# CVE-2026-89744

## Summary

- **CVE ID:** CVE-2026-89744
- **Severity:** HIGH
- **CVSS Score:** 8.4 (CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
- **CWE:** N/A
- **Published:** Sep 11, 2026
- **Last Modified:** Sep 14, 2026

## 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()").

## Affected Products

- Linux — Linux (64dc258f9eec1d7204e9879cb836fe29967f1239)
- Linux — Linux (32752c3e81498b106da64a141379eb94f493fe6f)
- Linux — Linux (2692c614f8f05929d692b3dbfd3faef1f00fbaf0)
- Linux — Linux (d1370a4f2aa0d811d419f6a6c6d257867d608956)
- Linux — Linux (5b51b2ba5207e07bcd7be0daab2f8eea405e005e)
- Linux — Linux (272fcf19fda14ec603ce915aafc56cb3ea2fb38d)
- Linux — Linux (3cfdf8d27b668d122a67a14bf2bcde1a7f10bbd6)
- Linux — Linux (43a621684ffa47fc008be98b15ff7becaf3a72fa)
- Linux — Linux (6.12.78)
- Linux — Linux (6.18.19)
- Linux — Linux (5.10.253)
- Linux — Linux (5.15.203)
- Linux — Linux (6.1.167)
- Linux — Linux (6.6.130)
- Linux — Linux (6.19.9)
- Linux — Linux (7.0)
- Linux — Linux (0)
- Linux — Linux (6.12.109)
- Linux — Linux (6.18.50)
- Linux — Linux (7.2.4)
- Linux — Linux (7.3-rc1)
- Linux — Linux (6.1.188)
- Linux — Linux (6.6.157)

## References

- [CNA](https://git.kernel.org/stable/c/20ed517e416df89448029293304c9e180c26cd4b)
- [CNA](https://git.kernel.org/stable/c/ba69d892ff4e4a58cc12a2cae106b112db3306cc)
- [CNA](https://git.kernel.org/stable/c/9cb6b223ef02cb5c9777a852ae1ecf5796987eb6)
- [CNA](https://git.kernel.org/stable/c/1900692555826753adab8799a1a8d50bb1ee200c)
- [CNA](https://git.kernel.org/stable/c/04004fa33730031392d987a9c1bbd8a0e1c4794b)
- [CNA](https://git.kernel.org/stable/c/f4ae79b5f00130aacaddb1f3eb2e5ef711fbf9e0)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.14%
- **EPSS Percentile:** 4.0

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-19._