CVE-2026-90034Hinoki check available

Kernel memory disclosure via short USB messages

Published Sep 16, 2026 · Updated Sep 16, 2026

Kernel memory disclosure in affected Linux releases allows physically proximate attackers to read stale data through a crafted USB device. The mdc800 driver allocates its IRQ and download URB buffers without initialization, so short replies leave old kernel bytes in the unread buffer tail. Exploitation requires a crafted MDC800-compatible USB device and local access to data returned through the driver's userspace interface.

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

What happened

Kernel memory disclosure in affected Linux releases allows physically proximate attackers to read stale data through a crafted USB device. The mdc800 driver allocates its IRQ and download URB buffers without initialization, so short replies leave old kernel bytes in the unread buffer tail. Exploitation requires a crafted MDC800-compatible USB device and local access to data returned through the driver's userspace interface.

The record

CVE
CVE-2026-90034
Published
Sep 16, 2026
Updated
Sep 16, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
physical
Privileges
Unavailable

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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=0 <5.10.270
  2. Affected versionversion=0 <5.15.221
  3. Affected versionversion=0 <6.1.188
  4. Affected versionversion=0 <6.12.110
  5. Affected versionversion=0 <6.18.51
  6. Affected versionversion=0 <6.6.157
  7. Affected versionversion=0 <7.2.5
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2430eb81e44111b30eeb5273bbcf8b24ca517ef9
  9. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2df8f7720ed91f1aad4f128553b6e90c7c5fac1e
  10. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <553c375e86a49882e95840565512e17bff31cc3a
  11. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <67c6726dd6048a2781aa43a2bf9fcf1e16ee3a7d
  12. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6c601410d1a9ae645f604fe2f61b9f4942c77dfb
  13. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <838455cc8bfe1278150d1d776529edea6cd4c1dd
  14. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8c38049879f2108f57c98f03cc7f3db51a12bdab
  15. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e22428f0c038c23109c0383a235aa607b0cd4c95

What conditions does exploitation require?

Attack vectorphysical
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=0 <5.10.270; version=0 <5.15.221; version=0 <6.1.188; version=0 <6.12.110; version=0 <6.18.51; version=0 <6.6.157; version=0 <7.2.5; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2430eb81e44111b30eeb5273bbcf8b24ca517ef9; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2df8f7720ed91f1aad4f128553b6e90c7c5fac1e; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <553c375e86a49882e95840565512e17bff31cc3a; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <67c6726dd6048a2781aa43a2bf9fcf1e16ee3a7d; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6c601410d1a9ae645f604fe2f61b9f4942c77dfb; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <838455cc8bfe1278150d1d776529edea6cd4c1dd; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8c38049879f2108f57c98f03cc7f3db51a12bdab; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e22428f0c038c23109c0383a235aa607b0cd4c95

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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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