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

Vulnerability from cvelistv5 – Published: 2026-07-25 08:50 – Updated: 2026-11-06 16:44
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.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-06 16:37 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6653 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
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)
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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 , ≤ * (original_commit_for_fix)
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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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      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-64373.json",
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          "references": [
            {
              "url": "https://git.kernel.org/stable/c/6d5dd354c37abaf4d60400c55c71f23ba2b33639"
            },
            {
              "url": "https://git.kernel.org/stable/c/9103078c7b3091a2fbb52af176f95982ee7dd7f8"
            },
            {
              "url": "https://git.kernel.org/stable/c/cd4524ff6567fa4458a5bec4b017105e671d393e"
            },
            {
              "url": "https://git.kernel.org/stable/c/73255d702c7560185fd5951aadcf7eb057c2f453"
            },
            {
              "url": "https://git.kernel.org/stable/c/a0ef2fc89d28ca62923376c4b8ffaa57136a36be"
            },
            {
              "url": "https://git.kernel.org/stable/c/6e175c00c62dca3d91b987015808b5d52e8db2b4"
            },
            {
              "url": "https://git.kernel.org/stable/c/a0106b41f9a724868d390b8b3b4ea5ca0e04ea53"
            },
            {
              "url": "https://git.kernel.org/stable/c/a9029dd55696c651ee46912afa2a166fa456bb3e"
            }
          ],
          "title": "cpufreq: Fix hotplug-suspend race during reboot",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2026-64373",
        "datePublished": "2026-07-25T08:50:25.427Z",
        "dateReserved": "2026-07-19T15:36:31.784Z",
        "dateUpdated": "2026-11-06T16:44:50.158Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Tags
Taxonomy of the tags.




Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

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.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.