---
id: CVE-2026-89752
title: >-
  kernel: mm: memcg: stop reclaim when a limit update is superseded
  (CVE-2026-89752)
summary: >-
  A flaw was found in the Linux kernel's memory cgroup (memcg) component. When
  multiple file operations concurrently update `memory.high` or `memory.max`
  files in `kernfs`, a writer can continue reclaiming memory towards an outdated
  target. …
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cvssSource: vendor
cwe: CWE-367
vendor: Red Hat
product: Red Hat Enterprise Linux 9
affected:
  - enterprise_linux 10
  - enterprise_linux 6
  - enterprise_linux 8
  - enterprise_linux 9
  - openshift_container_platform 4
published: '2026-09-11'
updated: '2026-09-21'
sourceUpdated: '2026-09-21T17:37:51+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89752.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89752.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89752'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532245'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89752'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89752'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89752.mbox
  - url: 'https://git.kernel.org/stable/c/39ec1e4183a718f448b2e9de681dcbdda18fce42'
  - url: 'https://git.kernel.org/stable/c/9477820c63cbf4d97114238f3d1ff10dfd6bee3f'
  - url: 'https://git.kernel.org/stable/c/95d87030cae7764805aa7c621c52871139297cb0'
  - url: 'https://git.kernel.org/stable/c/aab391074de96ed601eeca32daef9a8507d436d9'
  - url: 'https://git.kernel.org/stable/c/ebf762a393630d1582645be3f0fc22a674eb9122'
  - url: 'https://git.kernel.org/stable/c/4ea0617b9e46d26c0a3e5af00308ea1931cc545d'
  - url: 'https://git.kernel.org/stable/c/5c6f87d33733d96fba66ea4e78cd8b24b4d60a49'
  - url: 'https://git.kernel.org/stable/c/8bf21ad3657305e28deafd9ef16a121407496bc3'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
epss: 0.00176
epssPercentile: 0.07442
ingestedAt: '2026-09-14T15:23:07.448Z'
---

## Overview

A flaw was found in the Linux kernel's memory cgroup (memcg) component. When multiple file operations concurrently update `memory.high` or `memory.max` files in `kernfs`, a writer can continue reclaiming memory towards an outdated target. This can lead to an indefinite loop, causing a denial of service (DoS) by blocking the writer and repeatedly incrementing the Out-Of-Memory (OOM) event counter without terminating processes.

## Vendor advisories

- **Red Hat VEX** · Low · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, 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 8, Red Hat Enterprise Linux 9, … · updated 2026-09-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89752.json)

**kernel: mm: memcg: stop reclaim when a limit update is superseded** — rated Low by Red Hat. Released 2026-09-11, updated 2026-09-21.

Affected:

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

Not affected:

- Red Hat Enterprise Linux 7

## Remediation

Out of support scope