Vulnerability 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.
CVSS Score
CRITICAL
References
- https://git.kernel.org/stable/c/15e35fdad7a5576bf3f1c8d688877aeb5d1b506b
- https://git.kernel.org/stable/c/192878df582c51d440bf7b91a15f297f29f2b596
- https://git.kernel.org/stable/c/1fade1b2ac5b1a4948e538fae7313bea57b5ac36
- https://git.kernel.org/stable/c/26dac5c9ffb20812b475fdf253eb04fab99cff3b
- https://git.kernel.org/stable/c/27ed642a4e7e4b5df4b8522c72c457a67e052493
- https://git.kernel.org/stable/c/35772b4981f38ba8059372cde8753e8e477e98ec
- https://git.kernel.org/stable/c/4e80eff5c1c893aca2ac1d202f0b256d2e52ecde
- https://git.kernel.org/stable/c/b1256090816ec46011601e084be580731df58fc7
FAQ
What is CVE-2026-80586?
CVE-2026-80586 is a vulnerability with a CVSS score of 9.8 (CRITICAL). 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 b...
How severe is CVE-2026-80586?
CVE-2026-80586 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-80586?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.