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CVE-2026-89534

8.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: svcrdma: Clear sc_cm_id when ADDR_CHANGE replacement fails When svc_rdma_listen_handler() handles RDMA_CM_EVENT_ADDR_CHANGE, it…

Published Sep 11, 2026EPSS 0.24%

Overview

CVE-2026-89534 is a high-severity vulnerability. It was published on September 11, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical description

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

svcrdma: Clear sc_cm_id when ADDR_CHANGE replacement fails

When svc_rdma_listen_handler() handles RDMA_CM_EVENT_ADDR_CHANGE,

it creates a replacement listener cm_id and returns 1, telling

the CM core to destroy the old one. If the replacement allocation

fails, sc_cm_id still points at the old cm_id that the CM core is

about to destroy. Any subsequent dereference of sc_cm_id --

such as svc_rdma_detach()'s rdma_disconnect() call -- is a

use-after-free.

NULL sc_cm_id on the failure path and guard svc_rdma_detach()'s

rdma_disconnect() call against NULL so that the listener can

be torn down safely when the server shuts down.

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/01500306e1d50de7ca7a2cdcdfa28ac0523eb747Refgit.kernel.org/stable/c/2a68aeb2de8ad0fef9c50e73a50622a35c6af1a8Refgit.kernel.org/stable/c/65f0f82f20334e76acaf29087a59af7b3b9699edRefgit.kernel.org/stable/c/673e358ab7c11f8cec223c6a36a793056a67facd

How CyberStrike helps

Frequently asked questions

What is CVE-2026-89534?

CVE-2026-89534 is a high-severity vulnerability. It was published on September 11, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2026-89534?

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-89534?

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-2026-89534?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-89534 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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