Linux Kernel up to 7.3-rc1 ALSA usb-audio snd_usbmidi_us122l_output max_transfer out-of-bounds write

CVSS Meta Temp Score
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CTI Interest Score
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9.5$5k-$25k0.00

Summaryinfo

A vulnerability was found in Linux Kernel up to 7.3-rc1. It has been classified as very critical. Affected by this issue is the function snd_usbmidi_us122l_output of the component ALSA usb-audio. Performing a manipulation of the argument max_transfer results in out-of-bounds write. This vulnerability is cataloged as CVE-2026-90033. It is possible to initiate the attack remotely. There is no exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Linux Kernel up to 7.3-rc1. It has been classified as very critical. This affects the function snd_usbmidi_us122l_output of the component ALSA usb-audio. The manipulation of the argument max_transfer with an unknown input leads to a out-of-bounds write vulnerability. CWE is classifying the issue as CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at git.kernel.org. This vulnerability is uniquely identified as CVE-2026-90033 since 09/11/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 09/16/2026).

Upgrading to version 5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.110, 6.18.51, 7.2.5 or 7.3-rc2 eliminates this vulnerability. Applying the patch 5538daf2a5cc80ac3f3e913c0db045d92d995d40/a441a8e52148c91c2f2a91f42e3b9bc961a13a4b/2dae0e3a59e31f78222279d544b98e747cd1fbff/1d4add2b832b56f81bb0eab065ec35c610343018/de6d252f115be887a701c09a05cdb076f3a590c9/9392a2c346762ffee8edd1ba8bac50d2e24a2ed7/9d81885d97cba7796d1f8edc88f2499c8296f5b9/e4637ce34607f1733a34a57294966d26b263e626 is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version.

Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 10.0
VulDB Meta Temp Score: 9.5

VulDB Base Score: 10.0
VulDB Temp Score: 9.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Out-of-bounds write
CWE: CWE-787 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 5.10.270/5.15.221/6.1.188/6.6.157/6.12.110/6.18.51/7.2.5/7.3-rc2
Patch: 5538daf2a5cc80ac3f3e913c0db045d92d995d40/a441a8e52148c91c2f2a91f42e3b9bc961a13a4b/2dae0e3a59e31f78222279d544b98e747cd1fbff/1d4add2b832b56f81bb0eab065ec35c610343018/de6d252f115be887a701c09a05cdb076f3a590c9/9392a2c346762ffee8edd1ba8bac50d2e24a2ed7/9d81885d97cba7796d1f8edc88f2499c8296f5b9/e4637ce34607f1733a34a57294966d26b263e626

Timelineinfo

09/11/2026 CVE reserved
09/16/2026 +5 days Advisory disclosed
09/16/2026 +0 days VulDB entry created
09/16/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-90033 (🔒)
GCVE (CVE): GCVE-0-2026-90033
GCVE (VulDB): GCVE-100-405879

Entryinfo

Created: 09/16/2026 15:32
Changes: 09/16/2026 15:32 (60)
Complete: 🔍
Cache ID: 216::103

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