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    <lastBuildDate>Wed, 07 Oct 2026 15:57:47 +0000</lastBuildDate>
    <item>
      <title>CVE-2025-22009 — regulator: dummy: force synchronous probing</title>
      <link>https://cve.radiocsirt.org/vuln/cve-2025-22009</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;regulator: dummy: force synchronous probing&lt;/p&gt;
&lt;p&gt;Sometimes I get a NULL pointer dereference at boot time in kobject_get()
with the following call stack:&lt;/p&gt;
&lt;p&gt;anatop_regulator_probe()
 devm_regulator_register()
  regulator_register()
   regulator_resolve_supply()
    kobject_get()&lt;/p&gt;
&lt;p&gt;By placing some extra BUG_ON() statements I could verify that this is
raised because probing of the &amp;#39;dummy&amp;#39; regulator driver is not completed
(&amp;#39;dummy_regulator_rdev&amp;#39; is still NULL).&lt;/p&gt;
&lt;p&gt;In the JTAG debugger I can see that dummy_regulator_probe() and
anatop_regulator_probe() can be run by different kernel threads
(kworker/u4:*).  I haven&amp;#39;t further investigated whether this can be
changed or if there are other possibilities to force synchronization
between these two probe routines.  On the other hand I don&amp;#39;t expect much
boot time penalty by probing the &amp;#39;dummy&amp;#39; regulator synchronously.&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;regulator: dummy: force synchronous probing&lt;/p&gt;
&lt;p&gt;Sometimes I get a NULL pointer dereference at boot time in kobject_get()
with the following call stack:&lt;/p&gt;
&lt;p&gt;anatop_regulator_probe()
 devm_regulator_register()
  regulator_register()
   regulator_resolve_supply()
    kobject_get()&lt;/p&gt;
&lt;p&gt;By placing some extra BUG_ON() statements I could verify that this is
raised because probing of the &amp;#39;dummy&amp;#39; regulator driver is not completed
(&amp;#39;dummy_regulator_rdev&amp;#39; is still NULL).&lt;/p&gt;
&lt;p&gt;In the JTAG debugger I can see that dummy_regulator_probe() and
anatop_regulator_probe() can be run by different kernel threads
(kworker/u4:*).  I haven&amp;#39;t further investigated whether this can be
changed or if there are other possibilities to force synchronization
between these two probe routines.  On the other hand I don&amp;#39;t expect much
boot time penalty by probing the &amp;#39;dummy&amp;#39; regulator synchronously.&lt;/p&gt;</content:encoded>
      <guid isPermaLink="false">https://cve.radiocsirt.org/vuln/cve-2025-22009</guid>
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