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CVE-2026-89545

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: sunrpc: defer rq_argp and rq_resp free until after RCU grace period svc_rqst_free() frees rqstp->rq_argp and rqstp->rq_resp syn…

Published Sep 11, 2026EPSS 0.16%

Overview

CVE-2026-89545 is a high-severity vulnerability. It was published on September 11, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

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

sunrpc: defer rq_argp and rq_resp free until after RCU grace period

svc_rqst_free() frees rqstp->rq_argp and rqstp->rq_resp synchronously

via kfree(), but defers the rqstp struct free via kfree_rcu(). After

svc_exit_thread() calls list_del_rcu() and svc_rqst_free(), there is

a window where RCU readers that started before list_del_rcu() can still

traverse the thread list and find the rqstp. These readers (e.g.

nfsd_nl_rpc_status_get_dumpit()) dereference rqstp->rq_argp, which has

already been freed — a use-after-free.

Fix this by moving the kfree of rq_argp and rq_resp into an explicit

call_rcu() callback alongside the struct free. Resources not accessed

by RCU readers (bvec, buffer pages, scratch folio, auth_data) remain

synchronously freed.

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/08bc49e0541260bf294962cf889a32a2d2713ad6Refgit.kernel.org/stable/c/0ea49d69aa806008b2424c8cf21cf746b9963967Refgit.kernel.org/stable/c/c479bde671cbe2f9e152834a8b0eb7c3c295bbafRefgit.kernel.org/stable/c/c977158237bccc3d2512d5b17c47ee3760dc8839Refgit.kernel.org/stable/c/e0c5693d3f9a5d4911735ab0e0eba4eecb1f1090

How CyberStrike helps

Frequently asked questions

What is CVE-2026-89545?

CVE-2026-89545 is a high-severity vulnerability. It was published on September 11, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-89545?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-89545?

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-2026-89545?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-89545 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.

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