CVE-2025-38571
HighCVSS 8.2Exploitation Probability (EPSS)
Low risk25th percentile - higher than 25% of all known CVEs
Summary
In the Linux kernel sunrpc module (NFS over TLS), a vulnerability exists in TLS alert handling. The tls_alert_recv function assumes valid data in the msghdr iterator's kvec, which can be exploited. A rework of control message setup and usage via sock_recvmsg() is proposed.
Risk Assessment
The vulnerability could allow an attacker to remotely exploit the TLS handling flaw, leading to information disclosure or NFS service disruption.
Recommendation
Apply the Linux kernel patch that reworks TLS control message handling, including reverting the iterator before calling tls_alert_recv.
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Original NVD description (English source)
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.