---
id: CVE-2026-89749
title: 'tracing: Fix crash passing ERR_PTR to kthread_stop()'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  tracing: Fix crash passing ERR_PTR to kthread_stop()

  event_test_stuff() calls kthread_run() and unconditionally passes the
  returned task_struct pointer to kthread_stop…
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-476
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= e6187007d6c365b551c69ea3df46f06fd1c8bd19 <
    c1a4fb7aa290f158d50654d640292e49d9055fd1
  - >-
    Linux >= e6187007d6c365b551c69ea3df46f06fd1c8bd19 <
    42ccb215ef0a552acbbd32f81009bfe4b278ba77
  - >-
    Linux >= e6187007d6c365b551c69ea3df46f06fd1c8bd19 <
    98d06fb9865a490e12ebe32d65b9ffac6108614d
  - >-
    Linux >= e6187007d6c365b551c69ea3df46f06fd1c8bd19 <
    ceb1707aef5824cf024eb82d10787b7621e2ff35
  - >-
    Linux >= e6187007d6c365b551c69ea3df46f06fd1c8bd19 <
    12a499f741fc5be3731c8b0a0d909406575cc2eb
  - >-
    Linux >= e6187007d6c365b551c69ea3df46f06fd1c8bd19 <
    adadf4192f700bca82abfda9fa6d58c0bf37cc04
  - >-
    Linux >= e6187007d6c365b551c69ea3df46f06fd1c8bd19 <
    c40e0b4fa365969e67011529eabdfb66d1022256
  - >-
    Linux >= e6187007d6c365b551c69ea3df46f06fd1c8bd19 <
    649bc7df3e5d7be6f7996a95084037dbf3cad1e5
  - Linux 2.6.31
published: '2026-09-11'
updated: '2026-10-19'
sourceUpdated: '2026-10-19T08:52:03.128Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-89749'
references:
  - url: 'https://git.kernel.org/stable/c/c1a4fb7aa290f158d50654d640292e49d9055fd1'
  - url: 'https://git.kernel.org/stable/c/42ccb215ef0a552acbbd32f81009bfe4b278ba77'
  - url: 'https://git.kernel.org/stable/c/98d06fb9865a490e12ebe32d65b9ffac6108614d'
  - url: 'https://git.kernel.org/stable/c/ceb1707aef5824cf024eb82d10787b7621e2ff35'
  - url: 'https://git.kernel.org/stable/c/12a499f741fc5be3731c8b0a0d909406575cc2eb'
  - url: 'https://git.kernel.org/stable/c/adadf4192f700bca82abfda9fa6d58c0bf37cc04'
  - url: 'https://git.kernel.org/stable/c/c40e0b4fa365969e67011529eabdfb66d1022256'
  - url: 'https://git.kernel.org/stable/c/649bc7df3e5d7be6f7996a95084037dbf3cad1e5'
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89749.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89749'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532518'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89749'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89749'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89749.mbox
tags:
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.00217
epssPercentile: 0.12082
ingestedAt: '2026-09-14T15:23:07.448Z'
---

## Overview

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

tracing: Fix crash passing ERR_PTR to kthread_stop()

event_test_stuff() calls kthread_run() and unconditionally passes the
returned task_struct pointer to kthread_stop(). kthread_run() returns an
error pointer such as ERR_PTR(-ENOMEM) when kthread creation fails, for
example under memory pressure during the boot-time event self-test.
kthread_stop() then dereferences the invalid pointer, crashing the kernel.

Check the result of kthread_run() before passing it to kthread_stop(). Use
WARN_ON() so that a failure to create the self-test thread does not go
unnoticed, matching the ring-buffer self-test fix in commit
91542863abad ("ring-buffer: Fix crash passing ERR_PTR to kthread_stop()").

## Affected

- `Linux >= e6187007d6c365b551c69ea3df46f06fd1c8bd19 < c1a4fb7aa290f158d50654d640292e49d9055fd1`
- `Linux >= e6187007d6c365b551c69ea3df46f06fd1c8bd19 < 42ccb215ef0a552acbbd32f81009bfe4b278ba77`
- `Linux >= e6187007d6c365b551c69ea3df46f06fd1c8bd19 < 98d06fb9865a490e12ebe32d65b9ffac6108614d`
- `Linux >= e6187007d6c365b551c69ea3df46f06fd1c8bd19 < ceb1707aef5824cf024eb82d10787b7621e2ff35`
- `Linux >= e6187007d6c365b551c69ea3df46f06fd1c8bd19 < 12a499f741fc5be3731c8b0a0d909406575cc2eb`
- `Linux >= e6187007d6c365b551c69ea3df46f06fd1c8bd19 < adadf4192f700bca82abfda9fa6d58c0bf37cc04`
- `Linux >= e6187007d6c365b551c69ea3df46f06fd1c8bd19 < c40e0b4fa365969e67011529eabdfb66d1022256`
- `Linux >= e6187007d6c365b551c69ea3df46f06fd1c8bd19 < 649bc7df3e5d7be6f7996a95084037dbf3cad1e5`
- `Linux 2.6.31`

## Remediation

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

## Vendor advisories

- **Red Hat VEX** · Low · 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 2026-10-17 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89749.json)