CVE-2024-42076

Kernel memory disclosure via uninitialized J1939 frame

Published Jul 29, 2024 · Updated May 11, 2026

Information disclosure in the Linux kernel J1939 CAN subsystem allows local users to read uninitialized kernel memory through raw CAN sockets. j1939_send_one() builds a full 16-byte CAN frame but leaves bytes 12–15 uninitialized, and raw_recvmsg() copies those bytes to user space. A low-privileged local user must reach the J1939 send path and read from a raw CAN socket; the demonstrated consequence is disclosure of four kernel-memory bytes per frame.

CVSS severity5.5
Medium
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in the Linux kernel J1939 CAN subsystem allows local users to read uninitialized kernel memory through raw CAN sockets. j1939_send_one() builds a full 16-byte CAN frame but leaves bytes 12–15 uninitialized, and raw_recvmsg() copies those bytes to user space. A low-privileged local user must reach the J1939 send path and read from a raw CAN socket; the demonstrated consequence is disclosure of four kernel-memory bytes per frame.

The record

CVE
CVE-2024-42076
Published
Jul 29, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-908, T1005
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 29, 2024CVE publishedPublication date reported by the CVE source.
  2. May 11, 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=5.4
  2. Affected versionversion=9d71dd0c70099914fcd063135da3c580865e924c <4c5dc3927e17489c1cae6f48c0d5e4acb4cae01f
  3. Affected versionversion=9d71dd0c70099914fcd063135da3c580865e924c <5e4ed38eb17eaca42de57d500cc0f9668d2b6abf
  4. Affected versionversion=9d71dd0c70099914fcd063135da3c580865e924c <a2a0ebff7fdeb2f66e29335adf64b9e457300dd4
  5. Affected versionversion=9d71dd0c70099914fcd063135da3c580865e924c <ab2a683938ba4416d389c2f5651cbbb2c41b779f
  6. Affected versionversion=9d71dd0c70099914fcd063135da3c580865e924c <b7cdf1dd5d2a2d8200efd98d1893684db48fe134
  7. Affected versionversion=9d71dd0c70099914fcd063135da3c580865e924c <ba7e5ae8208ac07d8e1eace0951a34c169a2d298
  8. Affected versionversion=9d71dd0c70099914fcd063135da3c580865e924c <f97cbce633923588307049c4aef9feb2987e371b

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.4; version=9d71dd0c70099914fcd063135da3c580865e924c <4c5dc3927e17489c1cae6f48c0d5e4acb4cae01f; version=9d71dd0c70099914fcd063135da3c580865e924c <5e4ed38eb17eaca42de57d500cc0f9668d2b6abf; version=9d71dd0c70099914fcd063135da3c580865e924c <a2a0ebff7fdeb2f66e29335adf64b9e457300dd4; version=9d71dd0c70099914fcd063135da3c580865e924c <ab2a683938ba4416d389c2f5651cbbb2c41b779f; version=9d71dd0c70099914fcd063135da3c580865e924c <b7cdf1dd5d2a2d8200efd98d1893684db48fe134; version=9d71dd0c70099914fcd063135da3c580865e924c <ba7e5ae8208ac07d8e1eace0951a34c169a2d298; version=9d71dd0c70099914fcd063135da3c580865e924c <f97cbce633923588307049c4aef9feb2987e371b

Published CVSS scores

5.5Canonical UbuntuCVSS: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
T1005Data from Local System

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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