CVE-2025-38571: 
Linux Kernel vulnerability analysis and mitigation

CVE-2025-38571 is a security vulnerability discovered in the Linux kernel, specifically affecting the sunrpc (Remote Procedure Call) subsystem's client-side handling of TLS alerts. The vulnerability was disclosed on August 19, 2025, and affects the Linux kernel's NFS over TLS implementation (NVD Database).

The vulnerability exists in the tlsalertrecv function due to an incorrect assumption about valid data presence in the msghdr's iterator's kvec. The issue stems from how control messages are handled by sockrecvmsg(). When no control message structure is set up, the kTLS layer processes TLS data record types, but encounters errors when processing TLS control messages. Additionally, the msg iterator can advance the kvec pointer during the copy process, requiring the iterator to be reverted before calling tlsalert_recv (NVD Database).

The vulnerability affects the Linux kernel's NFS over TLS implementation, potentially impacting secure network file system operations. However, specific impact details and severity scores have not yet been assigned by the NVD (NVD Database).

A patch has been developed to address this vulnerability by reworking how control messages are set up and used by sock_recvmsg(). The fix involves implementing proper handling of TLS control messages and ensuring correct management of the kvec pointer during message processing (NVD Database).