CVE-2025-21835: usb: gadget: f_midi: fix MIDI Streaming descriptor lengths
In the Linux kernel, the following vulnerability has been resolved:
usb: gadget: fmidi: fix MIDI Streaming descriptor lengths
While the MIDI jacks are configured correctly, and the MIDIStreaming endpoint descriptors are filled with the correct information, bNumEmbMIDIJack and bLength are set incorrectly in these descriptors.
This does not matter when the numbers of in and out ports are equal, but when they differ the host will receive broken descriptors with uninitialized stack memory leaking into the descriptor for whichever value is smaller.
The precise meaning of "in" and "out" in the port counts is not clearly defined and can be confusing. But elsewhere the driver consistently uses this to match the USB meaning of IN and OUT viewed from the host, so that "in" ports send data to the host and "out" ports receive data from it.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2025-21835?
CVE-2025-21835 is classified as a moderate severity vulnerability in the Linux kernel.
How do I fix CVE-2025-21835?
To fix CVE-2025-21835, update your Linux kernel to the latest version where the vulnerability has been resolved.
What components are affected by CVE-2025-21835?
CVE-2025-21835 specifically affects the usb gadget driver related to MIDI streaming in the Linux kernel.
Is CVE-2025-21835 actively being exploited?
As of now, there are no known active exploitations of CVE-2025-21835 reported.
What impacts does CVE-2025-21835 have on systems?
CVE-2025-21835 can lead to potential stability issues in systems using MIDI gadgets, affecting audio performance.