CVE-2026-23080

Local service interruption via unanchored USB URBs

Published Feb 4, 2026 · Updated Feb 4, 2026

Resource leak in affected Linux Kernel releases from 4.12 allows local users to exhaust kernel memory through completed mcba_usb USB-in URBs. The mcba_usb_read_bulk_callback function resubmits each completed receive URB after the USB core removes it from priv->rx_submitted, so mcba_urb_unlink cannot release it during close. Access to a system using the Microchip CAN BUS Analyzer USB driver is required, and repeated completions can interrupt service by consuming kernel memory.

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 affected Linux Kernel releases from 4.12 allows local users to exhaust kernel memory through completed mcba_usb USB-in URBs. The mcba_usb_read_bulk_callback function resubmits each completed receive URB after the USB core removes it from priv->rx_submitted, so mcba_urb_unlink cannot release it during close. Access to a system using the Microchip CAN BUS Analyzer USB driver is required, and repeated completions can interrupt service by consuming kernel memory.

The record

CVE
CVE-2026-23080
Published
Feb 4, 2026
Updated
Feb 4, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-401, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 4, 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=4.12
  2. Affected versionversion=51f3baad7de943780ce0c17bd7975df567dd6e14 <179f6f0cf5ae489743273b7c1644324c0c477ea9
  3. Affected versionversion=51f3baad7de943780ce0c17bd7975df567dd6e14 <710a7529fb13c5a470258ff5508ed3c498d54729
  4. Affected versionversion=51f3baad7de943780ce0c17bd7975df567dd6e14 <94c9f6f7b953f6382fef4bdc48c046b861b8868f
  5. Affected versionversion=51f3baad7de943780ce0c17bd7975df567dd6e14 <d374d715e338dfc3804aaa006fa6e470ffebb264

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=4.12; version=51f3baad7de943780ce0c17bd7975df567dd6e14 <179f6f0cf5ae489743273b7c1644324c0c477ea9; version=51f3baad7de943780ce0c17bd7975df567dd6e14 <710a7529fb13c5a470258ff5508ed3c498d54729; version=51f3baad7de943780ce0c17bd7975df567dd6e14 <94c9f6f7b953f6382fef4bdc48c046b861b8868f; version=51f3baad7de943780ce0c17bd7975df567dd6e14 <d374d715e338dfc3804aaa006fa6e470ffebb264

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-401Missing Release of Memory after Effective Lifetime
T1499.004Application 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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