CVE-2021-47204

Local kernel compromise via post-free device logging

Published Apr 10, 2024 · Updated May 11, 2026

Use-after-free in the Linux kernel allows local users to crash or compromise a system during DPAA2 Ethernet device removal. dpaa2_eth_remove calls free_netdev() and then passes the released net_device object to netdev_info() while logging device removal. Reaching the flaw requires local access that triggers removal or unbinding of a DPNI interface on supported Freescale hardware; the stale access can corrupt kernel memory, crash the host, or enable kernel-level compromise.

CVSS severity7.8
High
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the Linux kernel allows local users to crash or compromise a system during DPAA2 Ethernet device removal. dpaa2_eth_remove calls free_netdev() and then passes the released net_device object to netdev_info() while logging device removal. Reaching the flaw requires local access that triggers removal or unbinding of a DPNI interface on supported Freescale hardware; the stale access can corrupt kernel memory, crash the host, or enable kernel-level compromise.

The record

CVE
CVE-2021-47204
Published
Apr 10, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 10, 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.17
  2. Affected versionversion=7472dd9f649958be6a8880ed439233c8414a7b34 <1c4099dc0d6a01e76e4f7dd98e4b3e0d55d80ad9
  3. Affected versionversion=7472dd9f649958be6a8880ed439233c8414a7b34 <32d4686224744819ddcae58b666c21d2a4ef4c88
  4. Affected versionversion=7472dd9f649958be6a8880ed439233c8414a7b34 <9b5a333272a48c2f8b30add7a874e46e8b26129c
  5. Affected versionversion=7472dd9f649958be6a8880ed439233c8414a7b34 <d74ff10ed2d93dc9b67e99a74b36fb9a83273d8a

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.17; version=7472dd9f649958be6a8880ed439233c8414a7b34 <1c4099dc0d6a01e76e4f7dd98e4b3e0d55d80ad9; version=7472dd9f649958be6a8880ed439233c8414a7b34 <32d4686224744819ddcae58b666c21d2a4ef4c88; version=7472dd9f649958be6a8880ed439233c8414a7b34 <9b5a333272a48c2f8b30add7a874e46e8b26129c; version=7472dd9f649958be6a8880ed439233c8414a7b34 <d74ff10ed2d93dc9b67e99a74b36fb9a83273d8a

Published CVSS scores

4.4Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
5.5SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.8NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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-416Use After Free
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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