CVE-2026-80586mptcp: options: reset DSS fields in case of unexpected size
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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: 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.
- 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
- Received
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | 648ef4b88673dadb8463bf0d4b10fbf33d55def8 builds before 15e35fdad7a5576bf3f1c8d688877aeb5d1b506b; from 648ef4b88673dadb8463bf0d4b10fbf33d55def8 before b1256090816ec46011601e084be580731df58fc7; from 648ef4b88673dadb8463bf0d4b10fbf33d55def8 before 192878df582c51d440bf7b91a15f297f29f2b596; 648ef4b88673dadb8463bf0d4b10fbf33d55def8 builds before 26dac5c9ffb20812b475fdf253eb04fab99cff3b; 648ef4b88673dadb8463bf0d4b10fbf33d55def8 builds before 4e80eff5c1c893aca2ac1d202f0b256d2e52ecde; 648ef4b88673dadb8463bf0d4b10fbf33d55def8 builds before 1fade1b2ac5b1a4948e538fae7313bea57b5ac36; 648ef4b88673dadb8463bf0d4b10fbf33d55def8 builds before 27ed642a4e7e4b5df4b8522c72c457a67e052493; from 648ef4b88673dadb8463bf0d4b10fbf33d55def8 before 35772b4981f38ba8059372cde8753e8e477e98ec | CNA record |
References
- https://git.kernel.org/stable/c/15e35fdad7a5576bf3f1c8d688877aeb5d1b506b
- https://git.kernel.org/stable/c/b1256090816ec46011601e084be580731df58fc7
- https://git.kernel.org/stable/c/192878df582c51d440bf7b91a15f297f29f2b596
- https://git.kernel.org/stable/c/26dac5c9ffb20812b475fdf253eb04fab99cff3b
- https://git.kernel.org/stable/c/4e80eff5c1c893aca2ac1d202f0b256d2e52ecde
- https://git.kernel.org/stable/c/1fade1b2ac5b1a4948e538fae7313bea57b5ac36
- https://git.kernel.org/stable/c/27ed642a4e7e4b5df4b8522c72c457a67e052493
- https://git.kernel.org/stable/c/35772b4981f38ba8059372cde8753e8e477e98ec
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.