{"id":"CVE-2026-89744","state":"PUBLISHED","title":"device property: fix infinite loop in fwnode_for_each_child_node()","description":"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()\").","publishedAt":"2026-09-11T19:46:50.020Z","updatedAt":"2026-10-30T12:32:54.954Z","severity":{"score":8.4,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"d1370a4f2aa0d811d419f6a6c6d257867d608956","status":"affected","lessThan":"45a8fc4a12751833ed3868095d18200a85336760","versionType":"git"},{"version":"5b51b2ba5207e07bcd7be0daab2f8eea405e005e","status":"affected","lessThan":"770c9bde93c8bb644f590743e9fbae3492a20f9e","versionType":"git"},{"version":"272fcf19fda14ec603ce915aafc56cb3ea2fb38d","status":"affected","lessThan":"04004fa33730031392d987a9c1bbd8a0e1c4794b","versionType":"git"},{"version":"3cfdf8d27b668d122a67a14bf2bcde1a7f10bbd6","status":"affected","lessThan":"f4ae79b5f00130aacaddb1f3eb2e5ef711fbf9e0","versionType":"git"},{"version":"64dc258f9eec1d7204e9879cb836fe29967f1239","status":"affected","lessThan":"20ed517e416df89448029293304c9e180c26cd4b","versionType":"git"},{"version":"32752c3e81498b106da64a141379eb94f493fe6f","status":"affected","lessThan":"ba69d892ff4e4a58cc12a2cae106b112db3306cc","versionType":"git"},{"version":"2692c614f8f05929d692b3dbfd3faef1f00fbaf0","status":"affected","lessThan":"9cb6b223ef02cb5c9777a852ae1ecf5796987eb6","versionType":"git"},{"version":"2692c614f8f05929d692b3dbfd3faef1f00fbaf0","status":"affected","lessThan":"1900692555826753adab8799a1a8d50bb1ee200c","versionType":"git"},{"version":"43a621684ffa47fc008be98b15ff7becaf3a72fa","status":"affected","versionType":"git"},{"version":"5.10.253","status":"affected","lessThan":"5.10.273","versionType":"semver"},{"version":"5.15.203","status":"affected","lessThan":"5.15.224","versionType":"semver"},{"version":"6.1.167","status":"affected","lessThan":"6.1.188","versionType":"semver"},{"version":"6.6.130","status":"affected","lessThan":"6.6.157","versionType":"semver"},{"version":"6.12.78","status":"affected","lessThan":"6.12.109","versionType":"semver"},{"version":"6.18.19","status":"affected","lessThan":"6.18.50","versionType":"semver"},{"version":"6.19.9","status":"affected","lessThan":"6.20","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/base/property.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"7.0","status":"affected"},{"version":"0","status":"unaffected","lessThan":"7.0","versionType":"semver"},{"version":"5.10.273","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.224","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.188","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.157","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.109","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.50","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.4","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/base/property.c"]}],"references":["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"],"weaknesses":[],"ingestedAt":"2026-10-30T12:52:04.348Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/89xxx/CVE-2026-89744.json","commit":"1f312381e38164a43607eebab851b151dd16861e","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-89744","state":"PUBLISHED","datePublished":"2026-09-11T19:46:50.020Z","dateUpdated":"2026-10-30T12:32:54.954Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-11T19:38:34.762Z"},"containers":{"cna":{"title":"device property: fix infinite loop in fwnode_for_each_child_node()","descriptions":[{"lang":"en","value":"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()\")."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"d1370a4f2aa0d811d419f6a6c6d257867d608956","status":"affected","lessThan":"45a8fc4a12751833ed3868095d18200a85336760","versionType":"git"},{"version":"5b51b2ba5207e07bcd7be0daab2f8eea405e005e","status":"affected","lessThan":"770c9bde93c8bb644f590743e9fbae3492a20f9e","versionType":"git"},{"version":"272fcf19fda14ec603ce915aafc56cb3ea2fb38d","status":"affected","lessThan":"04004fa33730031392d987a9c1bbd8a0e1c4794b","versionType":"git"},{"version":"3cfdf8d27b668d122a67a14bf2bcde1a7f10bbd6","status":"affected","lessThan":"f4ae79b5f00130aacaddb1f3eb2e5ef711fbf9e0","versionType":"git"},{"version":"64dc258f9eec1d7204e9879cb836fe29967f1239","status":"affected","lessThan":"20ed517e416df89448029293304c9e180c26cd4b","versionType":"git"},{"version":"32752c3e81498b106da64a141379eb94f493fe6f","status":"affected","lessThan":"ba69d892ff4e4a58cc12a2cae106b112db3306cc","versionType":"git"},{"version":"2692c614f8f05929d692b3dbfd3faef1f00fbaf0","status":"affected","lessThan":"9cb6b223ef02cb5c9777a852ae1ecf5796987eb6","versionType":"git"},{"version":"2692c614f8f05929d692b3dbfd3faef1f00fbaf0","status":"affected","lessThan":"1900692555826753adab8799a1a8d50bb1ee200c","versionType":"git"},{"version