https://vulnerability.circl.lu Contains only the most 10 recent entries. http://www.rssboard.org/rss-specification python-feedgen en Fri, 02 Oct 2026 15:31:55 +0000 https://vulnerability.circl.lu/vuln/cve-2025-22036 <p><strong>Affected:</strong> Linux</p> <p>In the Linux kernel, the following vulnerability has been resolved:</p> <p>exfat: fix random stack corruption after get_block</p> <p>When get_block is called with a buffer_head allocated on the stack, such as do_mpage_readpage, stack corruption due to buffer_head UAF may occur in the following race condition situation.</p> <p>&lt;CPU 0&gt; &lt;CPU 1&gt; mpage_read_folio &lt;&lt;bh on stack&gt;&gt; do_mpage_readpage exfat_get_block bh_read __bh_read get_bh(bh) submit_bh wait_on_buffer ... end_buffer_read_sync __end_buffer_read_notouch unlock_buffer &lt;&lt;keep going&gt;&gt; ... ... ... ... &lt;&lt;bh is not valid out of mpage_read_folio&gt;&gt; . . another_function &lt;&lt;variable A on stack&gt;&gt; put_bh(bh) atomic_dec(bh-&gt;b_count) * stack corruption here *</p> <p>This patch returns -EAGAIN if a folio does not have buffers when bh_read needs to be called. By doing this, the caller can fallback to functions like block_read_full_folio(), create a buffer_head in the folio, and then call get_block again.</p> <p>Let&#39;s do not call bh_read() with on-stack buffer_head.</p> <p><strong>Affected:</strong> Linux</p> <p>In the Linux kernel, the following vulnerability has been resolved:</p> <p>exfat: fix random stack corruption after get_block</p> <p>When get_block is called with a buffer_head allocated on the stack, such as do_mpage_readpage, stack corruption due to buffer_head UAF may occur in the following race condition situation.</p> <p>&lt;CPU 0&gt; &lt;CPU 1&gt; mpage_read_folio &lt;&lt;bh on stack&gt;&gt; do_mpage_readpage exfat_get_block bh_read __bh_read get_bh(bh) submit_bh wait_on_buffer ... end_buffer_read_sync __end_buffer_read_notouch unlock_buffer &lt;&lt;keep going&gt;&gt; ... ... ... ... &lt;&lt;bh is not valid out of mpage_read_folio&gt;&gt; . . another_function &lt;&lt;variable A on stack&gt;&gt; put_bh(bh) atomic_dec(bh-&gt;b_count) * stack corruption here *</p> <p>This patch returns -EAGAIN if a folio does not have buffers when bh_read needs to be called. By doing this, the caller can fallback to functions like block_read_full_folio(), create a buffer_head in the folio, and then call get_block again.</p> <p>Let&#39;s do not call bh_read() with on-stack buffer_head.</p> https://vulnerability.circl.lu/vuln/cve-2025-22036