CVE-2023-52843

Local service interruption via unchecked MAC header

Published May 21, 2024 · Updated May 11, 2026

Uninitialized data use in affected Linux kernels allows local users to interrupt kernel service through a crafted TUN packet. LLC calls eth_hdr in llc_rcv and related paths before verifying that the socket buffer contains an Ethernet MAC header, causing header fields to be read from uninitialized data. Reaching the flaw requires access to an owned TUN device or CAP_NET_ADMIN to create one, and the reported consequence is limited to kernel service interruption.

CVSS severity5.5
Medium
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uninitialized data use in affected Linux kernels allows local users to interrupt kernel service through a crafted TUN packet. LLC calls eth_hdr in llc_rcv and related paths before verifying that the socket buffer contains an Ethernet MAC header, causing header fields to be read from uninitialized data. Reaching the flaw requires access to an owned TUN device or CAP_NET_ADMIN to create one, and the reported consequence is limited to kernel service interruption.

The record

CVE
CVE-2023-52843
Published
May 21, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-908, T1499
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=2.6.25
  2. Affected versionversion=f83f1768f833cb45bc93429fdc552252a4f55ac3 <0a720d0259ad3521ec6c9e4199f9f6fc75bac77a
  3. Affected versionversion=f83f1768f833cb45bc93429fdc552252a4f55ac3 <352887b3edd007cf9b0abc30fe9d98622acd859b
  4. Affected versionversion=f83f1768f833cb45bc93429fdc552252a4f55ac3 <3a2653828ffc6101aef80bf58d5b77484239f779
  5. Affected versionversion=f83f1768f833cb45bc93429fdc552252a4f55ac3 <7b3ba18703a63f6fd487183b9262b08e5632da1b
  6. Affected versionversion=f83f1768f833cb45bc93429fdc552252a4f55ac3 <900a4418e3f66a32db6baaf23f92b99c20ae6535
  7. Affected versionversion=f83f1768f833cb45bc93429fdc552252a4f55ac3 <9a3f9054a5227d7567cba1fb821df48ccecad10c
  8. Affected versionversion=f83f1768f833cb45bc93429fdc552252a4f55ac3 <cbdcdf42d15dac74c7287679fb2a9d955f8feb1f
  9. Affected versionversion=f83f1768f833cb45bc93429fdc552252a4f55ac3 <f980e9a57dfb9530f1f4ee41a2420f2a256d7b29
  10. Affected versionversion=f83f1768f833cb45bc93429fdc552252a4f55ac3 <ff5cb6a4f0c6d7fbdc84858323fb4b7af32cfd79

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.25; version=f83f1768f833cb45bc93429fdc552252a4f55ac3 <0a720d0259ad3521ec6c9e4199f9f6fc75bac77a; version=f83f1768f833cb45bc93429fdc552252a4f55ac3 <352887b3edd007cf9b0abc30fe9d98622acd859b; version=f83f1768f833cb45bc93429fdc552252a4f55ac3 <3a2653828ffc6101aef80bf58d5b77484239f779; version=f83f1768f833cb45bc93429fdc552252a4f55ac3 <7b3ba18703a63f6fd487183b9262b08e5632da1b; version=f83f1768f833cb45bc93429fdc552252a4f55ac3 <900a4418e3f66a32db6baaf23f92b99c20ae6535; version=f83f1768f833cb45bc93429fdc552252a4f55ac3 <9a3f9054a5227d7567cba1fb821df48ccecad10c; version=f83f1768f833cb45bc93429fdc552252a4f55ac3 <cbdcdf42d15dac74c7287679fb2a9d955f8feb1f; version=f83f1768f833cb45bc93429fdc552252a4f55ac3 <f980e9a57dfb9530f1f4ee41a2420f2a256d7b29; version=f83f1768f833cb45bc93429fdc552252a4f55ac3 <ff5cb6a4f0c6d7fbdc84858323fb4b7af32cfd79

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5UbuntuCVSS: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-908Use of Uninitialized Resource
T1499Endpoint Denial of Service

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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