https://vulnerability.circl.lu Contains only the most 10 recent entries. http://www.rssboard.org/rss-specification python-feedgen en Tue, 06 Oct 2026 06:25:48 +0000 https://vulnerability.circl.lu/vuln/cve-2021-47439 <p><strong>Affected:</strong> Linux</p> <p>In the Linux kernel, the following vulnerability has been resolved:</p> <p>net: dsa: microchip: Added the condition for scheduling ksz_mib_read_work</p> <p>When the ksz module is installed and removed using rmmod, kernel crashes with null pointer dereferrence error. During rmmod, ksz_switch_remove function tries to cancel the mib_read_workqueue using cancel_delayed_work_sync routine and unregister switch from dsa.</p> <p>During dsa_unregister_switch it calls ksz_mac_link_down, which in turn reschedules the workqueue since mib_interval is non-zero. Due to which queue executed after mib_interval and it tries to access dp-&gt;slave. But the slave is unregistered in the ksz_switch_remove function. Hence kernel crashes.</p> <p>To avoid this crash, before canceling the workqueue, resetted the mib_interval to 0.</p> <p>v1 -&gt; v2: -Removed the if condition in ksz_mib_read_work</p> <p><strong>Affected:</strong> Linux</p> <p>In the Linux kernel, the following vulnerability has been resolved:</p> <p>net: dsa: microchip: Added the condition for scheduling ksz_mib_read_work</p> <p>When the ksz module is installed and removed using rmmod, kernel crashes with null pointer dereferrence error. During rmmod, ksz_switch_remove function tries to cancel the mib_read_workqueue using cancel_delayed_work_sync routine and unregister switch from dsa.</p> <p>During dsa_unregister_switch it calls ksz_mac_link_down, which in turn reschedules the workqueue since mib_interval is non-zero. Due to which queue executed after mib_interval and it tries to access dp-&gt;slave. But the slave is unregistered in the ksz_switch_remove function. Hence kernel crashes.</p> <p>To avoid this crash, before canceling the workqueue, resetted the mib_interval to 0.</p> <p>v1 -&gt; v2: -Removed the if condition in ksz_mib_read_work</p> https://vulnerability.circl.lu/vuln/cve-2021-47439