---
id: CVE-2026-53020
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  um: Fix potential race condition in TLB sync

  During the TLB sync, we need to traverse and modify the page table,
  so we should hold the page table lock
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  um: Fix potential race condition in TLB sync

  During the TLB sync, we need to traverse and modify the page table,
  so we should hold the page table lock. Since full SMP …
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: '2026-06-24'
updated: '2026-07-10'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-53020'
references:
  - url: 'https://git.kernel.org/stable/c/102331b66bcaf1f41f50b9c4cd5c36e46bafa9f3'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/f21c343ec7419377bff89ab11146c03ae117036f'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
epss: 0.00127
epssPercentile: 0.02026
ingestedAt: '2026-07-11T19:15:11.858Z'
---

## Overview

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

um: Fix potential race condition in TLB sync

During the TLB sync, we need to traverse and modify the page table,
so we should hold the page table lock. Since full SMP support for
threads within the same process is still missing, let's disable the
split page table lock for simplicity.

## Remediation

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