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CVE-2026-64373
cpufreq: Fix hotplug-suspend race during reboot
Overview
Description

In the Linux kernel, the following vulnerability has been resolved: cpufreq: Fix hotplug-suspend race during reboot During system reboot, cpufreq_suspend() is called via the kernel_restart() -> device_shutdown() path. Unlike the normal system suspend path, the reboot path does not call freeze_processes(), so userspace processes and kernel threads remain active. This allows CPU hotplug operations to run concurrently with cpufreq_suspend(). The original code has no synchronization with CPU hotplug, leading to a race condition where governor_data can be freed by the hotplug path while cpufreq_suspend() is still accessing it, resulting in a null pointer dereference: Unable to handle kernel NULL pointer dereference Call Trace: do_kernel_fault+0x28/0x3c cpufreq_suspend+0xdc/0x160 device_shutdown+0x18/0x200 kernel_restart+0x40/0x80 arm64_sys_reboot+0x1b0/0x200 Fix this by adding cpus_read_lock()/cpus_read_unlock() to cpufreq_suspend() to block CPU hotplug operations while suspend is in progress. [ rjw: Changelog edits ]

Details
INFO

Published Date :

July 25, 2026, 10:17 a.m.

Last Modified :

July 25, 2026, 10:17 a.m.

Remotely Exploit :

No

Source :

416baaa9-dc9f-4396-8d5f-8c081fb06d67
Impact
Affected Products

The following products are affected by CVE-2026-64373 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

No affected product recoded yet

: Total Affected Vendor : 0 | Products : 0
Solution
Add synchronization to cpufreq_suspend to block CPU hotplug during suspend.
  • Apply synchronization locks to cpufreq_suspend.
  • Block CPU hotplug operations during suspend.
  • Update the Linux kernel to the patched version.
References
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2026-64373.

URL Resource
https://git.kernel.org/stable/c/6d5dd354c37abaf4d60400c55c71f23ba2b33639
https://git.kernel.org/stable/c/6e175c00c62dca3d91b987015808b5d52e8db2b4
https://git.kernel.org/stable/c/73255d702c7560185fd5951aadcf7eb057c2f453
https://git.kernel.org/stable/c/9103078c7b3091a2fbb52af176f95982ee7dd7f8
https://git.kernel.org/stable/c/a0106b41f9a724868d390b8b3b4ea5ca0e04ea53
https://git.kernel.org/stable/c/a0ef2fc89d28ca62923376c4b8ffaa57136a36be
https://git.kernel.org/stable/c/a9029dd55696c651ee46912afa2a166fa456bb3e
https://git.kernel.org/stable/c/cd4524ff6567fa4458a5bec4b017105e671d393e
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-64373 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-64373 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2026-64373 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2026-64373 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Jul. 25, 2026

