NetBSD contains a use-after-free and double-free vulnerability in msgrecvcopyin() within the COMPATNETBSD32 compatibility layer due to a missing return statement before the cleanup label on the success path. Any local user able to execute a 32-bit binary on a 64-bit NetBSD system can trigger a kernel panic or memory corruption by calling recvmsg() with msgiovlen between 9 and IOVMAX, causing the kernel to access a freed iovec buffer and subsequently free the same allocation a second time.