CVE-2026-98365

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

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

mr_check_range() 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. rxe_mr_iova_to_index() then computes a huge index (int idx, only

guarded by WARN_ON) and rxe_mr_copy_xarray() 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, mr_check_range() returns -EINVAL for the crafted iova and

the responder reports REMOTE_ACCESS_ERROR instead of triggering the OOB.