---
id: CVE-2026-98507
title: >-
  kernel: mm/rmap: fix missing barrier between anon_vma init and vma->anon_vma
  publish (CVE-2026-98507)
summary: >-
  A flaw was found in the Linux kernel's memory management subsystem. Due to a
  missing synchronization barrier when preparing anonymous virtual memory areas,
  concurrent memory operations can be reordered. A local attacker can exploit
  this ra…
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: vendor
cwe: CWE-416
vendor: Red Hat
product: Red Hat Enterprise Linux 9
affected:
  - enterprise_linux 10
  - enterprise_linux 6
  - enterprise_linux 7
  - enterprise_linux 8
  - enterprise_linux 9
  - openshift_container_platform 4
published: '2026-10-18'
updated: '2026-10-24'
sourceUpdated: '2026-10-24T14:27:54+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98507.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98507.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-98507'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2554843'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-98507'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-98507'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98507.mbox
  - url: 'https://kernelcve.org/list/?q=CVE-2026-98507'
  - url: 'https://git.kernel.org/stable/c/465e222815c8839445d09028fa4c77e70f7f1c7d'
  - url: 'https://git.kernel.org/stable/c/a500df43cde075f6ea4b8bae495d89f2c35b3e16'
  - url: 'https://git.kernel.org/stable/c/4cef512a955e4008ae4436a4fc97726976df1fdf'
  - url: 'https://git.kernel.org/stable/c/d348a715380bfcc6a611bdf722169d53fd01e735'
  - url: 'https://git.kernel.org/stable/c/b6ac0b3f6013c168f22cad97e79967accacb08e1'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
  - score-dispute
epss: 0.00164
epssPercentile: 0.05568
scores:
  vendor: 4.7
  cna: 7.8
ingestedAt: '2026-10-18T15:45:12.286Z'
---

## Overview

A flaw was found in the Linux kernel's memory management subsystem. Due to a missing synchronization barrier when preparing anonymous virtual memory areas, concurrent memory operations can be reordered. A local attacker can exploit this race condition by running concurrent threads on adjacent memory regions, causing lock mismatches or improper memory reuse. This flaw primarily results in a kernel hang or deadlock, causing a Denial of Service (DoS).

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, … · updated 2026-10-24 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98507.json)

**kernel: mm/rmap: fix missing barrier between anon_vma init and vma->anon_vma publish** — rated Moderate by Red Hat. Released 2026-10-18, updated 2026-10-24.

Affected:

- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4

No fix planned:

- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4

## Remediation

Out of support scope

Workarounds / mitigations:

- 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.