---
id: CVE-2026-90135
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  net: add missing ref_tracker_dir_exit() to alloc_netdev_mqs()

  sashiko is reporting that trying to read /sys/kernel/debug/ref_tracker/*
  causes use-afer-free crash when …
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  net: add missing ref_tracker_dir_exit() to alloc_netdev_mqs()

  sashiko is reporting that trying to read /sys/kernel/debug/ref_tracker/*
  causes use-afer-free crash when …
severity: medium
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 4d92b95ff2f95f13df9bad0b5a25a9f60e72758d <
    2775bf36be7872834a7f8c0a0d9681a1a3e1cd4c
  - >-
    Linux >= 4d92b95ff2f95f13df9bad0b5a25a9f60e72758d <
    5fe03b5257095e2beef0bc79e1f068fbd09a24c7
  - >-
    Linux >= 4d92b95ff2f95f13df9bad0b5a25a9f60e72758d <
    63ab05e8f9654aa100d366c0236399fda6ffaab1
  - >-
    Linux >= 4d92b95ff2f95f13df9bad0b5a25a9f60e72758d <
    0b1c2af8a22c35cb099c735c2f63ea3ba757557d
  - Linux 5.17
published: '2026-09-17'
updated: '2026-09-17'
sourceUpdated: '2026-09-17T17:17:06.053'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-90135'
references:
  - url: 'https://git.kernel.org/stable/c/0b1c2af8a22c35cb099c735c2f63ea3ba757557d'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/2775bf36be7872834a7f8c0a0d9681a1a3e1cd4c'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/5fe03b5257095e2beef0bc79e1f068fbd09a24c7'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/63ab05e8f9654aa100d366c0236399fda6ffaab1'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/45be87c5195f34c0a51598bc91186f600be5c4c9'
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-90135.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-90135'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2536278'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-90135'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-90135'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-90135.mbox
  - url: 'https://kernelcve.org/list/?q=CVE-2026-90135'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
ingestedAt: '2026-09-17T16:21:47.879Z'
epss: 0.00201
epssPercentile: 0.09869
cvss: 4.7
cvssVector: 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H'
cvssSource: vendor
cwe:
  - CWE-416
---

## Overview

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

net: add missing ref_tracker_dir_exit() to alloc_netdev_mqs()

sashiko is reporting that trying to read /sys/kernel/debug/ref_tracker/*
causes use-afer-free crash when either alloc_percpu() or dev_addr_init()
in alloc_netdev_mqs() failed, for commit 4d92b95ff2f9 ("net: add net device
refcount tracker infrastructure") added ref_tracker_dir_exit() to only
free_netdev() path.

## 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 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-10-23 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-90135.json)