---
id: CVE-2023-3567
title: 'Kernel: use after free in vcs_read in drivers/tty/vt/vc_screen.c due to race'
summary: >-
  A use-after-free flaw was found in vcs_read in drivers/tty/vt/vc_screen.c in
  vc_screen in the Linux Kernel. This issue may allow an attacker with local
  user access to cause a system crash or leak internal kernel information.
severity: high
cvss: 7.1
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H'
cvssSource: cna
cwe:
  - CWE-416
vendor: Red Hat
product: kernel-rt
affected:
  - kernel-rt (all versions)
  - kernel (all versions)
  - kernel (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 (all versions)
  - kernel
  - kernel
  - kernel-rt
  - kernel-rt (all versions)
published: '2023-07-24'
updated: '2026-11-07'
sourceUpdated: '2026-11-07T11:32:43.084Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2023-3567'
references:
  - url: 'https://access.redhat.com/errata/RHSA-2024:0412'
    label: 'RHSA-2024:0412'
  - url: 'https://access.redhat.com/errata/RHSA-2024:0431'
    label: 'RHSA-2024:0431'
  - url: 'https://access.redhat.com/errata/RHSA-2024:0432'
    label: 'RHSA-2024:0432'
  - url: 'https://access.redhat.com/errata/RHSA-2024:0439'
    label: 'RHSA-2024:0439'
  - url: 'https://access.redhat.com/errata/RHSA-2024:0448'
    label: 'RHSA-2024:0448'
  - url: 'https://access.redhat.com/errata/RHSA-2024:0575'
    label: 'RHSA-2024:0575'
  - url: 'https://access.redhat.com/errata/RHSA-2024:2394'
    label: 'RHSA-2024:2394'
  - url: 'https://access.redhat.com/errata/RHSA-2024:2950'
    label: 'RHSA-2024:2950'
  - url: 'https://access.redhat.com/errata/RHSA-2024:3138'
    label: 'RHSA-2024:3138'
  - url: 'https://access.redhat.com/security/cve/CVE-2023-3567'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2221463'
    label: RHBZ#2221463
  - url: 'https://www.spinics.net/lists/stable-commits/msg285184.html'
tags:
  - cve.org
epss: 0.00419
epssPercentile: 0.3648
ingestedAt: '2026-11-07T12:16:41.111Z'
---

## Overview

A use-after-free flaw was found in vcs_read in drivers/tty/vt/vc_screen.c in vc_screen in the Linux Kernel. This issue may allow an attacker with local user access to cause a system crash or leak internal kernel information.

## Affected

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

## Remediation

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

### Workarounds

Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.