CVE-2026-90423RDMA/rxe: Fix UAF in ODP init error-handling path

Official description

In the Linux kernel, the following vulnerability has been resolved: RDMA/rxe: Fix UAF in ODP init error-handling path rxe_odp_mr_init_user() stores &umem_odp->umem in mr->umem before calling rxe_odp_init_pages(). If rxe_odp_init_pages() fails, rxe_odp_mr_init_user() releases umem_odp and returns an error. rxe_reg_user_mr() then unwinds the error through rxe_cleanup(), rxe_mr_cleanup(), ib_umem_release(mr->umem). There is an IS_ERR_OR_NULL(umem) check at the start of ib_umem_release(). But since mr->umem is NOT reset to NULL in the error handling path of rxe_odp_mr_init_user(), the check passes and it reads already-freed fields like umem->is_dmabuf, causing UAF. Fix the UAF by clearing mr->umem after releasing the failed ODP umem so the MR cleanup path does not release it again.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/5f1933163327c9f1c8f2a341c6cb551aaf231ff9
• https://git.kernel.org/stable/c/4cfb448705da3171d44d9cbe7be53ff03284d532
• https://git.kernel.org/stable/c/51f2c8d2c99fc1f452f7113c08a35edcc4bf8732