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

Severity: unknown
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-14 · updated 2026-10-26

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.

Affected products

Linux kernel: before 6.1.189; before 6.6.158; before 6.12.112; before 6.18.54; before 7.2.8 — fixed in 6.1.189, 6.12.112, 6.18.54, 6.6.158, 7.2.8, 7.3

How to fix

Upgrade to a fixed version: Linux kernel 6.1.189, 6.12.112, 6.18.54, 6.6.158. Check the vendor advisory for mitigations.

References

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