device property: fix infinite loop in fwnode_for_each_child_node()
Key facts
- Attack vector
- Local
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Partial Red Hat: 3 without a fix
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat.
Summary
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()").
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Linux | Linux | 5.10.253 to before 5.10.273; 5.15.203 to before 5.15.224; 6.1.167 to before 6.1.188; 6.6.130 to before 6.6.157; 6.12.78 to before 6.12.109; 6.18.19 to before 6.18.50; 6.19.9 to before 6.20 | 5.10.273, 5.15.224, 6.1.188, 6.6.157, 6.12.109, 6.18.50, 6.20 | Patch available | CNA |
| Linux | Linux | 7.0 and later | 5.10.273, 5.15.224, 6.1.188, 6.6.157, 6.12.109, 6.18.50, 7.2.4, 7.3 | Patch available | CNA |
- Linux VendorLinux Affected 5.10.253 to before 5.10.273; 5.15.203 to before 5.15.224; 6.1.167 to before 6.1.188; 6.6.130 to before 6.6.157; 6.12.78 to before 6.12.109; 6.18.19 to before 6.18.50; 6.19.9 to before 6.20 Fixed in 5.10.273, 5.15.224, 6.1.188, 6.6.157, 6.12.109, 6.18.50, 6.20 Patch available CNA
- Linux VendorLinux Affected 7.0 and later Fixed in 5.10.273, 5.15.224, 6.1.188, 6.6.157, 6.12.109, 6.18.50, 7.2.4, 7.3 Patch available CNA
Remediation
- Fix · CNA Linux (Linux) Fixed in 5.10.273, 5.15.224, 6.1.188, 6.6.157, 6.12.109, 6.18.50, 6.20
- Fix · CNA Linux (Linux) Fixed in 5.10.273, 5.15.224, 6.1.188, 6.6.157, 6.12.109, 6.18.50, 7.2.4, 7.3
Vendor assessments
Red Hat
Red Hat rating: Low. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 10 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 9 | Affected | No fix yet: Fix deferred |
| Red Hat OpenShift Container Platform 5 | Affected | No fix yet: Fix deferred |
Not affected: 5 products
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4
Timeline
- 2026-10-02 Threatist record created from CVE-2026-89744
- 2026-10-03 Alias added: GHSA-m8jp-qpwv-wm5j
- 2026-10-19 Fix available: Linux/[email protected] · CNA
- 2026-10-29 Affected versions changed · Red Hat
- 2026-10-30 Fix available: Linux/Linux@45a8fc4a12751833ed3868095d18200a85336760, Linux/[email protected], Linux/[email protected] +1 · CNA
- 2026-10-30 2 new references · CNA
- 2026-10-30 Affected versions changed · Red Hat
References
Other 8
- https://git.kernel.org/stable/c/45a8fc4a12751833ed3868095d18200a85336760
- https://git.kernel.org/stable/c/770c9bde93c8bb644f590743e9fbae3492a20f9e
- https://git.kernel.org/stable/c/04004fa33730031392d987a9c1bbd8a0e1c4794b
- https://git.kernel.org/stable/c/f4ae79b5f00130aacaddb1f3eb2e5ef711fbf9e0
- https://git.kernel.org/stable/c/20ed517e416df89448029293304c9e180c26cd4b
- https://git.kernel.org/stable/c/ba69d892ff4e4a58cc12a2cae106b112db3306cc
- https://git.kernel.org/stable/c/9cb6b223ef02cb5c9777a852ae1ecf5796987eb6
- https://git.kernel.org/stable/c/1900692555826753adab8799a1a8d50bb1ee200c
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Sources
- CVE-2026-89744 · CVE Program
- CVE-2026-89744 · NVD
- FIRST EPSS
- GHSA-m8jp-qpwv-wm5j · GitHub Advisory Database · CC BY 4.0
- CVE-2026-89744 · Red Hat security data · CC BY 4.0
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