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    <lastBuildDate>Wed, 07 Oct 2026 07:16:55 +0000</lastBuildDate>
    <item>
      <title>CVE-2024-42253 — gpio: pca953x: fix pca953x_irq_bus_sync_unlock race</title>
      <link>https://cve.radiocsirt.org/vuln/cve-2024-42253</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;gpio: pca953x: fix pca953x_irq_bus_sync_unlock race&lt;/p&gt;
&lt;p&gt;Ensure that `i2c_lock&amp;#39; is held when setting interrupt latch and mask in
pca953x_irq_bus_sync_unlock() in order to avoid races.&lt;/p&gt;
&lt;p&gt;The other (non-probe) call site pca953x_gpio_set_multiple() ensures the
lock is held before calling pca953x_write_regs().&lt;/p&gt;
&lt;p&gt;The problem occurred when a request raced against irq_bus_sync_unlock()
approximately once per thousand reboots on an i.MX8MP based system.&lt;/p&gt;
&lt;p&gt;* Normal case&lt;/p&gt;
&lt;p&gt;0-0022: write register AI|3a {03,02,00,00,01} Input latch P0
   0-0022: write register AI|49 {fc,fd,ff,ff,fe} Interrupt mask P0
   0-0022: write register AI|08 {ff,00,00,00,00} Output P3
   0-0022: write register AI|12 {fc,00,00,00,00} Config P3&lt;/p&gt;
&lt;p&gt;* Race case&lt;/p&gt;
&lt;p&gt;0-0022: write register AI|08 {ff,00,00,00,00} Output P3
   0-0022: write register AI|08 {03,02,00,00,01} *** Wrong register ***
   0-0022: write register AI|12 {fc,00,00,00,00} Config P3
   0-0022: write register AI|49 {fc,fd,ff,ff,fe} Interrupt mask P0&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;gpio: pca953x: fix pca953x_irq_bus_sync_unlock race&lt;/p&gt;
&lt;p&gt;Ensure that `i2c_lock&amp;#39; is held when setting interrupt latch and mask in
pca953x_irq_bus_sync_unlock() in order to avoid races.&lt;/p&gt;
&lt;p&gt;The other (non-probe) call site pca953x_gpio_set_multiple() ensures the
lock is held before calling pca953x_write_regs().&lt;/p&gt;
&lt;p&gt;The problem occurred when a request raced against irq_bus_sync_unlock()
approximately once per thousand reboots on an i.MX8MP based system.&lt;/p&gt;
&lt;p&gt;* Normal case&lt;/p&gt;
&lt;p&gt;0-0022: write register AI|3a {03,02,00,00,01} Input latch P0
   0-0022: write register AI|49 {fc,fd,ff,ff,fe} Interrupt mask P0
   0-0022: write register AI|08 {ff,00,00,00,00} Output P3
   0-0022: write register AI|12 {fc,00,00,00,00} Config P3&lt;/p&gt;
&lt;p&gt;* Race case&lt;/p&gt;
&lt;p&gt;0-0022: write register AI|08 {ff,00,00,00,00} Output P3
   0-0022: write register AI|08 {03,02,00,00,01} *** Wrong register ***
   0-0022: write register AI|12 {fc,00,00,00,00} Config P3
   0-0022: write register AI|49 {fc,fd,ff,ff,fe} Interrupt mask P0&lt;/p&gt;</content:encoded>
      <guid isPermaLink="false">https://cve.radiocsirt.org/vuln/cve-2024-42253</guid>
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