CVE-2023-53614

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> mm/ksm: fix race with VMA iteration and mm_struct teardown<br /> <br /> exit_mmap() will tear down the VMAs and maple tree with the mmap_lock held<br /> in write mode. Ensure that the maple tree is still valid by checking<br /> ksm_test_exit() after taking the mmap_lock in read mode, but before the<br /> for_each_vma() iterator dereferences a destroyed maple tree.<br /> <br /> Since the maple tree is destroyed, the flags telling lockdep to check an<br /> external lock has been cleared. Skip the for_each_vma() iterator to avoid<br /> dereferencing a maple tree without the external lock flag, which would<br /> create a lockdep warning.