CVE-2025-38566

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Source
https://cve.org/CVERecord?id=CVE-2025-38566
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-38566.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2025-38566
Downstream
Related
Published
2025-08-19T17:02:42.506Z
Modified
2026-03-12T02:16:10.119705Z
Summary
sunrpc: fix handling of server side tls alerts
Details

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 tlsalertrecv() 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 tlsalertrecv.

Database specific 
{
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/38xxx/CVE-2025-38566.json"
}
References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
5e052dda121e2870dd87181783da4a95d7d2927b
Fixed
b1df394621710b312f0393e3f240fdac0764f968
Fixed
25bb3647d30a20486b5fe7cff2b0e503c16c9692
Fixed
3b549da875414989f480b66835d514be80a0bd9c
Fixed
6b33c31cc788073bfbed9297e1f4486ed73d87da
Fixed
bee47cb026e762841f3faece47b51f985e215edb

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-38566.json"