mptcp: options: reset DSS fields in case of unexpected size
In the Linux kernel, the following vulnerability has been resolved: mptcp: options: reset DSS fields in case of unexpected size A remote peer could send a malformed DSS with a wrong size, followed by another DSS or MPC + Data. In this case, the first suboption will be ignored, but leaving some fields written, which could lead to inconsistency or access uninitialized data. Explicitly reset the fields that could have been modified in case of unexpected size.
CVE-2026-80586
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-2026-80586
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": "648ef4b88673dadb8463bf0d4b10fbf33d55def8",
"lessThan": "15e35fdad7a5576bf3f1c8d688877aeb5d1b506b",
"versionType": "git"
},
{
"status": "affected",
"version": "648ef4b88673dadb8463bf0d4b10fbf33d55def8",
"lessThan": "b1256090816ec46011601e084be580731df58fc7",
"versionType": "git"
},
{
"status": "affected",
"version": "648ef4b88673dadb8463bf0d4b10fbf33d55def8",
"lessThan": "192878df582c51d440bf7b91a15f297f29f2b596",
"versionType": "git"
},
{
"status": "affected",
"version": "648ef4b88673dadb8463bf0d4b10fbf33d55def8",
"lessThan": "26dac5c9ffb20812b475fdf253eb04fab99cff3b",
"versionType": "git"
},
{
"status": "affected",
"version": "648ef4b88673dadb8463bf0d4b10fbf33d55def8",
"lessThan": "4e80eff5c1c893aca2ac1d202f0b256d2e52ecde",
"versionType": "git"
},
{
"status": "affected",
"version": "648ef4b88673dadb8463bf0d4b10fbf33d55def8",
"lessThan": "1fade1b2ac5b1a4948e538fae7313bea57b5ac36",
"versionType": "git"
},
{
"status": "affected",
"version": "648ef4b88673dadb8463bf0d4b10fbf33d55def8",
"lessThan": "27ed642a4e7e4b5df4b8522c72c457a67e052493",
"versionType": "git"
},
{
"status": "affected",
"version": "648ef4b88673dadb8463bf0d4b10fbf33d55def8",
"lessThan": "35772b4981f38ba8059372cde8753e8e477e98ec",
"versionType": "git"
}
],
"programFiles": [
"net/mptcp/options.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.6"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.6",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.266",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.217",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.184",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.153",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.105",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.46",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.10",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/mptcp/options.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-80586
Source reference:
/cveMetadata/cveId
Publisher severity
critical
Source reference: /containers/cna/metrics
- Event
- #34334 · Revision 1
- Added to Heist Feed
- Publisher date