{"id":"CVE-2026-89744","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-89744","summary":"device property: fix infinite loop in fwnode_for_each_child_node()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ndevice property: fix infinite loop in fwnode_for_each_child_node()\n\nWhen iterate over children of a fwnode that has a secondary fwnode,\nfwnode_get_next_child_node() can enter an infinite loop if the secondary\nfwnode has more than one child.\n\n                       Parent        Child\n      (Primary fwnode)   FWa:   {FWa1, FWa2, FWa3}\n    (Secondary fwnode)   FWb:   {FWb1, FWb2}\n\nIn this case:\n\n ┌─> fwnode_get_next_child_node(FWa, FWa1)\n │    - fwnode_call_ptr_op(FWa, get_next_child_node, FWa1) returns FWa2\n │\n │   ...\n │\n │   fwnode_get_next_child_node(FWa, FWa3)\n │    - fwnode_call_ptr_op(FWa, get_next_child_node, FWa3) returns NULL\n │    - fwnode_call_ptr_op(FWb, get_next_child_node, FWa3) returns FWb1\n │\n │   fwnode_get_next_child_node(FWa, FWb1)\n │    - fwnode_call_ptr_op(FWa, get_next_child_node, FWb1) returns FWa1\n └────┘\n\nThis cause fwnode_for_each_child_node() to loop indefinitely, reapeatedly\noutput {FWa1, FWa2, FWa3, FWb1, FWa1, ...}.\n\nThe root cause is that when the current child (FWb1) belongs to the\nsecondary fwnode, calling get_next_child_node() on the parimary fwnode\nincorrectly returns the first child (FWa1) again instead of NULL.\n\nFix this by dynamically checking the parent fwnode of the current child\nbefore calling get_next_child_node(). This approach follows the pattern\nestablished in commit b5b41ab6b0c1 (\"device property: Check\nfwnode->secondary in fwnode_graph_get_next_endpoint()\").","published":"2026-09-11T19:46:50.020Z","modified":"2026-09-14T03:46:29.565410801Z","cvss":{"score":8.4,"severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"Linux","name":"Kernel","fixedVersion":"6.12.109"}],"fix":null,"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/1900692555826753adab8799a1a8d50bb1ee200c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/20ed517e416df89448029293304c9e180c26cd4b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9cb6b223ef02cb5c9777a852ae1ecf5796987eb6"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ba69d892ff4e4a58cc12a2cae106b112db3306cc"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89744.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89744"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-14T03:46:29.565410801Z"}}