CVE-2025-38566
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-08-19

Last updated on: 2025-11-26

Assigner: kernel.org

Description
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.
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Meta Information
Published
2025-08-19
Last Modified
2025-11-26
Generated
2026-05-27
AI Q&A
2025-08-19
EPSS Evaluated
2026-05-25
NVD
CVE-2025-38566
Affected Vendors & Products
Showing 5 associated CPEs
Vendor Product Version / Range
linux linux_kernel From 5.15.160 (inc) to 5.16 (inc)
linux linux_kernel From 5.15.160 (inc) to 5.16 (inc)
linux linux_kernel From 5.15.160 (inc) to 5.16 (inc)
linux linux_kernel 6.17
linux linux_kernel From 5.15.160 (inc) to 5.16 (inc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-754 The product does not check or incorrectly checks for unusual or exceptional conditions that are not expected to occur frequently during day to day operation of the product.
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?

This vulnerability is in the Linux kernel's handling of server-side TLS alerts in the sunrpc module, specifically in the tls_alert_recv() function. The issue arises because the function incorrectly assumes it can read data from the msg iterator's kvec without properly managing the control message structure. The kTLS implementation splits TLS non-data record payloads between a control message buffer and a message payload buffer. If the control message structure is not properly set up, the kTLS layer may misinterpret TLS control messages, leading to errors. This can cause improper handling of TLS alerts in NFS over TLS communications.


How can this vulnerability impact me? :

This vulnerability can impact you by causing errors in the handling of TLS alerts in NFS over TLS, potentially leading to communication failures or security issues in the network file system operations that rely on TLS. Improper processing of TLS alerts could allow attackers to exploit the system's TLS handling, possibly leading to denial of service or other security risks related to secure communications.


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