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CVE-2024-43862net: wan: fsl_qmc_hdlc: Convert carrier_lock spinlock to a mutex

Description

In the Linux kernel, the following vulnerability has been resolved: net: wan: fsl_qmc_hdlc: Convert carrier_lock spinlock to a mutex The carrier_lock spinlock protects the carrier detection. While it is held, framer_get_status() is called which in turn takes a mutex. This is not correct and can lead to a deadlock. A run with PROVE_LOCKING enabled detected the issue: [ BUG: Invalid wait context ] ... c204ddbc (&framer->mutex){+.+.}-{3:3}, at: framer_get_status+0x40/0x78 other info that might help us debug this: context-{4:4} 2 locks held by ifconfig/146: #0: c0926a38 (rtnl_mutex){+.+.}-{3:3}, at: devinet_ioctl+0x12c/0x664 #1: c2006a40 (&qmc_hdlc->carrier_lock){....}-{2:2}, at: qmc_hdlc_framer_set_carrier+0x30/0x98 Avoid the spinlock usage and convert carrier_lock to a mutex.

Timeline

  1. ID reserved

    By Linux

  2. · 3 days later

    Published

  3. · 21 months later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2024-43862, by who scored it
Scored byCVSSScoreVector
NVDNVD · Analyzed3.1Medium5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS (exploitation in 30 days)
0.14% · top 97% of all CVEs (14 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.

Affected products

  • Linux · Linux

    • affected 54762918ca856028d33d1d56d017a4d7706c6196 – < f223d2b4acb7a45a6e0581cb380e1af1a6dc7ab9
    • affected 54762918ca856028d33d1d56d017a4d7706c6196 – < c4d6a347ba7babdf9d90a0eb24048c266cae0532

  • Linux · Linux

    • affected 6.9
    • unaffected < 6.9
    • unaffected 6.10.4 – ≤ 6.10.*
    • unaffected 6.11 – ≤ *

References

References2

Sources

The same CVE in the primary databases and aggregators, to check against.

Badge for a README or a ticket

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[![CVE-2024-43862](https://cveledger.app/badge/CVE-2024-43862.svg)](https://cveledger.app/cve/CVE-2024-43862)

Record last updated .