---
id: CVE-2026-98217
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  IB/mlx4: Fix use-after-free on pkey sysfs registration failure

  register_pkey_tree() ignores errors from register_one_pkey_tree() and
  continues registering the remainin…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  IB/mlx4: Fix use-after-free on pkey sysfs registration failure

  register_pkey_tree() ignores errors from register_one_pkey_tree() and
  continues registering the remainin…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= c1e7e466120b80ce49e91af0c9da1ce6dee4844a <
    791471421d848ce13e84f4b21c9e19973d471c4e
  - >-
    Linux >= c1e7e466120b80ce49e91af0c9da1ce6dee4844a <
    734f066933484f6c7cedea0312763249beed5845
  - >-
    Linux >= c1e7e466120b80ce49e91af0c9da1ce6dee4844a <
    a07bee32127d7c4cd3b1bb9a088e21d0c93634c9
  - >-
    Linux >= c1e7e466120b80ce49e91af0c9da1ce6dee4844a <
    cf20d7476754c00eec04ae23d3e929de33ce0345
  - >-
    Linux >= c1e7e466120b80ce49e91af0c9da1ce6dee4844a <
    0c3482e965b18bc242e54e899d1c4d391ca8e5e3
  - >-
    Linux >= c1e7e466120b80ce49e91af0c9da1ce6dee4844a <
    ffb80872617b5f9b3dd1536ec2909029fa66f228
  - >-
    Linux >= c1e7e466120b80ce49e91af0c9da1ce6dee4844a <
    ced1186fea7c77e16681c7ef4802897885989c3b
  - >-
    Linux >= c1e7e466120b80ce49e91af0c9da1ce6dee4844a <
    1af874e9f4ce22ccf8b10ab5462f32c70d3be21a
  - Linux 3.7
published: '2026-10-06'
updated: '2026-10-06'
sourceUpdated: '2026-10-06T09:18:08.423'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-98217'
references:
  - url: 'https://git.kernel.org/stable/c/0c3482e965b18bc242e54e899d1c4d391ca8e5e3'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/1af874e9f4ce22ccf8b10ab5462f32c70d3be21a'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/734f066933484f6c7cedea0312763249beed5845'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/791471421d848ce13e84f4b21c9e19973d471c4e'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/a07bee32127d7c4cd3b1bb9a088e21d0c93634c9'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/ced1186fea7c77e16681c7ef4802897885989c3b'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/cf20d7476754c00eec04ae23d3e929de33ce0345'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/ffb80872617b5f9b3dd1536ec2909029fa66f228'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-10-06T08:50:17.441Z'
---

## Overview

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

IB/mlx4: Fix use-after-free on pkey sysfs registration failure

register_pkey_tree() ignores errors from register_one_pkey_tree() and
continues registering the remaining slaves. The per-slave error path has
already released the pkey parent kobjects, but their pointers remain
stored in the device. A later device cleanup therefore passes the stale
pointers to kobject_put(), causing a use-after-free.

Clear the parent pointers after releasing a failed slave tree and skip
unregistered trees during device cleanup. This preserves the existing
best-effort registration behavior while preventing a second cleanup of
the failed tree.

## Remediation

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