Bug 2482133 (CVE-2026-45989)

Summary: CVE-2026-45989 kernel: of: unittest: fix use-after-free in testdrv_probe()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: ---
Doc Text:
A flaw was found in the Linux kernel, specifically within the `testdrv_probe()` function. This vulnerability, known as a use-after-free, occurs because the system prematurely releases a memory reference and then attempts to access that freed memory. This can be triggered by a local user, potentially leading to system instability, crashes, or in certain situations, allowing an attacker to execute unauthorized code.
 Story Points: ---
Clone Of: Environment:
Last Closed: Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-05-27 15:12:54 UTC 
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.
Comment 1 Keith Grant 2026-05-27 21:55:32 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026052739-CVE-2026-45989-b32d@gregkh/T