https://vulnerability.circl.lu Contains only the most 10 recent entries. http://www.rssboard.org/rss-specification python-feedgen en Tue, 29 Sep 2026 15:45:14 +0000 https://vulnerability.circl.lu/vuln/cve-2023-53511 <p><strong>Affected:</strong> Linux</p> <p>In the Linux kernel, the following vulnerability has been resolved:</p> <p>io_uring: fix fget leak when fs don&#39;t support nowait buffered read</p> <p>Heming reported a BUG when using io_uring doing link-cp on ocfs2. [1]</p> <p>Do the following steps can reproduce this BUG: mount -t ocfs2 /dev/vdc /mnt/ocfs2 cp testfile /mnt/ocfs2/ ./link-cp /mnt/ocfs2/testfile /mnt/ocfs2/testfile.1 umount /mnt/ocfs2</p> <p>Then umount will fail, and it outputs: umount: /mnt/ocfs2: target is busy.</p> <p>While tracing umount, it blames mnt_get_count() not return as expected. Do a deep investigation for fget()/fput() on related code flow, I&#39;ve finally found that fget() leaks since ocfs2 doesn&#39;t support nowait buffered read.</p> <p>io_issue_sqe |-io_assign_file // do fget() first |-io_read |-io_iter_do_read |-ocfs2_file_read_iter // return -EOPNOTSUPP |-kiocb_done |-io_rw_done |-__io_complete_rw_common // set REQ_F_REISSUE |-io_resubmit_prep |-io_req_prep_async // override req-&gt;file, leak happens</p> <p>This was introduced by commit a196c78b5443 in v5.18. Fix it by don&#39;t re-assign req-&gt;file if it has already been assigned.</p> <p>[1] https://lore.kernel.org/ocfs2-devel/ab580a75-91c8-d68a-3455-40361be1bfa8@linux.alibaba.com/T/#t</p> <p><strong>Affected:</strong> Linux</p> <p>In the Linux kernel, the following vulnerability has been resolved:</p> <p>io_uring: fix fget leak when fs don&#39;t support nowait buffered read</p> <p>Heming reported a BUG when using io_uring doing link-cp on ocfs2. [1]</p> <p>Do the following steps can reproduce this BUG: mount -t ocfs2 /dev/vdc /mnt/ocfs2 cp testfile /mnt/ocfs2/ ./link-cp /mnt/ocfs2/testfile /mnt/ocfs2/testfile.1 umount /mnt/ocfs2</p> <p>Then umount will fail, and it outputs: umount: /mnt/ocfs2: target is busy.</p> <p>While tracing umount, it blames mnt_get_count() not return as expected. Do a deep investigation for fget()/fput() on related code flow, I&#39;ve finally found that fget() leaks since ocfs2 doesn&#39;t support nowait buffered read.</p> <p>io_issue_sqe |-io_assign_file // do fget() first |-io_read |-io_iter_do_read |-ocfs2_file_read_iter // return -EOPNOTSUPP |-kiocb_done |-io_rw_done |-__io_complete_rw_common // set REQ_F_REISSUE |-io_resubmit_prep |-io_req_prep_async // override req-&gt;file, leak happens</p> <p>This was introduced by commit a196c78b5443 in v5.18. Fix it by don&#39;t re-assign req-&gt;file if it has already been assigned.</p> <p>[1] https://lore.kernel.org/ocfs2-devel/ab580a75-91c8-d68a-3455-40361be1bfa8@linux.alibaba.com/T/#t</p> https://vulnerability.circl.lu/vuln/cve-2023-53511