CVE-2026-90033

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.

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EPSS — Exploit Prediction

0.0020

Probability of exploitation

0.09%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

References

Other References

https://git.kernel.org/stable/c/1d4add2b832b56f81bb0eab065ec35c610343018 https://git.kernel.org/stable/c/2dae0e3a59e31f78222279d544b98e747cd1fbff https://git.kernel.org/stable/c/5538daf2a5cc80ac3f3e913c0db045d92d995d40 https://git.kernel.org/stable/c/9392a2c346762ffee8edd1ba8bac50d2e24a2ed7 https://git.kernel.org/stable/c/9d81885d97cba7796d1f8edc88f2499c8296f5b9 https://git.kernel.org/stable/c/a441a8e52148c91c2f2a91f42e3b9bc961a13a4b https://git.kernel.org/stable/c/de6d252f115be887a701c09a05cdb076f3a590c9 https://git.kernel.org/stable/c/e4637ce34607f1733a34a57294966d26b263e626

Frequently Asked Questions

What is CVE-2026-90033? +

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.

How do I check if I'm vulnerable to CVE-2026-90033? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.