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CVE PROGRAM SOURCE RECORD8.4 High

CVE-2026-89744

device property: fix infinite loop in fwnode_for_each_child_node()

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Status
Published
Published
Updated
Assigning organization
Linux

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

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • d1370a4f2aa0d811d419f6a6c6d257867d608956 to < 45a8fc4a12751833ed3868095d18200a85336760affected
  • 5b51b2ba5207e07bcd7be0daab2f8eea405e005e to < 770c9bde93c8bb644f590743e9fbae3492a20f9eaffected
  • 272fcf19fda14ec603ce915aafc56cb3ea2fb38d to < 04004fa33730031392d987a9c1bbd8a0e1c4794baffected
  • 3cfdf8d27b668d122a67a14bf2bcde1a7f10bbd6 to < f4ae79b5f00130aacaddb1f3eb2e5ef711fbf9e0affected
  • 64dc258f9eec1d7204e9879cb836fe29967f1239 to < 20ed517e416df89448029293304c9e180c26cd4baffected
  • 32752c3e81498b106da64a141379eb94f493fe6f to < ba69d892ff4e4a58cc12a2cae106b112db3306ccaffected
  • 2692c614f8f05929d692b3dbfd3faef1f00fbaf0 to < 9cb6b223ef02cb5c9777a852ae1ecf5796987eb6affected
  • 2692c614f8f05929d692b3dbfd3faef1f00fbaf0 to < 1900692555826753adab8799a1a8d50bb1ee200caffected
  • 43a621684ffa47fc008be98b15ff7becaf3a72faaffected
  • 5.10.253 to < 5.10.273affected
  • 5.15.203 to < 5.15.224affected
  • 6.1.167 to < 6.1.188affected
  • 6.6.130 to < 6.6.157affected
  • 6.12.78 to < 6.12.109affected
  • 6.18.19 to < 6.18.50affected
  • 6.19.9 to < 6.20affected

Linux Linux

Default version status: affected

  • 7.0affected
  • 0 to < 7.0unaffected
  • 5.10.273 to ≤ 5.10.*unaffected
  • 5.15.224 to ≤ 5.15.*unaffected
  • 6.1.188 to ≤ 6.1.*unaffected
  • 6.6.157 to ≤ 6.6.*unaffected
  • 6.12.109 to ≤ 6.12.*unaffected
  • 6.18.50 to ≤ 6.18.*unaffected
  • 7.2.4 to ≤ 7.2.*unaffected
  • 7.3 to ≤ *unaffected

References