https://vulnerability.circl.lu Contains only the most 10 recent entries. http://www.rssboard.org/rss-specification python-feedgen en Wed, 30 Sep 2026 13:57:15 +0000 https://vulnerability.circl.lu/vuln/cve-2026-53130 <p><strong>Affected:</strong> Linux</p> <p>In the Linux kernel, the following vulnerability has been resolved:</p> <p>fs/omfs: reject s_sys_blocksize smaller than OMFS_DIR_START</p> <p>omfs_fill_super() rejects oversized s_sys_blocksize values (&gt; PAGE_SIZE), but it does not reject values smaller than OMFS_DIR_START (0x1b8 = 440).</p> <p>Later, omfs_make_empty() uses</p> <p>sbi-&gt;s_sys_blocksize - OMFS_DIR_START</p> <p>as the length argument to memset(). Since s_sys_blocksize is u32, a crafted filesystem image with s_sys_blocksize &lt; OMFS_DIR_START causes an unsigned underflow there, wrapping to a value near 2^32. That drives a ~4 GiB memset() from bh-&gt;b_data + OMFS_DIR_START and overwrites kernel memory far beyond the backing block buffer.</p> <p>Add the corresponding lower-bound check alongside the existing upper-bound check in omfs_fill_super(), so that malformed images are rejected during superblock validation before any filesystem data is processed.</p> <p><strong>Affected:</strong> Linux</p> <p>In the Linux kernel, the following vulnerability has been resolved:</p> <p>fs/omfs: reject s_sys_blocksize smaller than OMFS_DIR_START</p> <p>omfs_fill_super() rejects oversized s_sys_blocksize values (&gt; PAGE_SIZE), but it does not reject values smaller than OMFS_DIR_START (0x1b8 = 440).</p> <p>Later, omfs_make_empty() uses</p> <p>sbi-&gt;s_sys_blocksize - OMFS_DIR_START</p> <p>as the length argument to memset(). Since s_sys_blocksize is u32, a crafted filesystem image with s_sys_blocksize &lt; OMFS_DIR_START causes an unsigned underflow there, wrapping to a value near 2^32. That drives a ~4 GiB memset() from bh-&gt;b_data + OMFS_DIR_START and overwrites kernel memory far beyond the backing block buffer.</p> <p>Add the corresponding lower-bound check alongside the existing upper-bound check in omfs_fill_super(), so that malformed images are rejected during superblock validation before any filesystem data is processed.</p> https://vulnerability.circl.lu/vuln/cve-2026-53130