03116
ingestedAt: '2026-10-16T19:46:24.353Z'
---

## Overview

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

ALSA: usb-audio: Clamp frame size in implicit-feedback mode

snd_usb_handle_sync_urb() scales received sync packet sizes by the sender's
stride and stores the result directly in out_packet->packet_size[i]. If a
connected USB device sends an oversized sync packet, this frame count can
exceed ep->maxframesize.

The un-clamped frame count then propagates to the playback endpoint queue,
potentially driving packet transfers beyond the endpoint's hardware frame
limits.

Cap the calculated frame count against ep->maxframesize in
snd_usb_handle_sync_urb() to prevent oversized packets from entering the
playback queue.

## Affected

- `Linux >= 28acb12014fb0c3e1edfdab1b1e3e266cf651550 < 2d39fea6d3c19a2f5811d123114d92e3d0115fd1`
- `Linux >= 28acb12014fb0c3e1edfdab1b1e3e266cf651550 < 09cf3dbbb4256a43feb91d2f51f274510a9ada47`
- `Linux >= 28acb12014fb0c3e1edfdab1b1e3e266cf651550 < cfa8d3e0e8b812c4db4d5241f62b6bdbab2bd7be`
- `Linux >= 28acb12014fb0c3e1edfdab1b1e3e266cf651550 < 56ac3e7c90f6b45969c3fd07a98fad760ffd6901`
- `Linux >= 28acb12014fb0c3e1edfdab1b1e3e266cf651550 < be97fea7451d758881b95af78e900dd0d58a382a`
- `Linux >= 28acb12014fb0c3e1edfdab1b1e3e266cf651550 < 2db4535d6af79276a64449201c5be5feffb31c64`
- `Linux >= 28acb12014fb0c3e1edfdab1b1e3e266cf651550 < 53f0aa37eb945f3c983f61d12fc35eb33debb8a9`
- `Linux >= 28acb12014fb0c3e1edfdab1b1e3e266cf651550 < 8d7a30c50c2e58a6839634ed0acde14466d1dc61`
- `Linux 3.8`

## Remediation

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