Linux kernel ALSA: OOB write in snd_usbmidi_us122l_output
CVE-2026-90033 Published on September 16, 2026
ALSA: usb-audio: fix OOB write in snd_usbmidi_us122l_output()
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.
Products Associated with CVE-2026-90033
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Affected Versions
Linux:- Version 030a07e441296c372f946cd4065b5d831d8dc40c and below 5538daf2a5cc80ac3f3e913c0db045d92d995d40 is affected.
- Version 030a07e441296c372f946cd4065b5d831d8dc40c and below a441a8e52148c91c2f2a91f42e3b9bc961a13a4b is affected.
- Version 030a07e441296c372f946cd4065b5d831d8dc40c and below 2dae0e3a59e31f78222279d544b98e747cd1fbff is affected.
- Version 030a07e441296c372f946cd4065b5d831d8dc40c and below 1d4add2b832b56f81bb0eab065ec35c610343018 is affected.
- Version 030a07e441296c372f946cd4065b5d831d8dc40c and below de6d252f115be887a701c09a05cdb076f3a590c9 is affected.
- Version 030a07e441296c372f946cd4065b5d831d8dc40c and below 9392a2c346762ffee8edd1ba8bac50d2e24a2ed7 is affected.
- Version 030a07e441296c372f946cd4065b5d831d8dc40c and below 9d81885d97cba7796d1f8edc88f2499c8296f5b9 is affected.
- Version 030a07e441296c372f946cd4065b5d831d8dc40c and below e4637ce34607f1733a34a57294966d26b263e626 is affected.
- Version 2.6.28 is affected.
- Before 2.6.28 is unaffected.
- Version 5.10.270, <= 5.10.* is unaffected.
- Version 5.15.221, <= 5.15.* is unaffected.
- Version 6.1.188, <= 6.1.* is unaffected.
- Version 6.6.157, <= 6.6.* is unaffected.
- Version 6.12.110, <= 6.12.* is unaffected.
- Version 6.18.51, <= 6.18.* is unaffected.
- Version 7.2.5, <= 7.2.* is unaffected.
- Version 7.3-rc2, <= * is unaffected.