CVE-2025-40293

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> iommufd: Don&amp;#39;t overflow during division for dirty tracking<br /> <br /> If pgshift is 63 then BITS_PER_TYPE(*bitmap-&gt;bitmap) * pgsize will overflow<br /> to 0 and this triggers divide by 0.<br /> <br /> In this case the index should just be 0, so reorganize things to divide<br /> by shift and avoid hitting any overflows.