CVE-2026-89744

CVE Details

Release Date:	2026-09-11
Impact:	Low	What is this?

Description

In the Linux kernel, the following vulnerability has been resolved: device property: fix infinite loop in fwnode_for_each_child_node() When iterate over children of a fwnode that has a secondary fwnode, fwnode_get_next_child_node() can enter an infinite loop if the secondary fwnode has more than one child. Parent Child (Primary fwnode) FWa: {FWa1, FWa2, FWa3} (Secondary fwnode) FWb: {FWb1, FWb2} In this case: +-> fwnode_get_next_child_node(FWa, FWa1) | - fwnode_call_ptr_op(FWa, get_next_child_node, FWa1) returns FWa2 | | ... | | fwnode_get_next_child_node(FWa, FWa3) | - fwnode_call_ptr_op(FWa, get_next_child_node, FWa3) returns NULL | - fwnode_call_ptr_op(FWb, get_next_child_node, FWa3) returns FWb1 | | fwnode_get_next_child_node(FWa, FWb1) | - fwnode_call_ptr_op(FWa, get_next_child_node, FWb1) returns FWa1 +----+ This cause fwnode_for_each_child_node() to loop indefinitely, reapeatedly output {FWa1, FWa2, FWa3, FWb1, FWa1, ...}. The root cause is that when the current child (FWb1) belongs to the secondary fwnode, calling get_next_child_node() on the parimary fwnode incorrectly returns the first child (FWa1) again instead of NULL. Fix this by dynamically checking the parent fwnode of the current child before calling get_next_child_node(). This approach follows the pattern established in commit b5b41ab6b0c1 ("device property: Check fwnode->secondary in fwnode_graph_get_next_endpoint()").

See more information about CVE-2026-89744 from MITRE CVE dictionary and NIST NVD

NOTE: The following CVSS metrics and score provided are preliminary and subject to review.

CVSS v3 metrics

Base Score:	4.4
Vector String:	CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
Version:	3.1
Attack Vector:	Local
Attack Complexity:	Low
Privileges Required:	High
User Interaction:	None
Scope:	Unchanged
Confidentiality Impact:	None
Integrity Impact:	None
Availability Impact:	High

Errata information

Platform	Errata	Release Date
Oracle Linux version 9 (kernel-uek)	ELSA-2026-500374	2026-10-07