    Action Type Old Value New Value
    Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '65650b35133ff20f0c9ef0abd5c3c66dbce3ae57', 'lessThan': '6d5dd354c37abaf4d60400c55c71f23ba2b33639', 'versionType': 'git'}, {'status': 'affected', 'version': '65650b35133ff20f0c9ef0abd5c3c66dbce3ae57', 'lessThan': '9103078c7b3091a2fbb52af176f95982ee7dd7f8', 'versionType': 'git'}, {'status': 'affected', 'version': '65650b35133ff20f0c9ef0abd5c3c66dbce3ae57', 'lessThan': 'cd4524ff6567fa4458a5bec4b017105e671d393e', 'versionType': 'git'}, {'status': 'affected', 'version': '65650b35133ff20f0c9ef0abd5c3c66dbce3ae57', 'lessThan': '73255d702c7560185fd5951aadcf7eb057c2f453', 'versionType': 'git'}, {'status': 'affected', 'version': '65650b35133ff20f0c9ef0abd5c3c66dbce3ae57', 'lessThan': 'a0ef2fc89d28ca62923376c4b8ffaa57136a36be', 'versionType': 'git'}, {'status': 'affected', 'version': '65650b35133ff20f0c9ef0abd5c3c66dbce3ae57', 'lessThan': '6e175c00c62dca3d91b987015808b5d52e8db2b4', 'versionType': 'git'}, {'status': 'affected', 'version': '65650b35133ff20f0c9ef0abd5c3c66dbce3ae57', 'lessThan': 'a0106b41f9a724868d390b8b3b4ea5ca0e04ea53', 'versionType': 'git'}, {'status': 'affected', 'version': '65650b35133ff20f0c9ef0abd5c3c66dbce3ae57', 'lessThan': 'a9029dd55696c651ee46912afa2a166fa456bb3e', 'versionType': 'git'}, {'status': 'affected', 'version': '8bfa06ea6e81bf08d2132d7e70c2b5313b34caf8', 'versionType': 'git'}, {'status': 'affected', 'version': '7ccf3b8b7a12dc9da158c2e699c36d04b2496944', 'versionType': 'git'}, {'status': 'affected', 'version': '5f466713989250938624afa79dc33bae20920700', 'versionType': 'git'}, {'status': 'affected', 'version': '89ab39da1452d272007acc5912d4008047b86706', 'versionType': 'git'}, {'status': 'affected', 'version': 'cb4b4601f910c78d2b49f637a12ef98b41cb76a9', 'versionType': 'git'}, {'status': 'affected', 'version': '4.4.198', 'lessThan': '4.5', 'versionType': 'semver'}, {'status': 'affected', 'version': '4.9.198', 'lessThan': '4.10', 'versionType': 'semver'}, {'status': 'affected', 'version': '4.14.151', 'lessThan': '4.15', 'versionType': 'semver'}, {'status': 'affected', 'version': '4.19.81', 'lessThan': '4.20', 'versionType': 'semver'}, {'status': 'affected', 'version': '5.3.8', 'lessThan': '5.4', 'versionType': 'semver'}], 'programFiles': ['drivers/cpufreq/cpufreq.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '5.4'}, {'status': 'unaffected', 'version': '0', 'lessThan': '5.4', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.261', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.212', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.178', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.145', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.96', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.39', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.4', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/cpufreq/cpufreq.c'], 'defaultStatus': 'affected'}]
    Added Description In the Linux kernel, the following vulnerability has been resolved: cpufreq: Fix hotplug-suspend race during reboot During system reboot, cpufreq_suspend() is called via the kernel_restart() -> device_shutdown() path. Unlike the normal system suspend path, the reboot path does not call freeze_processes(), so userspace processes and kernel threads remain active. This allows CPU hotplug operations to run concurrently with cpufreq_suspend(). The original code has no synchronization with CPU hotplug, leading to a race condition where governor_data can be freed by the hotplug path while cpufreq_suspend() is still accessing it, resulting in a null pointer dereference: Unable to handle kernel NULL pointer dereference Call Trace: do_kernel_fault+0x28/0x3c cpufreq_suspend+0xdc/0x160 device_shutdown+0x18/0x200 kernel_restart+0x40/0x80 arm64_sys_reboot+0x1b0/0x200 Fix this by adding cpus_read_lock()/cpus_read_unlock() to cpufreq_suspend() to block CPU hotplug operations while suspend is in progress. [ rjw: Changelog edits ]
    Added Reference https://git.kernel.org/stable/c/6d5dd354c37abaf4d60400c55c71f23ba2b33639
    Added Reference https://git.kernel.org/stable/c/6e175c00c62dca3d91b987015808b5d52e8db2b4
    Added Reference https://git.kernel.org/stable/c/73255d702c7560185fd5951aadcf7eb057c2f453
    Added Reference https://git.kernel.org/stable/c/9103078c7b3091a2fbb52af176f95982ee7dd7f8
    Added Reference https://git.kernel.org/stable/c/a0106b41f9a724868d390b8b3b4ea5ca0e04ea53
    Added Reference https://git.kernel.org/stable/c/a0ef2fc89d28ca62923376c4b8ffaa57136a36be
    Added Reference https://git.kernel.org/stable/c/a9029dd55696c651ee46912afa2a166fa456bb3e
    Added Reference https://git.kernel.org/stable/c/cd4524ff6567fa4458a5bec4b017105e671d393e
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CVSS
Vulnerability Scoring Details
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