CVE-2026-80829Hinoki check available

Kernel memory corruption via undersized USB endpoint

Published Sep 4, 2026 · Updated Sep 4, 2026

Out-of-bounds write in Linux kernel ALSA USB audio code allows physically proximate attackers to corrupt memory via a malicious MIDI device. snd_usbmidi_novation_output passes max_transfer minus two as a signed count; a one-byte endpoint makes it negative, and memcpy converts it to a size_t length that overruns the allocated transfer buffer. Exploitation requires attaching a device that advertises a one-byte bulk OUT endpoint; no higher-level consequence is documented.

CVSS severityUnavailable
Unscored
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Out-of-bounds write in Linux kernel ALSA USB audio code allows physically proximate attackers to corrupt memory via a malicious MIDI device. snd_usbmidi_novation_output passes max_transfer minus two as a signed count; a one-byte endpoint makes it negative, and memcpy converts it to a size_t length that overruns the allocated transfer buffer. Exploitation requires attaching a device that advertises a one-byte bulk OUT endpoint; no higher-level consequence is documented.

The record

CVE
CVE-2026-80829
Published
Sep 4, 2026
Updated
Sep 4, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1200
Attack vector
physical
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 4, 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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1035a8f63bae28e498b0e7b5ac91d749844a7158
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1074c2306901b44ebcb83855583c6776e1e392ea
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <558fc4485ecc704edfe7876d6cebae4738ff7ef8
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7639ec9755d3ec0ec8cd7c0fdd2c3d3997434870
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7f00dbddb51f4f74325cdc7c3f6b19fb3392481a
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <91919b3b99ab7ce3d7dbb39fcf7c6c742a663c0c
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <94e4562fcc81badd1d467ddfb88c27e4fae974c2
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <9c8212436631b0063cb021e9f58df438e3db84d0
  9. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e9c00d7533f99aa9833c4b598f47e3b3202fdb9a
  10. Affected versionversion=2.6.12

What conditions does exploitation require?

Attack vectorphysical
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1035a8f63bae28e498b0e7b5ac91d749844a7158; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1074c2306901b44ebcb83855583c6776e1e392ea; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <558fc4485ecc704edfe7876d6cebae4738ff7ef8; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7639ec9755d3ec0ec8cd7c0fdd2c3d3997434870; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7f00dbddb51f4f74325cdc7c3f6b19fb3392481a; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <91919b3b99ab7ce3d7dbb39fcf7c6c742a663c0c; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <94e4562fcc81badd1d467ddfb88c27e4fae974c2; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <9c8212436631b0063cb021e9f58df438e3db84d0; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e9c00d7533f99aa9833c4b598f47e3b3202fdb9a; version=2.6.12

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.

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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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