{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-89744", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.762Z", "datePublished": "2026-09-11T19:46:50.020Z", "dateUpdated": "2026-10-19T08:51:58.192Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:51:58.192Z" }, "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()\")." } ], "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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/base/property.c" ], "versions": [ { "version": "272fcf19fda14ec603ce915aafc56cb3ea2fb38d", "lessThan": "04004fa33730031392d987a9c1bbd8a0e1c4794b", "status": "affected", "versionType": "git" }, { "version": "3cfdf8d27b668d122a67a14bf2bcde1a7f10bbd6", "lessThan": "f4ae79b5f00130aacaddb1f3eb2e5ef711fbf9e0", "status": "affected", "versionType": "git" }, { "version": "64dc258f9eec1d7204e9879cb836fe29967f1239", "lessThan": "20ed517e416df89448029293304c9e180c26cd4b", "status": "affected", "versionType": "git" }, { "version": "32752c3e81498b106da64a141379eb94f493fe6f", "lessThan": "ba69d892ff4e4a58cc12a2cae106b112db3306cc", "status": "affected", "versionType": "git" }, { "version": "2692c614f8f05929d692b3dbfd3faef1f00fbaf0", "lessThan": "9cb6b223ef02cb5c9777a852ae1ecf5796987eb6", "status": "affected", "versionType": "git" }, { "version": "2692c614f8f05929d692b3dbfd3faef1f00fbaf0", "lessThan": "1900692555826753adab8799a1a8d50bb1ee200c", "status": "affected", "versionType": "git" }, { "version": "d1370a4f2aa0d811d419f6a6c6d257867d608956", "status": "affected", "versionType": "git" }, { "version": "5b51b2ba5207e07bcd7be0daab2f8eea405e005e", "status": "affected", "versionType": "git" }, { "version": "43a621684ffa47fc008be98b15ff7becaf3a72fa", "status": "affected", "versionType": "git" }, { "version": "6.1.167", "lessThan": "6.1.188", "status": "affected", "versionType": "semver" }, { "version": "6.6.130", "lessThan": "6.6.157", "status": "affected", "versionType": "semver" }, { "version": "6.12.78", "lessThan": "6.12.109", "status": "affected", "versionType": "semver" }, { "version": "6.18.19", "lessThan": "6.18.50", "status": "affected", "versionType": "semver" }, { "version": "5.10.253", "lessThan": "5.11", "status": "affected", "versionType": "semver" }, { "version": "5.15.203", "lessThan": "5.16", "status": "affected", "versionType": "semver" }, { "version": "6.19.9", "lessThan": "6.20", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/base/property.c" ], "versions": [ { "version": "7.0", "status": "affected" }, { "version": "0", "lessThan": "7.0", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.188", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.157", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.109", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.50", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.4", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "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": "5.10.253" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15.203" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.19.9" } ] } ] } ], "references": [ { "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" } ], "title": "device property: fix infinite loop in fwnode_for_each_child_node()", "x_generator": { "engine": "bippy-1.2.0" } } } }