DEBIAN-CVE-2026-89536

In the Linux kernel, the following vulnerability has been resolved:  SUNRPC: wait for in-flight client TLS handshake callback  xstlshandshakesync() gives xstlshandshakedone() a reference to the lower transport before submitting the handshake request. On timeout or signal, the synchronous waiter drops that reference after calling tlshandshakecancel().  handshakereqcancel() returns false when handshakecomplete() has already marked the request complete. In that case the completion callback can still be running, so dropping the callback-owned reference in the waiter can free the lower transport before xstlshandshakedone() stores xprterr or drops its own reference.  If cancellation loses to completion, wait until xstlshandshakedone() signals handshake_done and let the callback release its reference. This mirrors the server-side handshake lifetime handling and keeps the timeout or signal return value unchanged.