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Review reviewHigh

CVE-2025-38566

Linux Linux, linux kernel

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 so...

CVSS
7.5
EPSS
0.59%
44.7% percentile
CISA KEV
Not listed
Published
2025.08.20
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.59%
Technical severityCVSS 7.5

Vulnerability overview

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 so...

Affected product and versions

Product
Linux Linux, linux kernel
Affected versions
>= 5e052dda121e2870dd87181783da4a95d7d2927b < b1df394621710b312f0393e3f240fdac0764f968, >= 5e052dda121e2870dd87181783da4a95d7d2927b < 25bb3647d30a20486b5fe7cff2b0e503c16c9692, >= 5e052dda121e2870dd87181783da4a95d7d2927b < 3b549da875414989f480b66835d514be80a0bd9c, >= 5e052dda121e2870dd87181783da4a95d7d2927b < 6b33c31cc788073bfbed9297e1f4486ed73d87da, >= 5e052dda121e2870dd87181783da4a95d7d2927b < bee47cb026e762841f3faece47b51f985e215edb, >= 6.4, >= 6.4 < 6.6.102, >= 6.7 < 6.12.42, >= 6.13 < 6.15.10, >= 6.16 < 6.16.1, 6.17
Fixed versions
6.6.102, 6.12.42, 6.15.10, 6.16.1

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, linux kernel and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
CWE-754