CVE-2024-43862

Carrier-detection hang via invalid nested locking

Published Aug 20, 2024 · Updated May 11, 2026

Improper locking in the QMC HDLC driver in Linux 6.9 through 6.10.3 and 6.11-rc1 allows local users to hang carrier detection. qmc_hdlc_framer_set_carrier holds the carrier_lock spinlock while calling framer_get_status, which attempts to acquire a mutex in an invalid wait context and deadlocks. The path requires the Freescale QMC HDLC driver to process a carrier change; published evidence reports availability loss, not data exposure or modification.

CVSS severity5.5
Medium
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper locking in the QMC HDLC driver in Linux 6.9 through 6.10.3 and 6.11-rc1 allows local users to hang carrier detection. qmc_hdlc_framer_set_carrier holds the carrier_lock spinlock while calling framer_get_status, which attempts to acquire a mutex in an invalid wait context and deadlocks. The path requires the Freescale QMC HDLC driver to process a carrier change; published evidence reports availability loss, not data exposure or modification.

The record

CVE
CVE-2024-43862
Published
Aug 20, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-667, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 20, 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=54762918ca856028d33d1d56d017a4d7706c6196 <c4d6a347ba7babdf9d90a0eb24048c266cae0532
  2. Affected versionversion=54762918ca856028d33d1d56d017a4d7706c6196 <f223d2b4acb7a45a6e0581cb380e1af1a6dc7ab9
  3. Affected versionversion=6.9

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=54762918ca856028d33d1d56d017a4d7706c6196 <c4d6a347ba7babdf9d90a0eb24048c266cae0532; version=54762918ca856028d33d1d56d017a4d7706c6196 <f223d2b4acb7a45a6e0581cb380e1af1a6dc7ab9; version=6.9

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

CWE-667Improper Locking
T1499.004Endpoint Denial of Service: Application 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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