---
id: CVE-2026-89505
title: 'kernel: RDMA/uverbs: Guard legacy bundles without method_elm (CVE-2026-89505)'
summary: >-
  A flaw was found in the Linux kernel's RDMA/uverbs component. Malformed input
  from a provider in the legacy write path can cause the
  `uverbs_get_handler_fn()` function to dereference an uninitialized pointer.
  This can lead to a system cras…
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cvssSource: vendor
cwe: CWE-824
vendor: Red Hat
product: Red Hat Enterprise Linux 6
affected:
  - enterprise_linux 6
published: '2026-09-11'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T21:34:30+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89505.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89505.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89505'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532252'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89505'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89505'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89505.mbox
  - url: 'https://git.kernel.org/stable/c/60a42d510113f46de47e86a84bf5758597644487'
  - url: 'https://git.kernel.org/stable/c/edae84e5461749ed9adf9fcf5c6e075381040ac3'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
epss: 0.00198
epssPercentile: 0.0846
ingestedAt: '2026-09-14T11:11:19.887Z'
---

## Overview

A flaw was found in the Linux kernel's RDMA/uverbs component. Malformed input from a provider in the legacy write path can cause the `uverbs_get_handler_fn()` function to dereference an uninitialized pointer. This can lead to a system crash, resulting in a denial of service.

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 6 · no fix planned: Red Hat Enterprise Linux 6 · updated 2026-09-18 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89505.json)

**kernel: RDMA/uverbs: Guard legacy bundles without method_elm** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-18.

Affected:

- Red Hat Enterprise Linux 6

No fix planned:

- Red Hat Enterprise Linux 6

Not affected:

- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4

## Remediation

Out of support scope