---
id: CVE-2021-4204
title: >-
  An out-of-bounds (OOB) memory access flaw was found in the Linux kernel's eBPF
  due to an Improper Input Validation
summary: >-
  An out-of-bounds (OOB) memory access flaw was found in the Linux kernel's eBPF
  due to an Improper Input Validation. This flaw allows a local attacker with a
  special privilege to crash the system or leak internal information.
severity: none
cwe:
  - CWE-20
product: kernel
affected:
  - kernel Affects Linux kernel v5.8 or later
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-08T21:05:08.422710Z'
exploitAvailable: true
published: '2022-08-24'
updated: '2026-11-02'
sourceUpdated: '2026-11-02T18:11:10.668Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2021-4204'
references:
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2039178'
  - url: 'https://access.redhat.com/security/cve/CVE-2021-4204'
  - url: 'https://www.openwall.com/lists/oss-security/2022/01/11/4'
  - url: 'https://security-tracker.debian.org/tracker/CVE-2021-4204'
  - url: 'https://security.netapp.com/advisory/ntap-20221228-0003/'
tags:
  - cve.org
  - exploit-available
epss: 0.01245
epssPercentile: 0.69375
exploits:
  github: 1
  githubRepos:
    - 'https://github.com/tr3ee/CVE-2021-4204'
  checkedAt: '2026-11-05T19:31:18.369Z'
ingestedAt: '2026-11-05T19:30:42.768Z'
---

## Overview

An out-of-bounds (OOB) memory access flaw was found in the Linux kernel's eBPF due to an Improper Input Validation. This flaw allows a local attacker with a special privilege to crash the system or leak internal information.

## Affected

- `kernel Affects Linux kernel v5.8 or later`

## Remediation

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