Answer in brief
CVE-2025-38566 records a Critical severity (CVSS 9.8) vulnerability in sunrpc: fix handling of server side tls alerts. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 9.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:6.17:rc1:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=5e052dda121e2870dd87181783da4a95d7d2927b <b1df394621710b312f0393e3f240fdac0764f968 || >=5e052dda121e2870dd87181783da4a95d7d2927b <25bb3647d30a20486b5fe7cff2b0e503c16c9692 || >=5e052dda121e2870dd87181783da4a95d7d2927b <3b549da875414989f480b66835d514be80a0bd9c || >=5e052dda121e2870dd87181783da4a95d7d2927b <6b33c31cc788073bfbed9297e1f4486ed73d87da || >=5e052dda121e2870dd87181783da4a95d7d2927b <bee47cb026e762841f3faece47b51f985e215edb | b1df394621710b312f0393e3f240fdac0764f968, 25bb3647d30a20486b5fe7cff2b0e503c16c9692, 3b549da875414989f480b66835d514be80a0bd9c, 6b33c31cc788073bfbed9297e1f4486ed73d87da, bee47cb026e762841f3faece47b51f985e215edb |
| Linux/Linuxgeneric | 6.4 | Not reported |
Published upstream
Aug 19, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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.
Quoted source text, attributed separately from HOL analysis.