CVE-2026-98365

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

RDMA/rxe: Fix integer overflow in mrcheckrange() leading to OOB access

mrcheckrange() validates that [iova, iova+length) falls within the

registered MR range using wraparound-prone arithmetic:

    if (iova < mr->ibmr.iova ||

        iova + length > mr->ibmr.iova + mr->ibmr.length)

A remote peer can craft an RDMA-Write/Read RETH so that iova + length

wraps to 0 (e.g. iova=0xfffffffffffffff8, length=8), bypassing the

check. rxemriovatoindex() then computes a huge index (int idx, only

guarded by WARNON) and rxemrcopyxarray() dereferences

mr->page_info[huge], causing an out-of-bounds read/write and a kernel

oops that is triggerable by an unauthenticated remote peer.

Rewrite the check in overflow-safe form; the first two clauses guarantee

that the subsequent subtractions do not underflow:

    if (iova < mr->ibmr.iova ||

        length > mr->ibmr.length ||

        iova - mr->ibmr.iova > mr->ibmr.length - length)

With the fix, mrcheckrange() returns -EINVAL for the crafted iova and

the responder reports REMOTEACCESSERROR instead of triggering the OOB.