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CVE-2025-22091 is an integer-overflow defect in the Linux kernel's RDMA mlx5 driver. Values returned by mlx5_umem_mkc_find_best_pgsz() were stored in unsigned int page_size variables although the selected mkey entity size can exceed the supported range of that type. When registering 4 GB of physically contiguous memory, the driver can select a 4 GB page size, which wraps to zero and reaches a WARN_ON() condition in mlx5_ib's alloc_cacheable_mr() path. The correction changes affected page_size variables to unsigned long.
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A Linux kernel RDMA mlx5 driver page_size variable overflow flaw.
A Linux kernel RDMA/mlx5 page_size variable overflow vulnerability addressed by the Red Hat Enterprise Linux 10 kernel security update.
An integer-overflow flaw in the Linux kernel RDMA mlx5 driver. When registering 4GB of physically contiguous memory, the optimized memory-key page size may exceed the range of an unsigned int, overflow to zero, and trigger a kernel warning in alloc_cacheable_mr().
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