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CVE-2026-45989

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: of: unittest: fix use-after-free in testdrv_probe() The function testdrv_probe() retrieves the device_node from the PCI device,…

Published May 27, 2026CWE-416EPSS 0.17%

Overview

CVE-2026-45989 is a high-severity vulnerability. It was published on May 27, 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:

of: unittest: fix use-after-free in testdrv_probe()

The function testdrv_probe() retrieves the device_node from the PCI

device, applies an overlay, and then immediately calls of_node_put(dn).

This releases the reference held by the PCI core, potentially freeing

the node if the reference count drops to zero. Later, the same freed

pointer 'dn' is passed to of_platform_default_populate(), leading to a

use-after-free.

The reference to pdev->dev.of_node is owned by the device model and

should not be released by the driver. Remove the erroneous of_node_put()

to prevent premature freeing.

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/07fd339b2c253205794bea5d9b4b7548a4546c56Refgit.kernel.org/stable/c/0ba03e06f037df704d9b032e36d417633e2326bcRefgit.kernel.org/stable/c/5b6122a67a295f8a08b7c18d908a1bd974dfaec8Refgit.kernel.org/stable/c/6b2023286d2c6ed3bf964fb92e34c9c14d42eb69Refgit.kernel.org/stable/c/d68347b07b9801791c9eaab8f772770b52b8cd5c

How CyberStrike helps

Frequently asked questions

What is CVE-2026-45989?

CVE-2026-45989 is a high-severity vulnerability. It was published on May 27, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-45989?

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-2026-45989?

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-2026-45989?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-45989 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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