---
id: CVE-2023-4732
title: >-
  Kernel: race between task migrating pages and another task calling exit_mmap
  to release those same pages getting invalid opcode bug in
  include/linux/swapops.h
summary: >-
  A flaw was found in pfn_swap_entry_to_page in memory management subsystem in
  the Linux Kernel. In this flaw, an attacker with a local user privilege may
  cause a denial of service problem due to a BUG statement referencing pmd_t x.
severity: medium
cvss: 4.7
cvssVector: 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H'
cvssSource: cna
cwe:
  - CWE-366
vendor: Red Hat
product: kernel-rt
affected:
  - kernel-rt (all versions)
  - kernel (all versions)
  - kernel (all versions)
  - kernel (all versions)
  - kernel (all versions)
  - kernel
  - kernel
  - kernel-rt
  - kernel
  - kernel-rt
published: '2023-10-03'
updated: '2026-11-07'
sourceUpdated: '2026-11-07T13:41:48.890Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2023-4732'
references:
  - url: 'https://access.redhat.com/errata/RHSA-2023:6901'
    label: 'RHSA-2023:6901'
  - url: 'https://access.redhat.com/errata/RHSA-2023:7077'
    label: 'RHSA-2023:7077'
  - url: 'https://access.redhat.com/errata/RHSA-2023:7539'
    label: 'RHSA-2023:7539'
  - url: 'https://access.redhat.com/errata/RHSA-2024:0412'
    label: 'RHSA-2024:0412'
  - url: 'https://access.redhat.com/security/cve/CVE-2023-4732'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2236982'
    label: RHBZ#2236982
tags:
  - cve.org
epss: 0.00183
epssPercentile: 0.07934
ingestedAt: '2026-11-07T14:18:21.468Z'
---

## Overview

A flaw was found in pfn_swap_entry_to_page in memory management subsystem in the Linux Kernel. In this flaw, an attacker with a local user privilege may cause a denial of service problem due to a BUG statement referencing pmd_t x.

## Affected

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

## Remediation

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

### Workarounds

A possible workaround is disabling Transparent Hugepage