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    <link>https://vulnerability.circl.lu</link>
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    <lastBuildDate>Mon, 28 Sep 2026 18:31:38 +0000</lastBuildDate>
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      <title>CVE-2020-36791 — net_sched: keep alloc_hash updated after hash allocation</title>
      <link>https://vulnerability.circl.lu/vuln/cve-2020-36791</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;net_sched: keep alloc_hash updated after hash allocation&lt;/p&gt;
&lt;p&gt;In commit 599be01ee567 (&amp;#34;net_sched: fix an OOB access in cls_tcindex&amp;#34;)
I moved cp-&amp;gt;hash calculation before the first
tcindex_alloc_perfect_hash(), but cp-&amp;gt;alloc_hash is left untouched.
This difference could lead to another out of bound access.&lt;/p&gt;
&lt;p&gt;cp-&amp;gt;alloc_hash should always be the size allocated, we should
update it after this tcindex_alloc_perfect_hash().&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;net_sched: keep alloc_hash updated after hash allocation&lt;/p&gt;
&lt;p&gt;In commit 599be01ee567 (&amp;#34;net_sched: fix an OOB access in cls_tcindex&amp;#34;)
I moved cp-&amp;gt;hash calculation before the first
tcindex_alloc_perfect_hash(), but cp-&amp;gt;alloc_hash is left untouched.
This difference could lead to another out of bound access.&lt;/p&gt;
&lt;p&gt;cp-&amp;gt;alloc_hash should always be the size allocated, we should
update it after this tcindex_alloc_perfect_hash().&lt;/p&gt;</content:encoded>
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