CVE-2026-45989
Published May 27, 2026
Modified May 27, 2026
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.
References
Other References
https://git.kernel.org/stable/c/07fd339b2c253205794bea5d9b4b7548a4546c56
https://git.kernel.org/stable/c/0ba03e06f037df704d9b032e36d417633e2326bc
https://git.kernel.org/stable/c/5b6122a67a295f8a08b7c18d908a1bd974dfaec8
https://git.kernel.org/stable/c/6b2023286d2c6ed3bf964fb92e34c9c14d42eb69
https://git.kernel.org/stable/c/d68347b07b9801791c9eaab8f772770b52b8cd5c
Frequently Asked Questions
What is 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.
How do I check if I'm vulnerable to CVE-2026-45989? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.