CVE-2025-38566

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

sunrpc: fix handling of server side tls alerts

Scott Mayhew discovered a security exploit in NFS over TLS in

tls_alert_recv() due to its assumption it can read data from

the msg iterator's kvec..

kTLS implementation splits TLS non-data record payload between

the control message buffer (which includes the type such as TLS

aler or TLS cipher change) and the rest of the payload (say TLS

alert's level/description) which goes into the msg payload buffer.

This patch proposes to 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 msg buffer and read in the control message such as a

TLS alert. 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.