CVE-2026-43215 Linux内核CIFS锁定机制漏洞

/* * Conceptual PoC demonstrating the locking issue. * This code simulates the incorrect locking usage that leads to race conditions. */ // Incorrect usage (Vulnerable path) // spin_lock(&cifs_tcp_ses_lock); // access_tcon_field(tcon); // spin_unlock(&cifs_tcp_ses_lock); // Correct usage (Patched path) // spin_lock(&tcon->tc_lock); // access_tcon_field(tcon); // spin_unlock(&tcon->tc_lock); // Triggering the race requires concurrent CIFS operations. // Example: Multi-threaded mount/unmount or file IO on a malicious SMB share.