CVE-2026-80586mptcp: options: reset DSS fields in case of unexpected size
- 9.8CriticalCVSS base score
- 0.40%Exploitation in 30 daysEPSS · top 65% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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.
Timeline
ID reserved
By Linux
Published
- 51 days later
· 51 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | Critical9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Received | 3.1 | Critical9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.40% · top 65% of all CVEs (14 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.8.
Affected products
- affected 648ef4b88673dadb8463bf0d4b10fbf33d55def8 – < 15e35fdad7a5576bf3f1c8d688877aeb5d1b506b
- affected 648ef4b88673dadb8463bf0d4b10fbf33d55def8 – < b1256090816ec46011601e084be580731df58fc7
- affected 648ef4b88673dadb8463bf0d4b10fbf33d55def8 – < 192878df582c51d440bf7b91a15f297f29f2b596
- affected 648ef4b88673dadb8463bf0d4b10fbf33d55def8 – < 26dac5c9ffb20812b475fdf253eb04fab99cff3b
- affected 648ef4b88673dadb8463bf0d4b10fbf33d55def8 – < 4e80eff5c1c893aca2ac1d202f0b256d2e52ecde
- affected 648ef4b88673dadb8463bf0d4b10fbf33d55def8 – < 1fade1b2ac5b1a4948e538fae7313bea57b5ac36
- affected 648ef4b88673dadb8463bf0d4b10fbf33d55def8 – < 27ed642a4e7e4b5df4b8522c72c457a67e052493
- affected 648ef4b88673dadb8463bf0d4b10fbf33d55def8 – < 35772b4981f38ba8059372cde8753e8e477e98ec
- affected 5.6
- unaffected < 5.6
- unaffected 5.10.266 – ≤ 5.10.*
- unaffected 5.15.217 – ≤ 5.15.*
- unaffected 6.1.184 – ≤ 6.1.*
- unaffected 6.6.153 – ≤ 6.6.*
- unaffected 6.12.105 – ≤ 6.12.*
- unaffected 6.18.46 – ≤ 6.18.*
- unaffected 7.1.10 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References
References8
- https://git.kernel.org/stable/c/15e35fdad7a5576bf3f1c8d688877aeb5d1b506b (opens in a new tab)
- https://git.kernel.org/stable/c/b1256090816ec46011601e084be580731df58fc7 (opens in a new tab)
- https://git.kernel.org/stable/c/192878df582c51d440bf7b91a15f297f29f2b596 (opens in a new tab)
- https://git.kernel.org/stable/c/26dac5c9ffb20812b475fdf253eb04fab99cff3b (opens in a new tab)
- https://git.kernel.org/stable/c/4e80eff5c1c893aca2ac1d202f0b256d2e52ecde (opens in a new tab)
- https://git.kernel.org/stable/c/1fade1b2ac5b1a4948e538fae7313bea57b5ac36 (opens in a new tab)
- https://git.kernel.org/stable/c/27ed642a4e7e4b5df4b8522c72c457a67e052493 (opens in a new tab)
- https://git.kernel.org/stable/c/35772b4981f38ba8059372cde8753e8e477e98ec (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-66501 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-80586)Record last updated .