CVE-2025-38566sunrpc: fix handling of server side tls alerts
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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
- 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 15, 2026
Affected products
Linux Linux linux:linux (from the name) | from 5e052dda121e2870dd87181783da4a95d7d2927b before b1df394621710b312f0393e3f240fdac0764f968; from 5e052dda121e2870dd87181783da4a95d7d2927b before 25bb3647d30a20486b5fe7cff2b0e503c16c9692; 5e052dda121e2870dd87181783da4a95d7d2927b builds before 3b549da875414989f480b66835d514be80a0bd9c; from 5e052dda121e2870dd87181783da4a95d7d2927b before 6b33c31cc788073bfbed9297e1f4486ed73d87da; from 5e052dda121e2870dd87181783da4a95d7d2927b before bee47cb026e762841f3faece47b51f985e215edb | CNA record |
linux linux_kernel linux:linux_kernel | from 6.4 before 6.6.102; from 6.7 before 6.12.42; from 6.13 before 6.15.10; from 6.16 before 6.16.1; 6.17 | NVD |
References
- https://git.kernel.org/stable/c/b1df394621710b312f0393e3f240fdac0764f968patch
- https://git.kernel.org/stable/c/25bb3647d30a20486b5fe7cff2b0e503c16c9692patch
- https://git.kernel.org/stable/c/3b549da875414989f480b66835d514be80a0bd9cpatch
- https://git.kernel.org/stable/c/6b33c31cc788073bfbed9297e1f4486ed73d87dapatch
- https://git.kernel.org/stable/c/bee47cb026e762841f3faece47b51f985e215edbpatch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.