CVE-2026-43425

Local denial of service via active URB resubmission

Published May 8, 2026 · Updated May 8, 2026

A USB driver flaw in Linux Kernel allows local users to interrupt system availability through repeated reads after an MDC800 device timeout. In mdc800_device_read(), a timeout returns without canceling download_urb, and the next read resubmits the still-active URB. Exploitation requires local access and an MDC800 device that times out; repeated resubmission raises a kernel warning and interrupts the affected system.

CVSS severity5.5
Medium
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A USB driver flaw in Linux Kernel allows local users to interrupt system availability through repeated reads after an MDC800 device timeout. In mdc800_device_read(), a timeout returns without canceling download_urb, and the next read resubmits the still-active URB. Exploitation requires local access and an MDC800 device that times out; repeated resubmission raises a kernel warning and interrupts the affected system.

The record

CVE
CVE-2026-43425
Published
May 8, 2026
Updated
May 8, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 8, 2026CVE publishedPublication date reported by the CVE source.
  2. May 8, 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 <15536f6c15f48037a1672cbdea53266d67861ff6
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <155f471e38aa516f6c58c2ae03ca3dc222fa2fdb
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1be3b77de4eb89af8ae2fd6610546be778e25589
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <9bf877cc67309b2a063b0087c3ad8585fb11cec3
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <9fa5a49760979ba016506fe292a431c8b83f043e
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b7fed917f84e484e06c5e9926746d0b524e3a93e
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <cc7398447810c9450c90d092efe9997569f8d96f
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d4a400a6a4c4d49f77a04a3f401df5ae1a10657c

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <15536f6c15f48037a1672cbdea53266d67861ff6; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <155f471e38aa516f6c58c2ae03ca3dc222fa2fdb; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1be3b77de4eb89af8ae2fd6610546be778e25589; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <9bf877cc67309b2a063b0087c3ad8585fb11cec3; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <9fa5a49760979ba016506fe292a431c8b83f043e; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b7fed917f84e484e06c5e9926746d0b524e3a93e; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <cc7398447810c9450c90d092efe9997569f8d96f; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d4a400a6a4c4d49f77a04a3f401df5ae1a10657c

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

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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