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 ]
Metrics
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:HWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= 65650b35133ff20f0c9ef0abd5c3c66dbce3ae57, < 6d5dd354c37abaf4d60400c55c71f23ba2b33639; >= 65650b35133ff20f0c9ef0abd5c3c66dbce3ae57, < 9103078c7b3091a2fbb52af176f95982ee7dd7f8; >= 65650b35133ff20f0c9ef0abd5c3c66dbce3ae57, < cd4524ff6567fa4458a5bec4b017105e671d393e; >= 65650b35133ff20f0c9ef0abd5c3c66dbce3ae57, < 73255d702c7560185fd5951aadcf7eb057c2f453; >= 65650b35133ff20f0c9ef0abd5c3c66dbce3ae57, < a0ef2fc89d28ca62923376c4b8ffaa57136a36be; >= 65650b35133ff20f0c9ef0abd5c3c66dbce3ae57, < 6e175c00c62dca3d91b987015808b5d52e8db2b4; >= 65650b35133ff20f0c9ef0abd5c3c66dbce3ae57, < a0106b41f9a724868d390b8b3b4ea5ca0e04ea53; >= 65650b35133ff20f0c9ef0abd5c3c66dbce3ae57, < a9029dd55696c651ee46912afa2a166fa456bb3e; 8bfa06ea6e81bf08d2132d7e70c2b5313b34caf8; 7ccf3b8b7a12dc9da158c2e699c36d04b2496944; 5f466713989250938624afa79dc33bae20920700; 89ab39da1452d272007acc5912d4008047b86706; cb4b4601f910c78d2b49f637a12ef98b41cb76a9; >= 4.4.198, < 4.5; >= 4.9.198, < 4.10; >= 4.14.151, < 4.15; >= 4.19.81, < 4.20; >= 5.3.8, < 5.4 |
| Linux | Linux | 5.4 |
References
- https://git.kernel.org/stable/c/6d5dd354c37abaf4d60400c55c71f23ba2b33639Patch
- https://git.kernel.org/stable/c/6e175c00c62dca3d91b987015808b5d52e8db2b4Patch
- https://git.kernel.org/stable/c/73255d702c7560185fd5951aadcf7eb057c2f453Patch
- https://git.kernel.org/stable/c/9103078c7b3091a2fbb52af176f95982ee7dd7f8Patch
- https://git.kernel.org/stable/c/a0106b41f9a724868d390b8b3b4ea5ca0e04ea53Patch
- https://git.kernel.org/stable/c/a0ef2fc89d28ca62923376c4b8ffaa57136a36bePatch
- https://git.kernel.org/stable/c/a9029dd55696c651ee46912afa2a166fa456bb3ePatch
- https://git.kernel.org/stable/c/cd4524ff6567fa4458a5bec4b017105e671d393ePatch
Timeline
- Published
- Jul 25, 2026
- Last modified
- Nov 6, 2026
- NVD status
- Analyzed