CVE-2026-90033

ALSA: usb-audio: fix OOB write in snd_usbmidi_us122l_output()

State: Published
Severity: Not scored
Published: Sep 16, 2026
Updated: Oct 19, 2026
Reserved: Sep 11, 2026

Description

In the Linux kernel, the following vulnerability has been resolved:

ALSA: usb-audio: fix OOB write in snd_usbmidi_us122l_output()

The snd_usbmidi_us122l_output() picks a count of 2 on anything slower than high speed and never relates it to ep->max_transfer. The URB buffer holds exactly max_transfer bytes, so a device declaring a one byte bulk endpoint takes two bytes from snd_rawmidi_transmit(), and the memset that pads the rest computes 1 - 2 in int and wraps to SIZE_MAX.

Only 0x800e and 0x800f are pinned to nine bytes. The US-122MKII at 0x0644:0x8021 falls to the default and takes usb_maxpacket(), which the USB core only clamps downward.

The akai and novation output ops in this file were given the same guard recently. Do the same here.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	030a07e441296c372f946cd4065b5d831d8dc40c to before 5538daf2a5cc80ac3f3e913c0db045d92d995d40Affected 030a07e441296c372f946cd4065b5d831d8dc40c to before a441a8e52148c91c2f2a91f42e3b9bc961a13a4bAffected 030a07e441296c372f946cd4065b5d831d8dc40c to before 2dae0e3a59e31f78222279d544b98e747cd1fbffAffected 030a07e441296c372f946cd4065b5d831d8dc40c to before 1d4add2b832b56f81bb0eab065ec35c610343018Affected 030a07e441296c372f946cd4065b5d831d8dc40c to before de6d252f115be887a701c09a05cdb076f3a590c9Affected 030a07e441296c372f946cd4065b5d831d8dc40c to before 9392a2c346762ffee8edd1ba8bac50d2e24a2ed7Affected 030a07e441296c372f946cd4065b5d831d8dc40c to before 9d81885d97cba7796d1f8edc88f2499c8296f5b9Affected 030a07e441296c372f946cd4065b5d831d8dc40c to before e4637ce34607f1733a34a57294966d26b263e626Affected
LinuxLinux	2.6.28Affected before 2.6.28Not affected 5.10.270 through 5.10.Not affected 5.15.221 through 5.15.Not affected 6.1.188 through 6.1.Not affected 6.6.157 through 6.6.Not affected 6.12.110 through 6.12.Not affected 6.18.51 through 6.18.Not affected 7.2.5 through 7.2.*Not affected 7.3 and laterNot affected

Product

Versions

LinuxLinux

030a07e441296c372f946cd4065b5d831d8dc40c to before 5538daf2a5cc80ac3f3e913c0db045d92d995d40Affected
030a07e441296c372f946cd4065b5d831d8dc40c to before a441a8e52148c91c2f2a91f42e3b9bc961a13a4bAffected
030a07e441296c372f946cd4065b5d831d8dc40c to before 2dae0e3a59e31f78222279d544b98e747cd1fbffAffected
030a07e441296c372f946cd4065b5d831d8dc40c to before 1d4add2b832b56f81bb0eab065ec35c610343018Affected
030a07e441296c372f946cd4065b5d831d8dc40c to before de6d252f115be887a701c09a05cdb076f3a590c9Affected
030a07e441296c372f946cd4065b5d831d8dc40c to before 9392a2c346762ffee8edd1ba8bac50d2e24a2ed7Affected
030a07e441296c372f946cd4065b5d831d8dc40c to before 9d81885d97cba7796d1f8edc88f2499c8296f5b9Affected
030a07e441296c372f946cd4065b5d831d8dc40c to before e4637ce34607f1733a34a57294966d26b263e626Affected

LinuxLinux

2.6.28Affected
before 2.6.28Not affected
5.10.270 through 5.10.*Not affected
5.15.221 through 5.15.*Not affected
6.1.188 through 6.1.*Not affected
6.6.157 through 6.6.*Not affected
6.12.110 through 6.12.*Not affected
6.18.51 through 6.18.*Not affected
7.2.5 through 7.2.*Not affected
7.3 and laterNot affected

References

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