https://vulnerability.circl.lu Contains only the most 10 recent entries. http://www.rssboard.org/rss-specification python-feedgen en Tue, 29 Sep 2026 23:04:46 +0000 https://vulnerability.circl.lu/vuln/cve-2023-53149 <p><strong>Affected:</strong> Linux</p> <p>In the Linux kernel, the following vulnerability has been resolved:</p> <p>ext4: avoid deadlock in fs reclaim with page writeback</p> <p>Ext4 has a filesystem wide lock protecting ext4_writepages() calls to avoid races with switching of journalled data flag or inode format. This lock can however cause a deadlock like:</p> <p>CPU0 CPU1</p> <p>ext4_writepages() percpu_down_read(sbi-&gt;s_writepages_rwsem); ext4_change_inode_journal_flag() percpu_down_write(sbi-&gt;s_writepages_rwsem); - blocks, all readers block from now on ext4_do_writepages() ext4_init_io_end() kmem_cache_zalloc(io_end_cachep, GFP_KERNEL) fs_reclaim frees dentry... dentry_unlink_inode() iput() - last ref =&gt; iput_final() - inode dirty =&gt; write_inode_now()... ext4_writepages() tries to acquire sbi-&gt;s_writepages_rwsem and blocks forever</p> <p>Make sure we cannot recurse into filesystem reclaim from writeback code to avoid the deadlock.</p> <p><strong>Affected:</strong> Linux</p> <p>In the Linux kernel, the following vulnerability has been resolved:</p> <p>ext4: avoid deadlock in fs reclaim with page writeback</p> <p>Ext4 has a filesystem wide lock protecting ext4_writepages() calls to avoid races with switching of journalled data flag or inode format. This lock can however cause a deadlock like:</p> <p>CPU0 CPU1</p> <p>ext4_writepages() percpu_down_read(sbi-&gt;s_writepages_rwsem); ext4_change_inode_journal_flag() percpu_down_write(sbi-&gt;s_writepages_rwsem); - blocks, all readers block from now on ext4_do_writepages() ext4_init_io_end() kmem_cache_zalloc(io_end_cachep, GFP_KERNEL) fs_reclaim frees dentry... dentry_unlink_inode() iput() - last ref =&gt; iput_final() - inode dirty =&gt; write_inode_now()... ext4_writepages() tries to acquire sbi-&gt;s_writepages_rwsem and blocks forever</p> <p>Make sure we cannot recurse into filesystem reclaim from writeback code to avoid the deadlock.</p> https://vulnerability.circl.lu/vuln/cve-2023-53149