CVE-2024-55639

Kernel crash via premature device-tree node release

Published Jan 11, 2025 · Updated Aug 5, 2026

Use-after-free in the Linux kernel rswitch driver allows local users to crash the system through device-tree node reuse. The rswitch_device_alloc function releases rdev->np_port after reading its Ethernet address even though later initialization retains and dereferences that device-tree node. The faulty path requires the Renesas Ethernet Switch driver and matching device-tree hardware; successful triggering interrupts the host.

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

Use-after-free in the Linux kernel rswitch driver allows local users to crash the system through device-tree node reuse. The rswitch_device_alloc function releases rdev->np_port after reading its Ethernet address even though later initialization retains and dereferences that device-tree node. The faulty path requires the Renesas Ethernet Switch driver and matching device-tree hardware; successful triggering interrupts the host.

The record

CVE
CVE-2024-55639
Published
Jan 11, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 11, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=6.3
  2. Affected versionversion=b46f1e5793298c67efc2f1b917350a2cefacf9d6 <66b7e9f85b8459c823b11e9af69dbf4be5eb6be8
  3. Affected versionversion=b46f1e5793298c67efc2f1b917350a2cefacf9d6 <92007a28f95413058a7268dc84e5f44b700165d1
  4. Affected versionversion=b46f1e5793298c67efc2f1b917350a2cefacf9d6 <bf8c6755f02029d1eddc3ff19b870240f054afc7

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.3; version=b46f1e5793298c67efc2f1b917350a2cefacf9d6 <66b7e9f85b8459c823b11e9af69dbf4be5eb6be8; version=b46f1e5793298c67efc2f1b917350a2cefacf9d6 <92007a28f95413058a7268dc84e5f44b700165d1; version=b46f1e5793298c67efc2f1b917350a2cefacf9d6 <bf8c6755f02029d1eddc3ff19b870240f054afc7

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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

No sourced classifications are available.

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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