sunrpc: fix handling of server side tls alerts
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.
CVE-2025-38566
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2025-38566
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5e052dda121e2870dd87181783da4a95d7d2927b",
"lessThan": "b1df394621710b312f0393e3f240fdac0764f968",
"versionType": "git"
},
{
"status": "affected",
"version": "5e052dda121e2870dd87181783da4a95d7d2927b",
"lessThan": "25bb3647d30a20486b5fe7cff2b0e503c16c9692",
"versionType": "git"
},
{
"status": "affected",
"version": "5e052dda121e2870dd87181783da4a95d7d2927b",
"lessThan": "3b549da875414989f480b66835d514be80a0bd9c",
"versionType": "git"
},
{
"status": "affected",
"version": "5e052dda121e2870dd87181783da4a95d7d2927b",
"lessThan": "6b33c31cc788073bfbed9297e1f4486ed73d87da",
"versionType": "git"
},
{
"status": "affected",
"version": "5e052dda121e2870dd87181783da4a95d7d2927b",
"lessThan": "bee47cb026e762841f3faece47b51f985e215edb",
"versionType": "git"
}
],
"programFiles": [
"net/sunrpc/svcsock.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.4"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.4",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.102",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.42",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.15.10",
"versionType": "semver",
"lessThanOrEqual": "6.15.*"
},
{
"status": "unaffected",
"version": "6.16.1",
"versionType": "semver",
"lessThanOrEqual": "6.16.*"
},
{
"status": "unaffected",
"version": "6.17",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/sunrpc/svcsock.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2025-38566
Source reference:
/cveMetadata/cveId
Publisher severity
critical
Source reference: /containers/cna/metrics
- Event
- #30593 · Revision 1
- Added to Heist Feed
- Publisher date