CVE-2026-64373 (GCVE-0-2026-64373)
Vulnerability from cvelistv5
Published
2026-07-25 08:50
Modified
2026-08-17 04:54
Severity ?
VLAI Severity ?
EPSS score ?
Summary
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 ]
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: 65650b35133ff20f0c9ef0abd5c3c66dbce3ae57 Version: 65650b35133ff20f0c9ef0abd5c3c66dbce3ae57 Version: 65650b35133ff20f0c9ef0abd5c3c66dbce3ae57 Version: 65650b35133ff20f0c9ef0abd5c3c66dbce3ae57 Version: 65650b35133ff20f0c9ef0abd5c3c66dbce3ae57 Version: 65650b35133ff20f0c9ef0abd5c3c66dbce3ae57 Version: 65650b35133ff20f0c9ef0abd5c3c66dbce3ae57 Version: 65650b35133ff20f0c9ef0abd5c3c66dbce3ae57 Version: 8bfa06ea6e81bf08d2132d7e70c2b5313b34caf8 Version: 7ccf3b8b7a12dc9da158c2e699c36d04b2496944 Version: 5f466713989250938624afa79dc33bae20920700 Version: 89ab39da1452d272007acc5912d4008047b86706 Version: cb4b4601f910c78d2b49f637a12ef98b41cb76a9 Version: 4.4.198 ≤ Version: 4.9.198 ≤ Version: 4.14.151 ≤ Version: 4.19.81 ≤ Version: 5.3.8 ≤ |
||
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"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncpufreq: Fix hotplug-suspend race during reboot\n\nDuring system reboot, cpufreq_suspend() is called via the\nkernel_restart() -\u003e device_shutdown() path. Unlike the normal system\nsuspend path, the reboot path does not call freeze_processes(), so\nuserspace processes and kernel threads remain active.\n\nThis allows CPU hotplug operations to run concurrently with\ncpufreq_suspend(). The original code has no synchronization with CPU\nhotplug, leading to a race condition where governor_data can be freed\nby the hotplug path while cpufreq_suspend() is still accessing it,\nresulting in a null pointer dereference:\n\n Unable to handle kernel NULL pointer dereference\n Call Trace:\n do_kernel_fault+0x28/0x3c\n cpufreq_suspend+0xdc/0x160\n device_shutdown+0x18/0x200\n kernel_restart+0x40/0x80\n arm64_sys_reboot+0x1b0/0x200\n\nFix this by adding cpus_read_lock()/cpus_read_unlock() to\ncpufreq_suspend() to block CPU hotplug operations while suspend is in\nprogress.\n\n[ rjw: Changelog edits ]"
}
],
"providerMetadata": {
"dateUpdated": "2026-08-17T04:54:23.307Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
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"url": "https://git.kernel.org/stable/c/6d5dd354c37abaf4d60400c55c71f23ba2b33639"
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{
"url": "https://git.kernel.org/stable/c/9103078c7b3091a2fbb52af176f95982ee7dd7f8"
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{
"url": "https://git.kernel.org/stable/c/cd4524ff6567fa4458a5bec4b017105e671d393e"
},
{
"url": "https://git.kernel.org/stable/c/73255d702c7560185fd5951aadcf7eb057c2f453"
},
{
"url": "https://git.kernel.org/stable/c/a0ef2fc89d28ca62923376c4b8ffaa57136a36be"
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"url": "https://git.kernel.org/stable/c/a0106b41f9a724868d390b8b3b4ea5ca0e04ea53"
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{
"url": "https://git.kernel.org/stable/c/a9029dd55696c651ee46912afa2a166fa456bb3e"
}
],
"title": "cpufreq: Fix hotplug-suspend race during reboot",
"x_generator": {
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"cveMetadata": {
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"assignerShortName": "Linux",
"cveId": "CVE-2026-64373",
"datePublished": "2026-07-25T08:50:25.427Z",
"dateReserved": "2026-07-19T15:36:31.784Z",
"dateUpdated": "2026-08-17T04:54:23.307Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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