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    <lastBuildDate>Tue, 29 Sep 2026 17:16:10 +0000</lastBuildDate>
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      <title>CVE-2026-80586 — mptcp: options: reset DSS fields in case of unexpected size</title>
      <link>https://vulnerability.circl.lu/vuln/cve-2026-80586</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Linux&lt;/p&gt;
&lt;p&gt;In the Linux kernel, the following vulnerability has been resolved:&lt;/p&gt;
&lt;p&gt;mptcp: options: reset DSS fields in case of unexpected size&lt;/p&gt;
&lt;p&gt;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.&lt;/p&gt;
&lt;p&gt;Explicitly reset the fields that could have been modified in case of
unexpected size.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Linux&lt;/p&gt;
&lt;p&gt;In the Linux kernel, the following vulnerability has been resolved:&lt;/p&gt;
&lt;p&gt;mptcp: options: reset DSS fields in case of unexpected size&lt;/p&gt;
&lt;p&gt;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.&lt;/p&gt;
&lt;p&gt;Explicitly reset the fields that could have been modified in case of
unexpected size.&lt;/p&gt;</content:encoded>
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