CVE-2026-98365 is a vulnerability in Linux Kernel
Published on October 6, 2026
RDMA/rxe: Fix integer overflow in mr_check_range() leading to OOB access
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.
Products Associated with CVE-2026-98365
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Affected Versions
Linux:- Version 8700e3e7c4857d28ebaa824509934556da0b3e76 and below b7d2118660545a00b21e83010ded1a231c6fb8c5 is affected.
- Version 8700e3e7c4857d28ebaa824509934556da0b3e76 and below 5d9426a74fc8cb8f375fcdc19b465a030f9b8cab is affected.
- Version 8700e3e7c4857d28ebaa824509934556da0b3e76 and below 2f3b705144e3a3c14184fec6e354680081fe91ec is affected.
- Version 8700e3e7c4857d28ebaa824509934556da0b3e76 and below 3431f525718f6b07da308cda6d44f8cb548bbd37 is affected.
- Version 8700e3e7c4857d28ebaa824509934556da0b3e76 and below d10e2a08799e858d3e71ea4169bcd018f216d444 is affected.
- Version 4.8 is affected.
- Before 4.8 is unaffected.
- Version 6.6.158, <= 6.6.* is unaffected.
- Version 6.12.112, <= 6.12.* is unaffected.
- Version 6.18.54, <= 6.18.* is unaffected.
- Version 7.2.8, <= 7.2.* is unaffected.
- Version 7.3-rc4, <= * is unaffected.