CVE-2026-43426

Kernel memory corruption via removal-time ISR race

Published May 8, 2026 · Updated May 8, 2026

Use-after-free in the renesas_usbhs driver in affected Linux Kernel releases allows local users to corrupt kernel memory during device removal. The usbhs_remove() path frees the pipe array before disabling and synchronizing usbhs_interrupt, so an interrupt can dereference the released array. Exploitation requires root or CAP_SYS_ADMIN access to the sysfs unbind control and a hardware interrupt during a narrow, unreliable race window.

CVSS severity7.8
High
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the renesas_usbhs driver in affected Linux Kernel releases allows local users to corrupt kernel memory during device removal. The usbhs_remove() path frees the pipe array before disabling and synchronizing usbhs_interrupt, so an interrupt can dereference the released array. Exploitation requires root or CAP_SYS_ADMIN access to the sysfs unbind control and a hardware interrupt during a narrow, unreliable race window.

The record

CVE
CVE-2026-43426
Published
May 8, 2026
Updated
May 8, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-416
Attack vector
local
Privileges
admin

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=3.0
  2. Affected versionversion=f1407d5c66240b33d11a7f1a41d55ccf6a9d7647 <0b7d11fd6e742ecc0b1eca44b4f0b93140c74bae
  3. Affected versionversion=f1407d5c66240b33d11a7f1a41d55ccf6a9d7647 <1899edac312ef17a7234851686e8a703f56d0a84
  4. Affected versionversion=f1407d5c66240b33d11a7f1a41d55ccf6a9d7647 <3cbc242b88c607f55da3d0d0d336b49bf1e20412
  5. Affected versionversion=f1407d5c66240b33d11a7f1a41d55ccf6a9d7647 <51afaf919bbaacdd9cc9e146033ae0a743a42dd7
  6. Affected versionversion=f1407d5c66240b33d11a7f1a41d55ccf6a9d7647 <6287e0c01ccb818e7214f88d885ffb7c9e81b0e0
  7. Affected versionversion=f1407d5c66240b33d11a7f1a41d55ccf6a9d7647 <6ffe44f022c95b1b29c691d2169c5abc046f7580
  8. Affected versionversion=f1407d5c66240b33d11a7f1a41d55ccf6a9d7647 <9c6159d5b72d5fc265cce5da04f27d730b552e69
  9. Affected versionversion=f1407d5c66240b33d11a7f1a41d55ccf6a9d7647 <c7012fc73dab4829404fedeeaa8531f12ac8545f

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linux Kernelversion=3.0; version=f1407d5c66240b33d11a7f1a41d55ccf6a9d7647 <0b7d11fd6e742ecc0b1eca44b4f0b93140c74bae; version=f1407d5c66240b33d11a7f1a41d55ccf6a9d7647 <1899edac312ef17a7234851686e8a703f56d0a84; version=f1407d5c66240b33d11a7f1a41d55ccf6a9d7647 <3cbc242b88c607f55da3d0d0d336b49bf1e20412; version=f1407d5c66240b33d11a7f1a41d55ccf6a9d7647 <51afaf919bbaacdd9cc9e146033ae0a743a42dd7; version=f1407d5c66240b33d11a7f1a41d55ccf6a9d7647 <6287e0c01ccb818e7214f88d885ffb7c9e81b0e0; version=f1407d5c66240b33d11a7f1a41d55ccf6a9d7647 <6ffe44f022c95b1b29c691d2169c5abc046f7580; version=f1407d5c66240b33d11a7f1a41d55ccf6a9d7647 <9c6159d5b72d5fc265cce5da04f27d730b552e69; version=f1407d5c66240b33d11a7f1a41d55ccf6a9d7647 <c7012fc73dab4829404fedeeaa8531f12ac8545f

Published CVSS scores

7.8NIST National Vulnerability DatabaseCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free

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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