---
id: CVE-2026-89548
title: >-
  kernel: SUNRPC: always drain cache_cleaner before destroying a cache_detail
  (CVE-2026-89548)
summary: >-
  A flaw was found in the Linux kernel's SUNRPC component. When
  `sunrpc_destroy_cache_detail()` is called, it may not properly drain the
  `cache_cleaner` before freeing a `cache_detail` object. This oversight can
  lead to a use-after-free vuln…
severity: high
cvss: 7
cvssVector: 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H'
cvssSource: vendor
cwe: CWE-825
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: '2026-09-11'
updated: '2026-09-15'
sourceUpdated: '2026-09-15T14:05:47+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89548.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89548.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89548'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532450'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89548'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89548'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89548.mbox
  - url: 'https://git.kernel.org/stable/c/dec787a15c96a5665e9ffc61b429a6a4ab26e6b9'
  - url: 'https://git.kernel.org/stable/c/5eea874a696201c31e7c2d7badbfa0d90e9961b5'
  - url: 'https://git.kernel.org/stable/c/cf239de7fdcc8336259b01ea4bcf650dadad1040'
  - url: 'https://git.kernel.org/stable/c/6d74ecc2be120a0c300b224b7649fe93c0453714'
  - url: 'https://git.kernel.org/stable/c/9d44836f60c8c29bcdb1471fd9202387c642a890'
  - url: 'https://git.kernel.org/stable/c/2e861ce2aaa468351a6a47c4cbb4971ebb740c7b'
  - url: 'https://git.kernel.org/stable/c/3d60fdf951143d6ef4e352e2f8eb852286701726'
  - url: 'https://git.kernel.org/stable/c/f42d0fda0c67695db6bc704b04b7c10240805377'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
epss: 0.00171
epssPercentile: 0.05665
scores:
  vendor: 7
  cna: 7.8
ingestedAt: '2026-09-14T15:23:07.452Z'
---

## Overview

A flaw was found in the Linux kernel's SUNRPC component. When `sunrpc_destroy_cache_detail()` is called, it may not properly drain the `cache_cleaner` before freeing a `cache_detail` object. This oversight can lead to a use-after-free vulnerability, where the system attempts to access or use memory that has already been deallocated. A local attacker could potentially exploit this to cause a denial of service or achieve privilege escalation.

## 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 2026-09-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89548.json)

**kernel: SUNRPC: always drain cache_cleaner before destroying a cache_detail** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-15.

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