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CVE WatchAug 27, 2026

CVE-2026-80586

In the Linux kernel, the following vulnerability has been resolved: mptcp: options: reset DSS fields in case of unexpected size A remote p

CVSS

9.8

Critical

EPSS

KEV

Exploit Today

0-100

Published: Aug 26, 2026 · Last modified: Aug 27, 2026

EPSS · 30d

Not enough EPSS history yet.

Technical 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.

Official references
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