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    <lastBuildDate>Tue, 06 Oct 2026 21:52:51 +0000</lastBuildDate>
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      <title>CVE-2023-52942 — cgroup/cpuset: Fix wrong check in update_parent_subparts_cpumask()</title>
      <link>https://cve.radiocsirt.org/vuln/cve-2023-52942</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;cgroup/cpuset: Fix wrong check in update_parent_subparts_cpumask()&lt;/p&gt;
&lt;p&gt;It was found that the check to see if a partition could use up all
the cpus from the parent cpuset in update_parent_subparts_cpumask()
was incorrect. As a result, it is possible to leave parent with no
effective cpu left even if there are tasks in the parent cpuset. This
can lead to system panic as reported in [1].&lt;/p&gt;
&lt;p&gt;Fix this probem by updating the check to fail the enabling the partition
if parent&amp;#39;s effective_cpus is a subset of the child&amp;#39;s cpus_allowed.&lt;/p&gt;
&lt;p&gt;Also record the error code when an error happens in update_prstate()
and add a test case where parent partition and child have the same cpu
list and parent has task. Enabling partition in the child will fail in
this case.&lt;/p&gt;
&lt;p&gt;[1] https://www.spinics.net/lists/cgroups/msg36254.html&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;cgroup/cpuset: Fix wrong check in update_parent_subparts_cpumask()&lt;/p&gt;
&lt;p&gt;It was found that the check to see if a partition could use up all
the cpus from the parent cpuset in update_parent_subparts_cpumask()
was incorrect. As a result, it is possible to leave parent with no
effective cpu left even if there are tasks in the parent cpuset. This
can lead to system panic as reported in [1].&lt;/p&gt;
&lt;p&gt;Fix this probem by updating the check to fail the enabling the partition
if parent&amp;#39;s effective_cpus is a subset of the child&amp;#39;s cpus_allowed.&lt;/p&gt;
&lt;p&gt;Also record the error code when an error happens in update_prstate()
and add a test case where parent partition and child have the same cpu
list and parent has task. Enabling partition in the child will fail in
this case.&lt;/p&gt;
&lt;p&gt;[1] https://www.spinics.net/lists/cgroups/msg36254.html&lt;/p&gt;</content:encoded>
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