---
id: CVE-2026-89510
title: 'RDMA/cxgb4: Cancel reg_work before freeing device on remove'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  RDMA/cxgb4: Cancel reg_work before freeing device on remove

  c4iw_uld_state_change() queues reg_work to register the RDMA device.
  c4iw_remove() can free ctx->dev while …
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-825
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 1c8f1da5d851b92aeb81dbbb9ebd516f6e2588f5 <
    e6e79e7be87c5ea92728060a3d7fb56890a91e45
  - >-
    Linux >= 1c8f1da5d851b92aeb81dbbb9ebd516f6e2588f5 <
    672ee1981db10569ec96030bddb322f18382ec04
  - >-
    Linux >= 1c8f1da5d851b92aeb81dbbb9ebd516f6e2588f5 <
    4681e731db07769846901cfabdd3e53f765eb9d3
  - >-
    Linux >= 1c8f1da5d851b92aeb81dbbb9ebd516f6e2588f5 <
    3265d558dfafab8f12f5fba06ebbf15cae9f3225
  - >-
    Linux >= 1c8f1da5d851b92aeb81dbbb9ebd516f6e2588f5 <
    fe9c591026c576d8b1f72aab5e4cd67350530763
  - >-
    Linux >= 1c8f1da5d851b92aeb81dbbb9ebd516f6e2588f5 <
    85f438382a865a4dc4c50e6b884310bb2b60fc4d
  - >-
    Linux >= 1c8f1da5d851b92aeb81dbbb9ebd516f6e2588f5 <
    320e5258a53af0abc5abd9eb01519a48bab2dee8
  - >-
    Linux >= 1c8f1da5d851b92aeb81dbbb9ebd516f6e2588f5 <
    a7100601aa1a39f799a566acce10db20eaf4b7f2
  - Linux 4.15
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-16T19:22:51.998964Z'
published: '2026-09-11'
updated: '2026-10-19'
sourceUpdated: '2026-10-19T08:48:01.638Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-89510'
references:
  - 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'
  - 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
tags:
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.00176
epssPercentile: 0.07082
scores:
  cna: 7.8
  vendor: 7
ingestedAt: '2026-09-14T15:23:07.452Z'
---

## Overview

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

RDMA/cxgb4: Cancel reg_work before freeing device on remove

c4iw_uld_state_change() queues reg_work to register the RDMA device.
c4iw_remove() can free ctx->dev while this work is pending or running,
leaving c4iw_register_device() accessing the freed device.

Cancel reg_work before removing the device.  The registration work can
tear down ctx->dev when registration fails, so do not unregister or
deallocate it again in that case.

This issue was found by an in-house static analysis tool.

## Affected

- `Linux >= 1c8f1da5d851b92aeb81dbbb9ebd516f6e2588f5 < e6e79e7be87c5ea92728060a3d7fb56890a91e45`
- `Linux >= 1c8f1da5d851b92aeb81dbbb9ebd516f6e2588f5 < 672ee1981db10569ec96030bddb322f18382ec04`
- `Linux >= 1c8f1da5d851b92aeb81dbbb9ebd516f6e2588f5 < 4681e731db07769846901cfabdd3e53f765eb9d3`
- `Linux >= 1c8f1da5d851b92aeb81dbbb9ebd516f6e2588f5 < 3265d558dfafab8f12f5fba06ebbf15cae9f3225`
- `Linux >= 1c8f1da5d851b92aeb81dbbb9ebd516f6e2588f5 < fe9c591026c576d8b1f72aab5e4cd67350530763`
- `Linux >= 1c8f1da5d851b92aeb81dbbb9ebd516f6e2588f5 < 85f438382a865a4dc4c50e6b884310bb2b60fc4d`
- `Linux >= 1c8f1da5d851b92aeb81dbbb9ebd516f6e2588f5 < 320e5258a53af0abc5abd9eb01519a48bab2dee8`
- `Linux >= 1c8f1da5d851b92aeb81dbbb9ebd516f6e2588f5 < a7100601aa1a39f799a566acce10db20eaf4b7f2`
- `Linux 4.15`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## 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)