CVE-2023-52878

Kernel crash via unchecked CAN echo index

Published May 21, 2024 · Updated May 11, 2026

Out-of-bounds read in the Linux kernel CAN echo path allows local users to crash the kernel through an invalid echo-buffer index. can_put_echo_skb() indexed can_priv::echo_skb before confirming that idx was below echo_skb_max, allowing an invalid driver-supplied index to access beyond the array. Exploitation requires local low-privilege access and a CAN interface path that passes an out-of-range echo index; the demonstrated consequence is a kernel crash.

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

Out-of-bounds read in the Linux kernel CAN echo path allows local users to crash the kernel through an invalid echo-buffer index. can_put_echo_skb() indexed can_priv::echo_skb before confirming that idx was below echo_skb_max, allowing an invalid driver-supplied index to access beyond the array. Exploitation requires local low-privilege access and a CAN interface path that passes an out-of-range echo index; the demonstrated consequence is a kernel crash.

The record

CVE
CVE-2023-52878
Published
May 21, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-125, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 21, 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=2.6.33
  2. Affected versionversion=a6e4bc5304033e434fabccabb230b8e9ff55d76f <0d30931f1fa0fb893fb7d5dc32b6b7edfb775be4
  3. Affected versionversion=a6e4bc5304033e434fabccabb230b8e9ff55d76f <53c468008a7c9ca3f5fc985951f35ec2acae85bc
  4. Affected versionversion=a6e4bc5304033e434fabccabb230b8e9ff55d76f <6411959c10fe917288cbb1038886999148560057
  5. Affected versionversion=a6e4bc5304033e434fabccabb230b8e9ff55d76f <826120c9ba68f2d0dbae58e99013929c883d1444
  6. Affected versionversion=a6e4bc5304033e434fabccabb230b8e9ff55d76f <8ab67da060157362b2e0926692c659808784708f

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.33; version=a6e4bc5304033e434fabccabb230b8e9ff55d76f <0d30931f1fa0fb893fb7d5dc32b6b7edfb775be4; version=a6e4bc5304033e434fabccabb230b8e9ff55d76f <53c468008a7c9ca3f5fc985951f35ec2acae85bc; version=a6e4bc5304033e434fabccabb230b8e9ff55d76f <6411959c10fe917288cbb1038886999148560057; version=a6e4bc5304033e434fabccabb230b8e9ff55d76f <826120c9ba68f2d0dbae58e99013929c883d1444; version=a6e4bc5304033e434fabccabb230b8e9ff55d76f <8ab67da060157362b2e0926692c659808784708f

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 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

CWE-125Out-of-bounds Read
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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