https://vulnerability.circl.lu Contains only the most 10 recent entries. http://www.rssboard.org/rss-specification python-feedgen en Tue, 29 Sep 2026 16:51:44 +0000 https://vulnerability.circl.lu/vuln/cve-2023-53222 <p><strong>Affected:</strong> Linux</p> <p>In the Linux kernel, the following vulnerability has been resolved:</p> <p>jfs: jfs_dmap: Validate db_l2nbperpage while mounting</p> <p>In jfs_dmap.c at line 381, BLKTODMAP is used to get a logical block number inside dbFree(). db_l2nbperpage, which is the log2 number of blocks per page, is passed as an argument to BLKTODMAP which uses it for shifting.</p> <p>Syzbot reported a shift out-of-bounds crash because db_l2nbperpage is too big. This happens because the large value is set without any validation in dbMount() at line 181.</p> <p>Thus, make sure that db_l2nbperpage is correct while mounting.</p> <p>Max number of blocks per page = Page size / Min block size =&gt; log2(Max num_block per page) = log2(Page size / Min block size) = log2(Page size) - log2(Min block size)</p> <p>=&gt; Max db_l2nbperpage = L2PSIZE - L2MINBLOCKSIZE</p> <p><strong>Affected:</strong> Linux</p> <p>In the Linux kernel, the following vulnerability has been resolved:</p> <p>jfs: jfs_dmap: Validate db_l2nbperpage while mounting</p> <p>In jfs_dmap.c at line 381, BLKTODMAP is used to get a logical block number inside dbFree(). db_l2nbperpage, which is the log2 number of blocks per page, is passed as an argument to BLKTODMAP which uses it for shifting.</p> <p>Syzbot reported a shift out-of-bounds crash because db_l2nbperpage is too big. This happens because the large value is set without any validation in dbMount() at line 181.</p> <p>Thus, make sure that db_l2nbperpage is correct while mounting.</p> <p>Max number of blocks per page = Page size / Min block size =&gt; log2(Max num_block per page) = log2(Page size / Min block size) = log2(Page size) - log2(Min block size)</p> <p>=&gt; Max db_l2nbperpage = L2PSIZE - L2MINBLOCKSIZE</p> https://vulnerability.circl.lu/vuln/cve-2023-53222