---
id: CVE-2026-64226
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  sched_ext: Avoid UAF in scx_root_enable_workfn() init failure path

  In scx_root_enable_workfn(), put_task_struct(p) is called before scx_error()
  dereferences p->comm an…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  sched_ext: Avoid UAF in scx_root_enable_workfn() init failure path

  In scx_root_enable_workfn(), put_task_struct(p) is called before scx_error()
  dereferences p->comm an…
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'
published: '2026-07-24'
updated: '2026-07-27'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-64226'
references:
  - url: 'https://git.kernel.org/stable/c/45c7c4e3db8b700307313c035ea08be829a7f21b'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/57e19ba3f58a67eb924022a5a60b67fd08e5cbbd'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/9a415cc53711f2238e0f0ca8a6bcc796c003b127'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/cf396941901858b0de426cdcd3974eea6a02c98c'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
epss: 0.00175
epssPercentile: 0.06156
ingestedAt: '2026-07-27T06:16:49.264Z'
---

## Overview

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

sched_ext: Avoid UAF in scx_root_enable_workfn() init failure path

In scx_root_enable_workfn(), put_task_struct(p) is called before scx_error()
dereferences p->comm and p->pid. If the iterator's reference is the last
drop, the task is freed synchronously and the deref becomes a UAF.

Move put_task_struct() past scx_error().

## Remediation

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