CVE-2023-53344

Kernel fault via unchecked copy failure

Published Sep 17, 2025 · Updated Sep 17, 2025

Use of uninitialized memory in the Linux kernel allows local users to trigger a kernel fault through a malformed CAN BCM write. The bcm_tx_setup function copies a message into newly allocated op->frames storage, then compares its len field even when memcpy_from_msg fails, leaving that field uninitialized. Reaching the path requires local access to submit an asynchronous CAN BCM socket write; the demonstrated consequence is a KMSAN-detected fault, with no documented data disclosure or code execution.

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

Use of uninitialized memory in the Linux kernel allows local users to trigger a kernel fault through a malformed CAN BCM write. The bcm_tx_setup function copies a message into newly allocated op->frames storage, then compares its len field even when memcpy_from_msg fails, leaving that field uninitialized. Reaching the path requires local access to submit an asynchronous CAN BCM socket write; the demonstrated consequence is a KMSAN-detected fault, with no documented data disclosure or code execution.

The record

CVE
CVE-2023-53344
Published
Sep 17, 2025
Updated
Sep 17, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-908, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 17, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 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=4.8
  2. Affected versionversion=6f3b911d5f29b98752e5da86a295210c0c4f4e14 <2b4c99f7d9a57ecd644eda9b1fb0a1072414959f
  3. Affected versionversion=6f3b911d5f29b98752e5da86a295210c0c4f4e14 <2e6ad51c709fa794e0ce26003c9c9cd944e3383a
  4. Affected versionversion=6f3b911d5f29b98752e5da86a295210c0c4f4e14 <3fa0f1e0e31b1b73cdf59d4c36c7242e6ef821be
  5. Affected versionversion=6f3b911d5f29b98752e5da86a295210c0c4f4e14 <618b15d09fed6126356101543451d49860db4388
  6. Affected versionversion=6f3b911d5f29b98752e5da86a295210c0c4f4e14 <78bc7f0ab99458221224d3ab97199c0f8e6861f1
  7. Affected versionversion=6f3b911d5f29b98752e5da86a295210c0c4f4e14 <ab2a55907823f0bca56b6d03ea05e4071ba8535f
  8. Affected versionversion=6f3b911d5f29b98752e5da86a295210c0c4f4e14 <bf70e0eab64c625da84d9fdf4e84466b79418920
  9. Affected versionversion=6f3b911d5f29b98752e5da86a295210c0c4f4e14 <c11dbc7705b3739974ac31a13f4ab81e61a5fb07

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.8; version=6f3b911d5f29b98752e5da86a295210c0c4f4e14 <2b4c99f7d9a57ecd644eda9b1fb0a1072414959f; version=6f3b911d5f29b98752e5da86a295210c0c4f4e14 <2e6ad51c709fa794e0ce26003c9c9cd944e3383a; version=6f3b911d5f29b98752e5da86a295210c0c4f4e14 <3fa0f1e0e31b1b73cdf59d4c36c7242e6ef821be; version=6f3b911d5f29b98752e5da86a295210c0c4f4e14 <618b15d09fed6126356101543451d49860db4388; version=6f3b911d5f29b98752e5da86a295210c0c4f4e14 <78bc7f0ab99458221224d3ab97199c0f8e6861f1; version=6f3b911d5f29b98752e5da86a295210c0c4f4e14 <ab2a55907823f0bca56b6d03ea05e4071ba8535f; version=6f3b911d5f29b98752e5da86a295210c0c4f4e14 <bf70e0eab64c625da84d9fdf4e84466b79418920; version=6f3b911d5f29b98752e5da86a295210c0c4f4e14 <c11dbc7705b3739974ac31a13f4ab81e61a5fb07

Published CVSS scores

5.5CISA ADP VulnrichmentCVSS: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-908Use of Uninitialized Resource
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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