Linux Kernel NFS client Vulnerability Rated 8.1 CVSS

Last refreshed2026-10-15

Status: UPDATED | Advisory ID: CVE-2026-89709

Key Details

CVE	CVE-2026-89709
CVSS Score / Version	8.1 (High) / CVSS v3.1
Updated	2026-10-15
CVSS Vector	`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H`
CVSS Prose	attack vector is network; attack complexity is high; privileges required is none; user interaction is none; scope is unchanged; confidentiality impact is high; integrity impact is high; availability impact is high.
Affected products	Linux Kernel
Exploitation prediction (EPSS)	0.45% probability of exploitation in the next 30 days (38% percentile) -- FIRST.org's EPSS model.

Vendor	Product	Affected Versions	Patch Status
Linux	Linux Kernel

Vendor

Product

Affected Versions

Patch Status

Linux

Linux Kernel

Subsystems	OT Supporting Infrastructure
Sectors	All Sectors

In the Linux kernel, the following vulnerability has been resolved:

lockd, nfsd: RCU-protect nlmsvc_ops dispatch

nlmsvc_ops is published by nfsd_lockd_init() and cleared by

nfsd_lockd_shutdown() with plain stores, while lockd dereferences

it unguarded from dispatch sites in fs/lockd/svcsubs.c. The pointer

targets nfsd's .rodata and the fopen/fclose callbacks live in nfsd's

.text, so a stale load after rmmod nfsd results in either a NULL

deref or a module-text use-after-free.

Declare nlmsvc_ops as __rcu, publish via rcu_assign_pointer(), clear

via RCU_INIT_POINTER() + synchronize_rcu(). Add a struct module

*owner field to nlmsvc_binding and pin the module across indirect

calls with try_module_get/module_put. When the binding is torn down,

fall back to fput() to avoid leaking struct file references. (NVD)

Monitor Linux's web page for any future patch releases.

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-89709
CVE	https://www.cve.org/CVERecord?id=CVE-2026-89709

Source

Reference

NVD

CVE