CVE-2025-38566

Advisory lineage Upstream: 0 Downstream: 96
Analyzed
Published: 19 Aug 2025, 17:02
Last modified:11 May 2026, 21:30

Vulnerability Summary

Overall Risk (default)
medium
30/100
CVSS Score
7.5 HIGH
v3.1 (nvd)
EPSS Score
0.1% LOW
0% probability +0.04%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

19 Aug 2025, 17:02
Published
Vulnerability first disclosed
11 May 2026, 21:30
Last Modified
Vulnerability information updated

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.

CVSS Metrics

  • v3.1•HIGH•Score: 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Trends

Current EPSS score: 0.10%• Percentile: 27%

Techniques & Countermeasures

  • CWE-754•Improper Check for Unusual or Exceptional Conditions

    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.

Affected Systems

  • linux•linux

    ≥ 5e052dda121e2870dd87181783da4a95d7d2927b, < b1df394621710b312f0393e3f240fdac0764f968 | ≥ 5e052dda121e2870dd87181783da4a95d7d2927b, < 25bb3647d30a20486b5fe7cff2b0e503c16c9692 | ≥ 5e052dda121e2870dd87181783da4a95d7d2927b, < 3b549da875414989f480b66835d514be80a0bd9c | ≥ 5e052dda121e2870dd87181783da4a95d7d2927b, < 6b33c31cc788073bfbed9297e1f4486ed73d87da | ≥ 5e052dda121e2870dd87181783da4a95d7d2927b, < bee47cb026e762841f3faece47b51f985e215edb | 6.4

  • linux•linux_kernel

    ≥ 6.4, < 6.6.102 | ≥ 6.7, < 6.12.42 | ≥ 6.13, < 6.15.10 | ≥ 6.16, < 6.16.1 | 6.17:rc1

References (5)