CVE-2026-23347

Local service interruption via unanchored USB requests

Published Mar 25, 2026 · Updated Mar 25, 2026

Resource leak in the Linux Kernel f81604 CAN USB driver from 6.5 allows local users to interrupt service during device teardown. The f81604_read_bulk_callback function resubmits a USB request before adding it to the driver's URB anchor, so usb_kill_anchored_urbs cannot cancel and release that request. Exploitation requires low-privilege local access and the affected driver path; the published assessment limits impact to availability.

CVSS severity5.5
Medium
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

Resource leak in the Linux Kernel f81604 CAN USB driver from 6.5 allows local users to interrupt service during device teardown. The f81604_read_bulk_callback function resubmits a USB request before adding it to the driver's URB anchor, so usb_kill_anchored_urbs cannot cancel and release that request. Exploitation requires low-privilege local access and the affected driver path; the published assessment limits impact to availability.

The record

CVE
CVE-2026-23347
Published
Mar 25, 2026
Updated
Mar 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499.004
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

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=6.5
  2. Affected versionversion=88da17436973e463bed59bea79771fb03a21555e <54ee74307165b348b2fddcd7942eb48fb4ee1237
  3. Affected versionversion=88da17436973e463bed59bea79771fb03a21555e <7724645c4792914cd07f36718816c5369cc57970
  4. Affected versionversion=88da17436973e463bed59bea79771fb03a21555e <952caa5da10bed22be09612433964f6877ba0dde
  5. Affected versionversion=88da17436973e463bed59bea79771fb03a21555e <c001214e12202338425d6dda5d2a1919d674282d
  6. Affected versionversion=88da17436973e463bed59bea79771fb03a21555e <f6d80b104f904a6da922907394eec66d3e2ffc57

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.5; version=88da17436973e463bed59bea79771fb03a21555e <54ee74307165b348b2fddcd7942eb48fb4ee1237; version=88da17436973e463bed59bea79771fb03a21555e <7724645c4792914cd07f36718816c5369cc57970; version=88da17436973e463bed59bea79771fb03a21555e <952caa5da10bed22be09612433964f6877ba0dde; version=88da17436973e463bed59bea79771fb03a21555e <c001214e12202338425d6dda5d2a1919d674282d; version=88da17436973e463bed59bea79771fb03a21555e <f6d80b104f904a6da922907394eec66d3e2ffc57

Published CVSS scores

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

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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

T1499.004Endpoint Denial of Service: Application or System Exploitation

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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