CVE-2026-52908

CVE-2026-52908 affects the Linux kernel RDMA path: during rereg_mr, changing IB_MR_REREG_ACCESS from RO to RW requires re-evaluating the umem to ensure proper RW pinning. The fix introduces an ib_umem_check_rereg() hook that each driver must call before processing IB_MR_REREG_ACCESS; mlx4 retains...