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CVE-2026-52908 is a Linux kernel RDMA vulnerability in memory region re-registration handling. During rereg_mr, changes to IB_MR_REREG_ACCESS were not adequately validated for compatibility. Specifically, when a memory region's access changed from read-only to read-write, the associated umem needed to be re-evaluated to ensure it was pinned with writable permissions. Because the umem is encapsulated within each driver's MR structure, the fix introduced an ib_umem_check_rereg() helper that RDMA drivers must call before processing IB_MR_REREG_ACCESS. The issue affects RDMA driver handling of MR access transitions and could result in incorrect writable access state being accepted without proper umem validation.
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