---
id: CVE-2023-6240
title: >-
  Kernel: marvin vulnerability side-channel leakage in the rsa decryption
  operation
summary: >-
  A Marvin vulnerability side-channel leakage was found in the RSA decryption
  operation in the Linux Kernel. This issue may allow a network attacker to
  decrypt ciphertexts or forge signatures, limiting the services that use that
  private key.
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N'
cvssSource: cna
cwe:
  - CWE-203
vendor: Red Hat
product: kernel-rt
affected:
  - kernel-rt (all versions)
  - kernel (all versions)
  - kernel (all versions)
  - kernel (all versions)
  - kernel (all versions)
  - kernel-rt (all versions)
  - kernel (all versions)
  - kernel-rt (all versions)
  - kernel
  - kernel
  - kernel-rt
  - kernel-rt (all versions)
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2024-11-07T21:11:40.911308Z'
exploitAvailable: true
published: '2024-02-04'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T11:36:51.130Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2023-6240'
references:
  - url: 'https://access.redhat.com/errata/RHSA-2024:1881'
    label: 'RHSA-2024:1881'
  - url: 'https://access.redhat.com/errata/RHSA-2024:1882'
    label: 'RHSA-2024:1882'
  - url: 'https://access.redhat.com/errata/RHSA-2024:2758'
    label: 'RHSA-2024:2758'
  - url: 'https://access.redhat.com/errata/RHSA-2024:3414'
    label: 'RHSA-2024:3414'
  - url: 'https://access.redhat.com/errata/RHSA-2024:3421'
    label: 'RHSA-2024:3421'
  - url: 'https://access.redhat.com/errata/RHSA-2024:3618'
    label: 'RHSA-2024:3618'
  - url: 'https://access.redhat.com/errata/RHSA-2024:3627'
    label: 'RHSA-2024:3627'
  - url: 'https://access.redhat.com/security/cve/CVE-2023-6240'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2250843'
    label: RHBZ#2250843
  - url: 'https://people.redhat.com/~hkario/marvin/'
  - url: >-
      https://securitypitfalls.wordpress.com/2023/10/16/experiment-with-side-channel-attacks-yourself/
tags:
  - cve.org
  - exploit-available
epss: 0.00969
epssPercentile: 0.61957
ingestedAt: '2026-11-05T21:36:00.805Z'
---

## Overview

A Marvin vulnerability side-channel leakage was found in the RSA decryption operation in the Linux Kernel. This issue may allow a network attacker to decrypt ciphertexts or forge signatures, limiting the services that use that private key.

## Affected

- `kernel-rt (all versions)`
- `kernel (all versions)`
- `kernel (all versions)`
- `kernel (all versions)`
- `kernel (all versions)`
- `kernel-rt (all versions)`
- `kernel (all versions)`
- `kernel-rt (all versions)`
- `kernel`
- `kernel`
- `kernel-rt`
- `kernel-rt (all versions)`

## Remediation

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