https://vulnerability.circl.lu Contains only the most 10 recent entries. http://www.rssboard.org/rss-specification python-feedgen en Wed, 30 Sep 2026 03:08:57 +0000 https://vulnerability.circl.lu/vuln/cve-2024-42304 <p><strong>Affected:</strong> Linux, Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem</p> <p>In the Linux kernel, the following vulnerability has been resolved:</p> <p>ext4: make sure the first directory block is not a hole</p> <p>The syzbot constructs a directory that has no dirblock but is non-inline, i.e. the first directory block is a hole. And no errors are reported when creating files in this directory in the following flow.</p> <p>ext4_mknod ... ext4_add_entry // Read block 0 ext4_read_dirblock(dir, block, DIRENT) bh = ext4_bread(NULL, inode, block, 0) if (!bh &amp;&amp; (type == INDEX || type == DIRENT_HTREE)) // The first directory block is a hole // But type == DIRENT, so no error is reported.</p> <p>After that, we get a directory block without &#39;.&#39; and &#39;..&#39; but with a valid dentry. This may cause some code that relies on dot or dotdot (such as make_indexed_dir()) to crash.</p> <p>Therefore when ext4_read_dirblock() finds that the first directory block is a hole report that the filesystem is corrupted and return an error to avoid loading corrupted data from disk causing something bad.</p> <p><strong>Affected:</strong> Linux, Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem</p> <p>In the Linux kernel, the following vulnerability has been resolved:</p> <p>ext4: make sure the first directory block is not a hole</p> <p>The syzbot constructs a directory that has no dirblock but is non-inline, i.e. the first directory block is a hole. And no errors are reported when creating files in this directory in the following flow.</p> <p>ext4_mknod ... ext4_add_entry // Read block 0 ext4_read_dirblock(dir, block, DIRENT) bh = ext4_bread(NULL, inode, block, 0) if (!bh &amp;&amp; (type == INDEX || type == DIRENT_HTREE)) // The first directory block is a hole // But type == DIRENT, so no error is reported.</p> <p>After that, we get a directory block without &#39;.&#39; and &#39;..&#39; but with a valid dentry. This may cause some code that relies on dot or dotdot (such as make_indexed_dir()) to crash.</p> <p>Therefore when ext4_read_dirblock() finds that the first directory block is a hole report that the filesystem is corrupted and return an error to avoid loading corrupted data from disk causing something bad.</p> https://vulnerability.circl.lu/vuln/cve-2024-42304