---
id: CVE-2026-89510
title: >-
  kernel: RDMA/cxgb4: Cancel reg_work before freeing device on remove
  (CVE-2026-89510)
summary: >-
  A flaw was found in the Linux kernel's RDMA/cxgb4 component. This
  vulnerability occurs when the `c4iw_remove()` function frees a device while
  its registration work (`reg_work`) is still pending or actively running. This
  timing issue can le…
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-825
vendor: Red Hat
product: Red Hat Enterprise Linux 9
affected:
  - enterprise_linux 10
  - enterprise_linux 6
  - enterprise_linux 7
  - enterprise_linux 8
  - enterprise_linux 9
  - openshift_container_platform 4
published: '2026-09-11'
updated: '2026-09-14'
sourceUpdated: '2026-09-14T14:49:03+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89510.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89510.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89510'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532033'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89510'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89510'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89510.mbox
  - url: 'https://git.kernel.org/stable/c/e6e79e7be87c5ea92728060a3d7fb56890a91e45'
  - url: 'https://git.kernel.org/stable/c/672ee1981db10569ec96030bddb322f18382ec04'
  - url: 'https://git.kernel.org/stable/c/4681e731db07769846901cfabdd3e53f765eb9d3'
  - url: 'https://git.kernel.org/stable/c/3265d558dfafab8f12f5fba06ebbf15cae9f3225'
  - url: 'https://git.kernel.org/stable/c/fe9c591026c576d8b1f72aab5e4cd67350530763'
  - url: 'https://git.kernel.org/stable/c/85f438382a865a4dc4c50e6b884310bb2b60fc4d'
  - url: 'https://git.kernel.org/stable/c/320e5258a53af0abc5abd9eb01519a48bab2dee8'
  - url: 'https://git.kernel.org/stable/c/a7100601aa1a39f799a566acce10db20eaf4b7f2'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
epss: 0.00176
epssPercentile: 0.0631
scores:
  vendor: 7
  cna: 7.8
ingestedAt: '2026-09-14T15:23:07.452Z'
---

## Overview

A flaw was found in the Linux kernel's RDMA/cxgb4 component. This vulnerability occurs when the `c4iw_remove()` function frees a device while its registration work (`reg_work`) is still pending or actively running. This timing issue can lead to the `c4iw_register_device()` function attempting to access memory that has already been deallocated. The primary consequence of this use-after-free vulnerability is system instability, which could potentially lead to a denial of service.

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, … · updated 2026-09-14 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89510.json)

**kernel: RDMA/cxgb4: Cancel reg_work before freeing device on remove** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-14.

Affected:

- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4

No fix planned:

- Red Hat Enterprise Linux 6
- 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