CVE-2026-23334

Service interruption via unchecked short interrupt URB

Published Mar 25, 2026 · Updated Mar 25, 2026

Improper input validation in the f81604 CAN USB driver allows local users to interrupt Linux kernel service via a short interrupt URB. The f81604_read_int_callback function consumed the interrupt data structure without first verifying that urb->actual_length covered it. Reachability requires the f81604 driver and a USB device able to return malformed interrupt data; public sources do not identify whether interruption is a hang, crash, or reboot.

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

Improper input validation in the f81604 CAN USB driver allows local users to interrupt Linux kernel service via a short interrupt URB. The f81604_read_int_callback function consumed the interrupt data structure without first verifying that urb->actual_length covered it. Reachability requires the f81604 driver and a USB device able to return malformed interrupt data; public sources do not identify whether interruption is a hang, crash, or reboot.

The record

CVE
CVE-2026-23334
Published
Mar 25, 2026
Updated
Mar 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 25, 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=6.5
  2. Affected versionversion=88da17436973e463bed59bea79771fb03a21555e <36ead57443146e6b730ce1f48ca3e9b17e19a3d2
  3. Affected versionversion=88da17436973e463bed59bea79771fb03a21555e <66615e6293388f75a56226d1216fd9cfb3d95e05
  4. Affected versionversion=88da17436973e463bed59bea79771fb03a21555e <7299b1b39a255f6092ce4ec0b65f66e9d6a357af
  5. Affected versionversion=88da17436973e463bed59bea79771fb03a21555e <9b740ff5bc649575a5e14ca8ee54e3dd5010aaf0
  6. Affected versionversion=88da17436973e463bed59bea79771fb03a21555e <c5d69da6c919648838734097861e979677eedcde

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.5; version=88da17436973e463bed59bea79771fb03a21555e <36ead57443146e6b730ce1f48ca3e9b17e19a3d2; version=88da17436973e463bed59bea79771fb03a21555e <66615e6293388f75a56226d1216fd9cfb3d95e05; version=88da17436973e463bed59bea79771fb03a21555e <7299b1b39a255f6092ce4ec0b65f66e9d6a357af; version=88da17436973e463bed59bea79771fb03a21555e <9b740ff5bc649575a5e14ca8ee54e3dd5010aaf0; version=88da17436973e463bed59bea79771fb03a21555e <c5d69da6c919648838734097861e979677eedcde

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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