{"id":"CVE-2026-64373","state":"PUBLISHED","title":"cpufreq: Fix hotplug-suspend race during reboot","description":"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() -> 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 ]","publishedAt":"2026-07-25T08:50:25.427Z","updatedAt":"2026-08-17T04:54:23.307Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"65650b35133ff20f0c9ef0abd5c3c66dbce3ae57","status":"affected","lessThan":"6d5dd354c37abaf4d60400c55c71f23ba2b33639","versionType":"git"},{"version":"65650b35133ff20f0c9ef0abd5c3c66dbce3ae57","status":"affected","lessThan":"9103078c7b3091a2fbb52af176f95982ee7dd7f8","versionType":"git"},{"version":"65650b35133ff20f0c9ef0abd5c3c66dbce3ae57","status":"affected","lessThan":"cd4524ff6567fa4458a5bec4b017105e671d393e","versionType":"git"},{"version":"65650b35133ff20f0c9ef0abd5c3c66dbce3ae57","status":"affected","lessThan":"73255d702c7560185fd5951aadcf7eb057c2f453","versionType":"git"},{"version":"65650b35133ff20f0c9ef0abd5c3c66dbce3ae57","status":"affected","lessThan":"a0ef2fc89d28ca62923376c4b8ffaa57136a36be","versionType":"git"},{"version":"65650b35133ff20f0c9ef0abd5c3c66dbce3ae57","status":"affected","lessThan":"6e175c00c62dca3d91b987015808b5d52e8db2b4","versionType":"git"},{"version":"65650b35133ff20f0c9ef0abd5c3c66dbce3ae57","status":"affected","lessThan":"a0106b41f9a724868d390b8b3b4ea5ca0e04ea53","versionType":"git"},{"version":"65650b35133ff20f0c9ef0abd5c3c66dbce3ae57","status":"affected","lessThan":"a9029dd55696c651ee46912afa2a166fa456bb3e","versionType":"git"},{"version":"8bfa06ea6e81bf08d2132d7e70c2b5313b34caf8","status":"affected","versionType":"git"},{"version":"7ccf3b8b7a12dc9da158c2e699c36d04b2496944","status":"affected","versionType":"git"},{"version":"5f466713989250938624afa79dc33bae20920700","status":"affected","versionType":"git"},{"version":"89ab39da1452d272007acc5912d4008047b86706","status":"affected","versionType":"git"},{"version":"cb4b4601f910c78d2b49f637a12ef98b41cb76a9","status":"affected","versionType":"git"},{"version":"4.4.198","status":"affected","lessThan":"4.5","versionType":"semver"},{"version":"4.9.198","status":"affected","lessThan":"4.10","versionType":"semver"},{"version":"4.14.151","status":"affected","lessThan":"4.15","versionType":"semver"},{"version":"4.19.81","status":"affected","lessThan":"4.20","versionType":"semver"},{"version":"5.3.8","status":"affected","lessThan":"5.4","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/cpufreq/cpufreq.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.4","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.4","versionType":"semver"},{"version":"5.10.261","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.212","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.178","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.145","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.96","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.39","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.4","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/cpufreq/cpufreq.c"]}],"references":["https://git.kernel.org/stable/c/6d5dd354c37abaf4d60400c55c71f23ba2b33639","https://git.kernel.org/stable/c/9103078c7b3091a2fbb52af176f95982ee7dd7f8","https://git.kernel.org/stable/c/cd4524ff6567fa4458a5bec4b017105e671d393e","https://git.kernel.org/stable/c/73255d702c7560185fd5951aadcf7eb057c2f453","https://git.kernel.org/stable/c/a0ef2fc89d28ca62923376c4b8ffaa57136a36be","https://git.kernel.org/stable/c/6e175c00c62dca3d91b987015808b5d52e8db2b4","https://git.kernel.org/stable/c/a0106b41f9a724868d390b8b3b4ea5ca0e04ea53","https://git.kernel.org/stable/c/a9029dd55696c651ee46912afa2a166fa456bb3e"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:41.951Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/64xxx/CVE-2026-64373.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-64373","state":"PUBLISHED","datePublished":"2026-07-25T08:50:25.427Z","dateUpdated":"2026-08-17T04:54:23.307Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-07-19T15:36:31.784Z"},"containers":{"cna":{"title":"cpufreq: Fix hotplug-suspend race during reboot","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() -> 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":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"65650b35133ff20f0c9ef0abd5c3c66dbce3ae57","status":"affected","lessThan":"6d5dd354c37abaf4d60400c55c71f23ba2b33639","versionType":"git"},{"version":"65650b35133ff20f0c9ef0abd5c3c66dbce3ae57","status":"affected","lessThan":"9103078c7b3091a2fbb52af176f95982ee7dd7f8","versionType":"git"},{"version":"65650b35133ff20f0c9ef0abd5c3c66dbce3ae57","status":"affected","lessThan":"cd4524ff6567fa4458a5bec4b017105e671d393e","versionType":"git"},{"version":"65650b35133ff20f0c9ef0abd5c3c66dbce3ae57","status":"affected","lessThan":"73255d702c7560185fd5951aadcf7eb057c2f453","versionType":"git"},{"version":"65650b35133ff20f0c9ef0abd5c3c66dbce3ae57","status":"affected","lessThan":"a0ef2fc89d28ca62923376c4b8ffaa57136a36be","versionType":"git"},{"version":"65650b35133ff20f0c9ef0abd5c3c66dbce3ae57","status":"affected","lessThan":"6e175c00c62dca3d91b987015808b5d52e8db2b4","versionType":"git"},{"version":"65650b35133ff20f0c9ef0abd5c3c66dbce3ae57","status":"affected","lessThan":"a0106b41f9a724868d390b8b3b4ea5ca0e04ea53","versionType":"git"},{"version":"65650b35133ff20f0c9ef0abd5c3c66dbce3ae57","status":"affected","lessThan":"a9029dd55696c651ee46912afa2a166fa456bb3e","versionType":"git"},{"version":"8bfa06ea6e81bf08d2132d7e70c2b5313b34caf8","status":"affected","versionType":"git"},{"version":"7ccf3b8b7a12dc9da158c2e699c36d04b2496944","status":"affected","versionType":"git"},{"version":"5f466713989250938624afa79dc33bae20920700","status":"affected","versionType":"git"},{"version":"89ab39da1452d272007acc5912d4008047b86706","status":"affected","versionType":"git"},{"version":"cb4b4601f910c78d2b49f637a12ef98b41cb76a9","status":"affected","versionType":"git"},{"version":"4.4.198","status":"affected","lessThan":"4.5","versionType":"semver"},{"version":"4.9.198","status":"affected","lessThan":"4.10","versionType":"semver"},{"version":"4.14.151","status":"affected","lessThan":"4.15","versionType":"semver"},{"version":"4.19.81","status":"affected","lessThan":"4.20","versionType":"semver"},{"version":"5.3.8","status":"affected","lessThan":"5.4","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/cpufreq/cpufreq.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.4","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.4","versionType":"semver"},{"version":"5.10.261","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.212","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.178","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.145","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.96","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.39","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.4","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/cpufreq/cpufreq.c"]}],"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"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-17T04:54:23.307Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4","versionEndExcluding":"5.10.261"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4","versionEndExcluding":"5.15.212"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4","versionEndExcluding":"6.1.178"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4","versionEndExcluding":"6.6.145"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4","versionEndExcluding":"6.12.96"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux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