CVE-2023-54039

Service interruption via J1939 control-buffer over-read

Published Dec 24, 2025 · Updated Dec 24, 2025

Out-of-bounds read in Linux kernel J1939 transport allows local users to interrupt the system through crafted CAN traffic. j1939_tp_tx_dat_new() copies the full skb->cb size from a smaller j1939_sk_buff_cb structure, reading beyond the structure boundary. Reachability requires local low-privileged access and execution of the J1939 transport path; no confidentiality or integrity impact is published.

CVSS severity5.5
Medium
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in Linux kernel J1939 transport allows local users to interrupt the system through crafted CAN traffic. j1939_tp_tx_dat_new() copies the full skb->cb size from a smaller j1939_sk_buff_cb structure, reading beyond the structure boundary. Reachability requires local low-privileged access and execution of the J1939 transport path; no confidentiality or integrity impact is published.

The record

CVE
CVE-2023-54039
Published
Dec 24, 2025
Updated
Dec 24, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 24, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 24, 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=5.4
  2. Affected versionversion=9d71dd0c70099914fcd063135da3c580865e924c <36befc9aed6202b4a9b906529aea13eacd7e34ff
  3. Affected versionversion=9d71dd0c70099914fcd063135da3c580865e924c <4c3fb22a6ec68258ee129a2e6b720f43dffc562f
  4. Affected versionversion=9d71dd0c70099914fcd063135da3c580865e924c <4fe1d9b6231a68ffc91318f57fd8e4982f028cf7
  5. Affected versionversion=9d71dd0c70099914fcd063135da3c580865e924c <70caa596d158a5d84b117f722d58f3ea503a5ba9
  6. Affected versionversion=9d71dd0c70099914fcd063135da3c580865e924c <b45193cb4df556fe6251b285a5ce44046dd36b4a
  7. Affected versionversion=9d71dd0c70099914fcd063135da3c580865e924c <d2136f05690c272dfc9f9d6efcc51d5f53494b33

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.4; version=9d71dd0c70099914fcd063135da3c580865e924c <36befc9aed6202b4a9b906529aea13eacd7e34ff; version=9d71dd0c70099914fcd063135da3c580865e924c <4c3fb22a6ec68258ee129a2e6b720f43dffc562f; version=9d71dd0c70099914fcd063135da3c580865e924c <4fe1d9b6231a68ffc91318f57fd8e4982f028cf7; version=9d71dd0c70099914fcd063135da3c580865e924c <70caa596d158a5d84b117f722d58f3ea503a5ba9; version=9d71dd0c70099914fcd063135da3c580865e924c <b45193cb4df556fe6251b285a5ce44046dd36b4a; version=9d71dd0c70099914fcd063135da3c580865e924c <d2136f05690c272dfc9f9d6efcc51d5f53494b33

Published CVSS scores

5.5SUSECVSS: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 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

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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