CVE-2026-57842

NetBSD contains a use-after-free and double-free vulnerability in msg recv copyin() within the COMPAT NETBSD32 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 msg iovlen between 9 and IOV MAX, causing the kernel to access a freed iovec buffer and subsequently free the same allocation a second time.