Go to homepageCyberStrike

Menu

Star on GitHub · 3.4k
Sign inDownload

CVE-2026-89709

8.1 · HIGH

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()…

Published Sep 11, 2026EPSS 0.59%

Overview

CVE-2026-89709 is a high-severity vulnerability. It was published on September 11, 2026 and has a CVSS 3.1 base score of 8.1 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/3c461a1820088fb5889d73a6522369bde45527a9Refgit.kernel.org/stable/c/43943532c105ea8fe26039a1347cfda4ac0fcadcRefgit.kernel.org/stable/c/641e5e20852359b8c31149be4598884e30652f60Refgit.kernel.org/stable/c/6e7495972039f212e336e552b58cac9dd54611c3Refgit.kernel.org/stable/c/836ce2b99bcce6d68c58edd04efbc5cd1fd581afRefgit.kernel.org/stable/c/cc2f0d79b21be69b891cbd1899daf2a1fdf9df87

How CyberStrike helps

Frequently asked questions

What is CVE-2026-89709?

CVE-2026-89709 is a high-severity vulnerability. It was published on September 11, 2026 and has a CVSS 3.1 base score of 8.1 (HIGH).

How severe is CVE-2026-89709?

This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-89709?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-89709?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-89709 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

Related HIGH CVEs from 2026

View all
Browse by year2026202520242023202220212020201920182017201620152014201320122011201020092008200720062005200420032002200120001999
LiveWatch live →