":"43a621684ffa47fc008be98b15ff7becaf3a72fa","status":"affected","versionType":"git"},{"version":"5.10.253","status":"affected","lessThan":"5.10.273","versionType":"semver"},{"version":"5.15.203","status":"affected","lessThan":"5.15.224","versionType":"semver"},{"version":"6.1.167","status":"affected","lessThan":"6.1.188","versionType":"semver"},{"version":"6.6.130","status":"affected","lessThan":"6.6.157","versionType":"semver"},{"version":"6.12.78","status":"affected","lessThan":"6.12.109","versionType":"semver"},{"version":"6.18.19","status":"affected","lessThan":"6.18.50","versionType":"semver"},{"version":"6.19.9","status":"affected","lessThan":"6.20","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/base/property.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"7.0","status":"affected"},{"version":"0","status":"unaffected","lessThan":"7.0","versionType":"semver"},{"version":"5.10.273","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.224","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.188","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.157","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.109","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.50","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.4","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/base/property.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/45a8fc4a12751833ed3868095d18200a85336760"},{"url":"https://git.kernel.org/stable/c/770c9bde93c8bb644f590743e9fbae3492a20f9e"},{"url":"https://git.kernel.org/stable/c/04004fa33730031392d987a9c1bbd8a0e1c4794b"},{"url":"https://git.kernel.org/stable/c/f4ae79b5f00130aacaddb1f3eb2e5ef711fbf9e0"},{"url":"https://git.kernel.org/stable/c/20ed517e416df89448029293304c9e180c26cd4b"},{"url":"https://git.kernel.org/stable/c/ba69d892ff4e4a58cc12a2cae106b112db3306cc"},{"url":"https://git.kernel.org/stable/c/9cb6b223ef02cb5c9777a852ae1ecf5796987eb6"},{"url":"https://git.kernel.org/stable/c/1900692555826753adab8799a1a8d50bb1ee200c"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":8.4,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - fwnode_get_next_child_node() is reached from local driver-core fw_devlink and device_for_each_child_node() during device_add/bind/probe (GPIO, LEDs, IIO, MFD, camera), not from network or remote protocol parsing.\nAC:L - On OF platforms whose primary node has children and a secondary software node also has children, of_get_next_available_child() treats a non-OF child as prev=NULL and restarts at the first OF child, so the loop is deterministic with no race or layout dependency.\nPR:N - No capability or credential check exists on this path; fw_devlink_parse_fwtree()/fw_devlink_pickup_dangling_consumers() and driver probe walk mixed primary/secondary children automatically at boot and hotplug bind on phones, embedded boards, and Galileo GPIO.\nUI:N - Firmware-node child walks run inside kernel device registration, fw_devlink, and driver probe without any victim action such as mounting a filesystem or opening a user-supplied file.\nS:U - The hang and firmware-node use-after-free stay inside the host kernel's device-property/OF layer and do not cross a VM, IOMMU, or sandbox boundary.\nC:H - Crossing from the last OF child into the secondary node makes software_node_get_next_child() put an already-dropped OF node, underflowing its refcount and freeing it while sibling iteration continues, a use-after-free of firmware-node memory.\nI:H - The extra put leaves the last primary child freed but still linked in the OF sibling list; the next of_get_next_available_child() follows that dangling sibling into freed device_node memory, enabling heap-spray write and control-flow hijack.\nA:H - fwnode_for_each_child_node() spins forever in probe/fw_devlink process context, causing a soft lockup or hung task, and the OF-node use-after-free can also oops or panic the host."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:32:54.954Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10.253","versionEndExcluding":"5.10.273"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15.203","versionEndExcluding":"5.15.224"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1.167","versionEndExcluding":"6.1.188"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6.130","versionEndExcluding":"6.6.157"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.12.78","versionEndExcluding":"6.12.109"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.18.19","versionEndExcluding":"6.18.50"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"7.0","versionEndExcluding":"7.2.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"7.0","versionEndExcluding":"7.3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.19.9"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}