---
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: 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
  - 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: '2026-10-23'
sourceUpdated: '2026-10-23T04:06:19+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://kernelcve.org/list/?q=CVE-2026-89540'
  - 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: 0.00129
epssPercentile: 0.02546
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-16T19:23:23.496498Z'
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 2026-10-23 · [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 2026-10-23.

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.