In the Linux kernel, the following vulnerability has been resolved:

RDMA: During rereg_mr ensure that REREG_ACCESS is compatible

If IB_MR_REREG_ACCESS changes from RO to RW then the umem has to be
re-evaluated to ensure it is properly pinned as RW. Since the umem is
hidden inside each driver's mr struct add a ib_umem_check_rereg() function
that each driver has to call before processing IB_MR_REREG_ACCESS.

mlx4 has to retain its duplicate ib_access_writable check because it
implements IB_MR_REREG_ACCESS | IB_MR_REREG_TRANS by changing both items
in place sequentially while the MR is live, so it will continue to not
support this combination.

https://git.kernel.org/stable/c/09dc18894148381d3bfc550083b1236043870dce

https://git.kernel.org/stable/c/2904e985a2917b5dac65df82733065e78a65fc9d

https://git.kernel.org/stable/c/50334a05a950840b39a1ce3d2a173b4183db9b3e

https://git.kernel.org/stable/c/badad6fad60def1b9805559dd81dbab3d97b82aa

https://git.kernel.org/stable/c/eba5df21eda0fe7418efbea2f799f8ea1b8ca94c

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