CVE-2026-90033

Kernel memory corruption via undersized USB endpoint

Published Sep 16, 2026 · Updated Sep 16, 2026

Out-of-bounds write in affected Linux kernels allows physically proximate attackers to corrupt kernel memory via a crafted USB MIDI endpoint. snd_usbmidi_us122l_output() requests two MIDI bytes when ep->max_transfer and its URB buffer are one byte, then passes the wrapped result of 1 - 2 to memset() as a size. Exploitation requires a physically connected USB MIDI device that advertises a one-byte bulk endpoint and reaches the US-122L output path; published evidence does not establish code execution.

CVSS severityUnavailable
Unscored
EPSS probabilityUnavailable
No score available in this record
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in affected Linux kernels allows physically proximate attackers to corrupt kernel memory via a crafted USB MIDI endpoint. snd_usbmidi_us122l_output() requests two MIDI bytes when ep->max_transfer and its URB buffer are one byte, then passes the wrapped result of 1 - 2 to memset() as a size. Exploitation requires a physically connected USB MIDI device that advertises a one-byte bulk endpoint and reaches the US-122L output path; published evidence does not establish code execution.

The record

CVE
CVE-2026-90033
Published
Sep 16, 2026
Updated
Sep 16, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1200
Attack vector
physical
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=030a07e441296c372f946cd4065b5d831d8dc40c <1d4add2b832b56f81bb0eab065ec35c610343018
  2. Affected versionversion=030a07e441296c372f946cd4065b5d831d8dc40c <2dae0e3a59e31f78222279d544b98e747cd1fbff
  3. Affected versionversion=030a07e441296c372f946cd4065b5d831d8dc40c <5538daf2a5cc80ac3f3e913c0db045d92d995d40
  4. Affected versionversion=030a07e441296c372f946cd4065b5d831d8dc40c <9392a2c346762ffee8edd1ba8bac50d2e24a2ed7
  5. Affected versionversion=030a07e441296c372f946cd4065b5d831d8dc40c <9d81885d97cba7796d1f8edc88f2499c8296f5b9
  6. Affected versionversion=030a07e441296c372f946cd4065b5d831d8dc40c <a441a8e52148c91c2f2a91f42e3b9bc961a13a4b
  7. Affected versionversion=030a07e441296c372f946cd4065b5d831d8dc40c <de6d252f115be887a701c09a05cdb076f3a590c9
  8. Affected versionversion=030a07e441296c372f946cd4065b5d831d8dc40c <e4637ce34607f1733a34a57294966d26b263e626
  9. Affected versionversion=2.6.28

What conditions does exploitation require?

Attack vectorphysical
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=030a07e441296c372f946cd4065b5d831d8dc40c <1d4add2b832b56f81bb0eab065ec35c610343018; version=030a07e441296c372f946cd4065b5d831d8dc40c <2dae0e3a59e31f78222279d544b98e747cd1fbff; version=030a07e441296c372f946cd4065b5d831d8dc40c <5538daf2a5cc80ac3f3e913c0db045d92d995d40; version=030a07e441296c372f946cd4065b5d831d8dc40c <9392a2c346762ffee8edd1ba8bac50d2e24a2ed7; version=030a07e441296c372f946cd4065b5d831d8dc40c <9d81885d97cba7796d1f8edc88f2499c8296f5b9; version=030a07e441296c372f946cd4065b5d831d8dc40c <a441a8e52148c91c2f2a91f42e3b9bc961a13a4b; version=030a07e441296c372f946cd4065b5d831d8dc40c <de6d252f115be887a701c09a05cdb076f3a590c9; version=030a07e441296c372f946cd4065b5d831d8dc40c <e4637ce34607f1733a34a57294966d26b263e626; version=2.6.28

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorphysical
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1200Hardware Additions

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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