CVE-2025-40293

A divide-by-zero vulnerability was found in the iommufd dirty tracking code in the Linux kernel. When pgshift is 63, an integer overflow causes the divisor to become zero, triggering a kernel crash. This occurs during dirty bitmap index calculations for IOMMU operations.

iommufd is used for userspace IOMMU management, primarily in virtualization contexts. Triggering requires specific pgshift values of 63, which is an edge case unlikely in normal operation.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.