CVE-2023-53867

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> ceph: fix potential use-after-free bug when trimming caps<br /> <br /> When trimming the caps and just after the &amp;#39;session-&gt;s_cap_lock&amp;#39; is<br /> released in ceph_iterate_session_caps() the cap maybe removed by<br /> another thread, and when using the stale cap memory in the callbacks<br /> it will trigger use-after-free crash.<br /> <br /> We need to check the existence of the cap just after the &amp;#39;ci-&gt;i_ceph_lock&amp;#39;<br /> being acquired. And do nothing if it&amp;#39;s already removed.