CVE-2026-64373 (GCVE-0-2026-64373)

Vulnerability from cvelistv5 – Published: 2026-07-25 08:50 – Updated: 2026-07-25 08:50
VLAI
Title
cpufreq: Fix hotplug-suspend race during reboot
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 ]
Severity
No CVSS data available.
Assigner
Impacted products
Vendor Product Version
Linux Linux Affected: 65650b35133ff20f0c9ef0abd5c3c66dbce3ae57 , < 6d5dd354c37abaf4d60400c55c71f23ba2b33639 (git)
Affected: 65650b35133ff20f0c9ef0abd5c3c66dbce3ae57 , < 9103078c7b3091a2fbb52af176f95982ee7dd7f8 (git)
Affected: 65650b35133ff20f0c9ef0abd5c3c66dbce3ae57 , < cd4524ff6567fa4458a5bec4b017105e671d393e (git)
Affected: 65650b35133ff20f0c9ef0abd5c3c66dbce3ae57 , < 73255d702c7560185fd5951aadcf7eb057c2f453 (git)
Affected: 65650b35133ff20f0c9ef0abd5c3c66dbce3ae57 , < a0ef2fc89d28ca62923376c4b8ffaa57136a36be (git)
Affected: 65650b35133ff20f0c9ef0abd5c3c66dbce3ae57 , < 6e175c00c62dca3d91b987015808b5d52e8db2b4 (git)
Affected: 65650b35133ff20f0c9ef0abd5c3c66dbce3ae57 , < a0106b41f9a724868d390b8b3b4ea5ca0e04ea53 (git)
Affected: 65650b35133ff20f0c9ef0abd5c3c66dbce3ae57 , < a9029dd55696c651ee46912afa2a166fa456bb3e (git)
Affected: 8bfa06ea6e81bf08d2132d7e70c2b5313b34caf8 (git)
Affected: 7ccf3b8b7a12dc9da158c2e699c36d04b2496944 (git)
Affected: 5f466713989250938624afa79dc33bae20920700 (git)
Affected: 89ab39da1452d272007acc5912d4008047b86706 (git)
Affected: cb4b4601f910c78d2b49f637a12ef98b41cb76a9 (git)
Affected: 4.4.198 , < 4.5 (semver)
Affected: 4.9.198 , < 4.10 (semver)
Affected: 4.14.151 , < 4.15 (semver)
Affected: 4.19.81 , < 4.20 (semver)
Affected: 5.3.8 , < 5.4 (semver)
Create a notification for this product.
Linux Linux Affected: 5.4
Unaffected: 0 , < 5.4 (semver)
Unaffected: 5.10.261 , ≤ 5.10.* (semver)
Unaffected: 5.15.212 , ≤ 5.15.* (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.96 , ≤ 6.12.* (semver)
Unaffected: 6.18.39 , ≤ 6.18.* (semver)
Unaffected: 7.1.4 , ≤ 7.1.* (semver)
Unaffected: 7.2-rc1 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website

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          "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 ]"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2026-64373\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-07-25T10:17:20.283\",\"lastModified\":\"2026-07-25T10:17:20.283\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"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 ]\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/cpufreq/cpufreq.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"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\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/cpufreq/cpufreq.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.4\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.4\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.261\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.212\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.178\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.145\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.96\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.39\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.4\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2-rc1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/6d5dd354c37abaf4d60400c55c71f23ba2b33639\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6e175c00c62dca3d91b987015808b5d52e8db2b4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/73255d702c7560185fd5951aadcf7eb057c2f453\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9103078c7b3091a2fbb52af176f95982ee7dd7f8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a0106b41f9a724868d390b8b3b4ea5ca0e04ea53\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a0ef2fc89d28ca62923376c4b8ffaa57136a36be\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a9029dd55696c651ee46912afa2a166fa456bb3e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cd4524ff6567fa4458a5bec4b017105e671d393e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "suse_vex": {
      "aggregate_severity": "not set",
      "current_release_date": "2026-07-25T16:00:43Z",
      "cve": "CVE-2026-64373",
      "id": "CVE-2026-64373",
      "initial_release_date": "2026-07-25T16:00:43Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64373",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64373.json",
      "version": "2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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Detection rules are retrieved from Rulezet.

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