CVE-2023-2166

Local system crash via CAN receive filtering

Published Apr 19, 2023 · Updated Feb 5, 2025

Null pointer dereference in Linux Kernel before 6.1-rc9 allows local users to crash the system through CAN frame reception. The can_rcv_filter path treats bonding or TUN devices claiming the CAN type as initialized CAN devices and dereferences an unset ml_priv pointer. Local access is required, and successful exploitation interrupts the entire host without reported data disclosure or modification.

CVSS severity5.5
Medium
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Null pointer dereference in Linux Kernel before 6.1-rc9 allows local users to crash the system through CAN frame reception. The can_rcv_filter path treats bonding or TUN devices claiming the CAN type as initialized CAN devices and dereferences an unset ml_priv pointer. Local access is required, and successful exploitation interrupts the entire host without reported data disclosure or modification.

The record

CVE
CVE-2023-2166
Published
Apr 19, 2023
Updated
Feb 5, 2025
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-476, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 19, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 5, 2025Record 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=Linux Kernel version prior to Kernel 6.1 RC9

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=Linux Kernel version prior to Kernel 6.1 RC9

Published CVSS scores

5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5CISA-ADPCVSS: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

CWE-476NULL Pointer Dereference
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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