CVE-2024-44962

Kernel panic via rearmed driver timer

Published Sep 4, 2024 · Updated May 11, 2026

Denial of service in the Linux kernel btnxpuart driver allows local users to panic the kernel by unloading the module during timer activity. The unload path uses del_timer_sync(), which does not prevent the timer from being rearmed and invoked after the driver's code has been removed. Reaching the race requires local privileges to unload the btnxpuart module on hardware using that Bluetooth UART driver; success crashes the host.

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

Denial of service in the Linux kernel btnxpuart driver allows local users to panic the kernel by unloading the module during timer activity. The unload path uses del_timer_sync(), which does not prevent the timer from being rearmed and invoked after the driver's code has been removed. Reaching the race requires local privileges to unload the btnxpuart module on hardware using that Bluetooth UART driver; success crashes the host.

The record

CVE
CVE-2024-44962
Published
Sep 4, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 4, 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=6.4
  2. Affected versionversion=689ca16e523278470c38832a3010645a78c544d8 <0d0df1e750bac0fdaa77940e711c1625cff08d33
  3. Affected versionversion=689ca16e523278470c38832a3010645a78c544d8 <28bbb5011a9723700006da67bdb57ab6a914452b
  4. Affected versionversion=689ca16e523278470c38832a3010645a78c544d8 <4d9adcb94d55e9be8a3e464d9f2ff7d27e2ed016

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=6.4; version=689ca16e523278470c38832a3010645a78c544d8 <0d0df1e750bac0fdaa77940e711c1625cff08d33; version=689ca16e523278470c38832a3010645a78c544d8 <28bbb5011a9723700006da67bdb57ab6a914452b; version=689ca16e523278470c38832a3010645a78c544d8 <4d9adcb94d55e9be8a3e464d9f2ff7d27e2ed016

Published CVSS scores

5.5NVDCVSS: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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

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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