CVE-2026-23357

CAN service hang via error-path IRQ deadlock

Published Mar 25, 2026 · Updated Mar 25, 2026

Improper locking in the Linux Kernel mcp251x CAN driver allows local users to hang the driver while opening a CAN interface. In mcp251x_open(), the error path calls free_irq() while holding mpc_lock, so a prior interrupt handler waiting on that mutex and free_irq() wait indefinitely for each other. The affected MCP251x driver and a concurrent interrupt during open-error handling are required; the resulting deadlock interrupts CAN service.

CVSS severity5.5
Medium
EPSS probability0.10%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper locking in the Linux Kernel mcp251x CAN driver allows local users to hang the driver while opening a CAN interface. In mcp251x_open(), the error path calls free_irq() while holding mpc_lock, so a prior interrupt handler waiting on that mutex and free_irq() wait indefinitely for each other. The affected MCP251x driver and a concurrent interrupt during open-error handling are required; the resulting deadlock interrupts CAN service.

The record

CVE
CVE-2026-23357
Published
Mar 25, 2026
Updated
Mar 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-667, CAPEC-25, 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

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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=2.6.34
  2. Affected versionversion=bf66f3736a945dd4e92d86427276c6eeab0a6c1d <256f0cff6e946c570392bda1d01a65e789a7afd0
  3. Affected versionversion=bf66f3736a945dd4e92d86427276c6eeab0a6c1d <38063cc435b69d56e76f947c10d336fcb2953508
  4. Affected versionversion=bf66f3736a945dd4e92d86427276c6eeab0a6c1d <ab3f894de216f4a62adc3b57e9191888cbf26885
  5. Affected versionversion=bf66f3736a945dd4e92d86427276c6eeab0a6c1d <b73832292cd914e87a55e863ba4413a907e7db6b
  6. Affected versionversion=bf66f3736a945dd4e92d86427276c6eeab0a6c1d <d27f12c3f5e85efc479896af4a69eccb37f75e8e
  7. Affected versionversion=bf66f3736a945dd4e92d86427276c6eeab0a6c1d <e728f444c913a91d290d1824b4770780bbd6378e

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=2.6.34; version=bf66f3736a945dd4e92d86427276c6eeab0a6c1d <256f0cff6e946c570392bda1d01a65e789a7afd0; version=bf66f3736a945dd4e92d86427276c6eeab0a6c1d <38063cc435b69d56e76f947c10d336fcb2953508; version=bf66f3736a945dd4e92d86427276c6eeab0a6c1d <ab3f894de216f4a62adc3b57e9191888cbf26885; version=bf66f3736a945dd4e92d86427276c6eeab0a6c1d <b73832292cd914e87a55e863ba4413a907e7db6b; version=bf66f3736a945dd4e92d86427276c6eeab0a6c1d <d27f12c3f5e85efc479896af4a69eccb37f75e8e; version=bf66f3736a945dd4e92d86427276c6eeab0a6c1d <e728f444c913a91d290d1824b4770780bbd6378e

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

CWE-667Improper Locking
CAPEC-25Forced Deadlock
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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