---
id: CVE-2026-62840
title: >-
  Time-of-check time-of-use (toctou) race condition in Linux Kernel allows an
  authorized attacker to elevate privileges locally.
summary: >-
  Time-of-check time-of-use (toctou) race condition in Linux Kernel allows an
  authorized attacker to elevate privileges locally.
severity: high
cvss: 7
cvssVector: 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-367
vendor: Microsoft
product: Linux 3P (Third Party) Distros
affected:
  - linux_3p_third_party_distros >= 1.0.0 < 7.3
  - linux_kernel_-_microsoft_mana_network_driver -
published: '2026-10-13'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T14:17:25.377'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-62840'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62840'
    label: secure@microsoft.com
tags:
  - nvd
  - cve.org
epss: 0.00207
epssPercentile: 0.10697
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-13T21:10:34.499119Z'
ingestedAt: '2026-10-13T21:58:14.181Z'
---

## Overview

Time-of-check time-of-use (toctou) race condition in Linux Kernel allows an authorized attacker to elevate privileges locally.

## Remediation

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