CVE-2025-38571

In the Linux kernel, the following vulnerability has been resolved:

sunrpc: fix client side handling of tls alerts

A security exploit was discovered in NFS over TLS in tls_alert_recv

due to its assumption that there is valid data in the msghdr's

iterator's kvec.

Instead, this patch proposes the rework how control messages are

setup and used by sock_recvmsg().

If no control message structure is setup, kTLS layer will read and

process TLS data record types. As soon as it encounters a TLS control

message, it would return an error. At that point, NFS can setup a kvec

backed control buffer and read in the control message such as a TLS

alert. Scott found that a msg iterator can advance the kvec pointer

as a part of the copy process thus we need to revert the iterator

before calling into the tls_alert_recv.