---
id: CVE-2026-89540
title: 'kernel: sunrpc: init gssp_lock before publishing proc entry (CVE-2026-89540)'
summary: >-
  A flaw was found in the Linux kernel's sunrpc component. A race condition
  exists where the `gssp_lock` mutex is not initialized before its associated
  `/proc/net/rpc/use-gss-proxy` entry is published. This allows a local attacker
  to trigger…
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-909
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: '2026-09-15T18:29:36+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89540.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89540.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89540'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532132'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89540'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89540'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89540.mbox
  - url: 'https://git.kernel.org/stable/c/159a4fab7170badd6c4a553aef81cac079d6f4ee'
  - url: 'https://git.kernel.org/stable/c/b3526ae3351968f6726bcbe25d8d09973ad79109'
  - url: 'https://git.kernel.org/stable/c/7f5bcdc8da15077ebe846c2756a5a17741021410'
  - url: 'https://git.kernel.org/stable/c/89c8e0733e8c46b7973503f15b1b31a8587d8030'
  - url: 'https://git.kernel.org/stable/c/f15b87521168c2a92cb1931f532cba422f856f01'
  - url: 'https://git.kernel.org/stable/c/edeefb111d6181a4aa278f415b005efe284b9489'
  - url: 'https://git.kernel.org/stable/c/3f019571928b269feebcff59926ec13294215e0e'
  - url: 'https://git.kernel.org/stable/c/5ce1ed6159731a41fdd0b03eedbed4e147036a5a'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
epss: 0.00176
epssPercentile: 0.06306
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. A race condition exists where the `gssp_lock` mutex is not initialized before its associated `/proc/net/rpc/use-gss-proxy` entry is published. This allows a local attacker to trigger a scenario where multiple writers can concurrently access the `set_gssp_clnt()` function, leading to a denial of service for the first writer's client and a resource leak.

## 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-2026-89540.json)

**kernel: sunrpc: init gssp_lock before publishing proc entry** — 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