---
id: CVE-2026-89533
title: 'kernel: svcrdma: Fix offset arithmetic in read_chunk_range (CVE-2026-89533)'
summary: >-
  A flaw was found in the `svcrdma` component of the Linux kernel. Incorrect
  offset arithmetic in the `svc_rdma_read_chunk_range()` function can lead to a
  `u32` underflow. This underflow can cause the system to attempt to allocate a
  large am…
severity: high
cvss: 7
cvssVector: 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H'
cvssSource: vendor
cwe: CWE-191
vendor: Red Hat
product: Red Hat Enterprise Linux 9
affected:
  - enterprise_linux 10
  - enterprise_linux 8
  - enterprise_linux 9
  - openshift_container_platform 4
published: '2026-09-11'
updated: '2026-09-14'
sourceUpdated: '2026-09-14T18:58:30+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89533.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89533.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89533'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532058'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89533'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89533'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89533.mbox
  - url: 'https://git.kernel.org/stable/c/10873311f91db9454e2fadbf9866bc819e0646d9'
  - url: 'https://git.kernel.org/stable/c/addbf02dfe3b25e7e38e03bbd4e2a6ed86a14be7'
  - url: 'https://git.kernel.org/stable/c/cba8543c18cf42fd80fd63effb6df6ff4f7e73ce'
  - url: 'https://git.kernel.org/stable/c/6ee4dc7476b3abc92ec1d444533a559f33f59561'
  - url: 'https://git.kernel.org/stable/c/a46b35f213c2426f5d6a0458a8f7e873fc59cdfd'
  - url: 'https://git.kernel.org/stable/c/4493c96bbd0068fadf69cbae8d13426202e34cdc'
  - url: 'https://git.kernel.org/stable/c/4a44c140cc2f3643a39e258bb0c0ab9d0f494f5e'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
  - score-dispute
epss: 0.00738
epssPercentile: 0.52505
scores:
  vendor: 7
  cna: 9.8
ingestedAt: '2026-09-14T15:23:07.452Z'
---

## Overview

A flaw was found in the `svcrdma` component of the Linux kernel. Incorrect offset arithmetic in the `svc_rdma_read_chunk_range()` function can lead to a `u32` underflow. This underflow can cause the system to attempt to allocate a large amount of memory, potentially resulting in a Denial of Service (DoS) due to excessive memory consumption.

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-09-14 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89533.json)

**kernel: svcrdma: Fix offset arithmetic in read_chunk_range** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-14.

Affected:

- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4

No fix planned:

- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4

Not affected:

- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7

## Remediation

Affected