CVE-2026-89536

Description

In the Linux kernel, the following vulnerability has been resolved: SUNRPC: wait for in-flight client TLS handshake callback xs_tls_handshake_sync() gives xs_tls_handshake_done() a reference to the lower transport before submitting the handshake request. On timeout or signal, the synchronous waiter drops that reference after calling tls_handshake_cancel(). handshake_req_cancel() returns false when handshake_complete() 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 xs_tls_handshake_done() stores xprt_err or drops its own reference. If cancellation loses to completion, wait until xs_tls_handshake_done() 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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

References

• https://git.kernel.org/stable/c/fb43997407bc17ee39bac81ab708101312e255f5 ↗
• https://git.kernel.org/stable/c/15431820f448e09f8029b670d5c82aa5917d4625 ↗
• https://git.kernel.org/stable/c/1de391e8b94e31b45c19c16dbf315e294810c7de ↗
• https://git.kernel.org/stable/c/7fbb6d2ab0391eb8d1f1a68e6bc263ef02cea61b ↗
• https://git.kernel.org/stable/c/a89dd597458848b463d284b15e42a8078beeb046 ↗