Description (CNA)
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 ]
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 65650b35133ff20f0c9ef0abd5c3c66dbce3ae57 before 6d5dd354c37abaf4d60400c55c71f23ba2b33639; affected 65650b35133ff20f0c9ef0abd5c3c66dbce3ae57 before 9103078c7b3091a2fbb52af176f95982ee7dd7f8; affected 65650b35133ff20f0c9ef0abd5c3c66dbce3ae57 before cd4524ff6567fa4458a5bec4b017105e671d393e; affected 65650b35133ff20f0c9ef0abd5c3c66dbce3ae57 before 73255d702c7560185fd5951aadcf7eb057c2f453; affected 65650b35133ff20f0c9ef0abd5c3c66dbce3ae57 before a0ef2fc89d28ca62923376c4b8ffaa57136a36be; affected 65650b35133ff20f0c9ef0abd5c3c66dbce3ae57 before 6e175c00c62dca3d91b987015808b5d52e8db2b4; affected 65650b35133ff20f0c9ef0abd5c3c66dbce3ae57 before a0106b41f9a724868d390b8b3b4ea5ca0e04ea53; affected 65650b35133ff20f0c9ef0abd5c3c66dbce3ae57 before a9029dd55696c651ee46912afa2a166fa456bb3e; affected 8bfa06ea6e81bf08d2132d7e70c2b5313b34caf8; affected 7ccf3b8b7a12dc9da158c2e699c36d04b2496944; affected 5f466713989250938624afa79dc33bae20920700; affected 89ab39da1452d272007acc5912d4008047b86706; affected cb4b4601f910c78d2b49f637a12ef98b41cb76a9; affected 4.4.198 before 4.5; affected 4.9.198 before 4.10; affected 4.14.151 before 4.15; affected 4.19.81 before 4.20; affected 5.3.8 before 5.4 |
| Linux / Linux | affected 5.4; unaffected 0 before 5.4; unaffected 5.10.261 through 5.10.*; unaffected 5.15.212 through 5.15.*; unaffected 6.1.178 through 6.1.*; unaffected 6.6.145 through 6.6.*; unaffected 6.12.96 through 6.12.*; unaffected 6.18.39 through 6.18.*; unaffected 7.1.4 through 7.1.*; unaffected 7.2 through * |
CWE
No CWE identifiers supplied.
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