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    <link>https://cve.radiocsirt.org</link>
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    <lastBuildDate>Thu, 08 Oct 2026 04:41:51 +0000</lastBuildDate>
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      <title>CVE-2024-26752 — l2tp: pass correct message length to ip6_append_data</title>
      <link>https://cve.radiocsirt.org/vuln/cve-2024-26752</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;l2tp: pass correct message length to ip6_append_data&lt;/p&gt;
&lt;p&gt;l2tp_ip6_sendmsg needs to avoid accounting for the transport header
twice when splicing more data into an already partially-occupied skbuff.&lt;/p&gt;
&lt;p&gt;To manage this, we check whether the skbuff contains data using
skb_queue_empty when deciding how much data to append using
ip6_append_data.&lt;/p&gt;
&lt;p&gt;However, the code which performed the calculation was incorrect:&lt;/p&gt;
&lt;p&gt;ulen = len + skb_queue_empty(&amp;amp;sk-&amp;gt;sk_write_queue) ? transhdrlen : 0;&lt;/p&gt;
&lt;p&gt;...due to C operator precedence, this ends up setting ulen to
transhdrlen for messages with a non-zero length, which results in
corrupted packets on the wire.&lt;/p&gt;
&lt;p&gt;Add parentheses to correct the calculation in line with the original
intent.&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;l2tp: pass correct message length to ip6_append_data&lt;/p&gt;
&lt;p&gt;l2tp_ip6_sendmsg needs to avoid accounting for the transport header
twice when splicing more data into an already partially-occupied skbuff.&lt;/p&gt;
&lt;p&gt;To manage this, we check whether the skbuff contains data using
skb_queue_empty when deciding how much data to append using
ip6_append_data.&lt;/p&gt;
&lt;p&gt;However, the code which performed the calculation was incorrect:&lt;/p&gt;
&lt;p&gt;ulen = len + skb_queue_empty(&amp;amp;sk-&amp;gt;sk_write_queue) ? transhdrlen : 0;&lt;/p&gt;
&lt;p&gt;...due to C operator precedence, this ends up setting ulen to
transhdrlen for messages with a non-zero length, which results in
corrupted packets on the wire.&lt;/p&gt;
&lt;p&gt;Add parentheses to correct the calculation in line with the original
intent.&lt;/p&gt;</content:encoded>
      <guid isPermaLink="false">https://cve.radiocsirt.org/vuln/cve-2024-26752</guid>
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