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    <title>Most recent entries from all</title>
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    <lastBuildDate>Tue, 06 Oct 2026 14:08:24 +0000</lastBuildDate>
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      <title>CVE-2021-47248 — udp: fix race between close() and udp_abort()</title>
      <link>https://cve.radiocsirt.org/vuln/cve-2021-47248</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;udp: fix race between close() and udp_abort()&lt;/p&gt;
&lt;p&gt;Kaustubh reported and diagnosed a panic in udp_lib_lookup().
The root cause is udp_abort() racing with close(). Both
racing functions acquire the socket lock, but udp{v6}_destroy_sock()
release it before performing destructive actions.&lt;/p&gt;
&lt;p&gt;We can&amp;#39;t easily extend the socket lock scope to avoid the race,
instead use the SOCK_DEAD flag to prevent udp_abort from doing
any action when the critical race happens.&lt;/p&gt;
&lt;p&gt;Diagnosed-and-tested-by: Kaustubh Pandey &amp;lt;kapandey@codeaurora.org&amp;gt;&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;udp: fix race between close() and udp_abort()&lt;/p&gt;
&lt;p&gt;Kaustubh reported and diagnosed a panic in udp_lib_lookup().
The root cause is udp_abort() racing with close(). Both
racing functions acquire the socket lock, but udp{v6}_destroy_sock()
release it before performing destructive actions.&lt;/p&gt;
&lt;p&gt;We can&amp;#39;t easily extend the socket lock scope to avoid the race,
instead use the SOCK_DEAD flag to prevent udp_abort from doing
any action when the critical race happens.&lt;/p&gt;
&lt;p&gt;Diagnosed-and-tested-by: Kaustubh Pandey &amp;lt;kapandey@codeaurora.org&amp;gt;&lt;/p&gt;</content:encoded>
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