What is CVE-2026-45989?

CVE-2026-45989 is a unscored severity Linux kernel vulnerability, affecting Linux kernel versions from 6.6 onward and patched in 6.6.140, 6.12.86, 6.18.27 and others. CVE-2026-45989 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-45989?

CVE-2026-45989 has a CVSS score of pending NVD analysis out of 10, rated awaiting scoring severity.

Is there a patch available for CVE-2026-45989?

Yes, CVE-2026-45989 has been patched. Fixed versions include 6.6.140, 6.12.86, 6.18.27 and others. If you are running Linux kernel 6.6 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-45989 actively exploited?

CVE-2026-45989 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2026-45989

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.

Package Linux Kernel

Published 2026-05-27

Last modified 2026-05-27

Patch available

Yes

Affected versions

Linux kernel versions 6.6 and later are affected. Fixed in 6.6.140, 6.12.86, 6.18.27, 7.0.4, 7.1-rc1 and their respective stable series.

Affected from

≥ 6.6

Fixed in

✓ 6.6.140 6.6.x ✓ 6.12.86 6.12.x ✓ 6.18.27 6.18.x ✓ 7.0.4 7.0.x ✓ 7.1-rc1

References

The following references provide additional information about CVE-2026-45989 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

Kernel patch commit
https://git.kernel.org/stable/c/07fd339b2c253205794bea5d9b4b7548a4546c56
Patch
Kernel patch commit
https://git.kernel.org/stable/c/0ba03e06f037df704d9b032e36d417633e2326bc
Patch
Kernel patch commit
https://git.kernel.org/stable/c/5b6122a67a295f8a08b7c18d908a1bd974dfaec8
Patch

5 patch commits total View all on NVD

Frequently asked questions

What is CVE-2026-45989?

CVE-2026-45989 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 6.6 onward and has been patched in 6.6.140, 6.12.86, 6.18.27 and others. CVE-2026-45989 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
Is there a patch available for CVE-2026-45989?

Yes — CVE-2026-45989 has been patched. Fixed versions include 6.6.140, 6.12.86, 6.18.27 and others. If you are running Linux kernel 6.6 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-45989 actively exploited?

No — CVE-2026-45989 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.