CVE-2024-46706

Boot hang via premature LPUART runtime suspend

Published Sep 13, 2024 · Updated May 11, 2026

A boot-time denial of service in Linux allows attackers to hang affected systems through early console output during initialization. In drivers/tty/serial/fsl_lpuart.c, uart_add_one_port probes a runtime-PM-enabled child before the normal console is ready, allowing the parent LPUART to suspend prematurely. The condition requires an fsl_lpuart controller and earlycon with initcall_debug=1 and loglevel=8; earlycon putchar then waits indefinitely for UARTSTAT TRDE.

CVSS severity5.5
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A boot-time denial of service in Linux allows attackers to hang affected systems through early console output during initialization. In drivers/tty/serial/fsl_lpuart.c, uart_add_one_port probes a runtime-PM-enabled child before the normal console is ready, allowing the parent LPUART to suspend prematurely. The condition requires an fsl_lpuart controller and earlycon with initcall_debug=1 and loglevel=8; earlycon putchar then waits indefinitely for UARTSTAT TRDE.

The record

CVE
CVE-2024-46706
Published
Sep 13, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 13, 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=43543e6f539b3e646348c253059f75e27d63c94d <3ecf625d4acb71d726bc0b49403cf68388b3d58d
  2. Affected versionversion=43543e6f539b3e646348c253059f75e27d63c94d <8eb92cfca6c2c5a15ab1773f3d18ab8d8f7dbb68
  3. Affected versionversion=43543e6f539b3e646348c253059f75e27d63c94d <dc98d76a15bc29a9a4e76f2f65f39f3e590fb15c
  4. Affected versionversion=6.2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=43543e6f539b3e646348c253059f75e27d63c94d <3ecf625d4acb71d726bc0b49403cf68388b3d58d; version=43543e6f539b3e646348c253059f75e27d63c94d <8eb92cfca6c2c5a15ab1773f3d18ab8d8f7dbb68; version=43543e6f539b3e646348c253059f75e27d63c94d <dc98d76a15bc29a9a4e76f2f65f39f3e590fb15c; version=6.2

Published CVSS scores

5.5NISTCVSS: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

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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