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    <lastBuildDate>Tue, 06 Oct 2026 13:30:58 +0000</lastBuildDate>
    <item>
      <title>CVE-2021-46937 — mm/damon/dbgfs: fix 'struct pid' leaks in 'dbgfs_target_ids_write()'</title>
      <link>https://cve.radiocsirt.org/vuln/cve-2021-46937</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;mm/damon/dbgfs: fix &amp;#39;struct pid&amp;#39; leaks in &amp;#39;dbgfs_target_ids_write()&amp;#39;&lt;/p&gt;
&lt;p&gt;DAMON debugfs interface increases the reference counts of &amp;#39;struct pid&amp;#39;s
for targets from the &amp;#39;target_ids&amp;#39; file write callback
(&amp;#39;dbgfs_target_ids_write()&amp;#39;), but decreases the counts only in DAMON
monitoring termination callback (&amp;#39;dbgfs_before_terminate()&amp;#39;).&lt;/p&gt;
&lt;p&gt;Therefore, when &amp;#39;target_ids&amp;#39; file is repeatedly written without DAMON
monitoring start/termination, the reference count is not decreased and
therefore memory for the &amp;#39;struct pid&amp;#39; cannot be freed.  This commit
fixes this issue by decreasing the reference counts when &amp;#39;target_ids&amp;#39; is
written.&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;mm/damon/dbgfs: fix &amp;#39;struct pid&amp;#39; leaks in &amp;#39;dbgfs_target_ids_write()&amp;#39;&lt;/p&gt;
&lt;p&gt;DAMON debugfs interface increases the reference counts of &amp;#39;struct pid&amp;#39;s
for targets from the &amp;#39;target_ids&amp;#39; file write callback
(&amp;#39;dbgfs_target_ids_write()&amp;#39;), but decreases the counts only in DAMON
monitoring termination callback (&amp;#39;dbgfs_before_terminate()&amp;#39;).&lt;/p&gt;
&lt;p&gt;Therefore, when &amp;#39;target_ids&amp;#39; file is repeatedly written without DAMON
monitoring start/termination, the reference count is not decreased and
therefore memory for the &amp;#39;struct pid&amp;#39; cannot be freed.  This commit
fixes this issue by decreasing the reference counts when &amp;#39;target_ids&amp;#39; is
written.&lt;/p&gt;</content:encoded>
      <guid isPermaLink="false">https://cve.radiocsirt.org/vuln/cve-2021-46937</guid>
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