Answer in brief
CVE-2026-80586 records a Unknown severity vulnerability in mptcp: options: reset DSS fields in case of unexpected size. 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.
A CVSS score is not reported in the current record. 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.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=648ef4b88673dadb8463bf0d4b10fbf33d55def8 <15e35fdad7a5576bf3f1c8d688877aeb5d1b506b || >=648ef4b88673dadb8463bf0d4b10fbf33d55def8 <b1256090816ec46011601e084be580731df58fc7 || >=648ef4b88673dadb8463bf0d4b10fbf33d55def8 <192878df582c51d440bf7b91a15f297f29f2b596 || >=648ef4b88673dadb8463bf0d4b10fbf33d55def8 <26dac5c9ffb20812b475fdf253eb04fab99cff3b || >=648ef4b88673dadb8463bf0d4b10fbf33d55def8 <4e80eff5c1c893aca2ac1d202f0b256d2e52ecde || >=648ef4b88673dadb8463bf0d4b10fbf33d55def8 <1fade1b2ac5b1a4948e538fae7313bea57b5ac36 || >=648ef4b88673dadb8463bf0d4b10fbf33d55def8 <27ed642a4e7e4b5df4b8522c72c457a67e052493 || >=648ef4b88673dadb8463bf0d4b10fbf33d55def8 <35772b4981f38ba8059372cde8753e8e477e98ec | 15e35fdad7a5576bf3f1c8d688877aeb5d1b506b, b1256090816ec46011601e084be580731df58fc7, 192878df582c51d440bf7b91a15f297f29f2b596, 26dac5c9ffb20812b475fdf253eb04fab99cff3b, 4e80eff5c1c893aca2ac1d202f0b256d2e52ecde, 1fade1b2ac5b1a4948e538fae7313bea57b5ac36, 27ed642a4e7e4b5df4b8522c72c457a67e052493, 35772b4981f38ba8059372cde8753e8e477e98ec |
| Linux/Linuxgeneric | 5.6 | Not reported |
Published upstream
Aug 26, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 26, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 26, 2026
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.
Quoted source text, attributed separately from HOL analysis.