{ "schema_version": "1.6.1", "id": "RPI-CVE-2026-89744", "modified": "2026-10-09T11:39:44Z", "upstream": [ "CVE-2026-89744" ], "published": "2026-09-11T19:47:07Z", "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 \u250c\u2500> fwnode_get_next_child_node(FWa, FWa1)\n \u2502 - fwnode_call_ptr_op(FWa, get_next_child_node, FWa1) returns FWa2\n \u2502\n \u2502 ...\n \u2502\n \u2502 fwnode_get_next_child_node(FWa, FWa3)\n \u2502 - fwnode_call_ptr_op(FWa, get_next_child_node, FWa3) returns NULL\n \u2502 - fwnode_call_ptr_op(FWb, get_next_child_node, FWa3) returns FWb1\n \u2502\n \u2502 fwnode_get_next_child_node(FWa, FWb1)\n \u2502 - fwnode_call_ptr_op(FWa, get_next_child_node, FWb1) returns FWa1\n \u2514\u2500\u2500\u2500\u2500\u2518\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()\").", "severity": [ { "type": "CVSS_V3", "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H" } ], "affected": [ { "package": { "ecosystem": "Raspberry Pi OS:12", "name": "linux" }, "versions": [ "1:6.12.87-1+rpt1~bookworm", "1:6.12.93-1+rpt1", "1:6.12.96-1+rpt1" ], "ecosystem_specific": { "binaries": [ { "binary_name": "linux-image-6.12.87+rpt-rpi-2712", "binary_version": "1:6.12.87-1+rpt1~bookworm" }, { "binary_name": "linux-image-6.12.87+rpt-rpi-v6", "binary_version": "1:6.12.87-1+rpt1~bookworm" }, { "binary_name": "linux-image-6.12.87+rpt-rpi-v7", "binary_version": "1:6.12.87-1+rpt1~bookworm" }, { "binary_name": "linux-image-6.12.87+rpt-rpi-v7l", "binary_version": "1:6.12.87-1+rpt1~bookworm" }, { "binary_name": "linux-image-6.12.87+rpt-rpi-v8", "binary_version": "1:6.12.87-1+rpt1~bookworm" }, { "binary_name": "linux-image-6.12.87+rpt-rpi-v8-rt", "binary_version": "1:6.12.87-1+rpt1~bookworm" }, { "binary_name": "linux-image-6.12.93+rpt-rpi-2712", "binary_version": "1:6.12.93-1+rpt1" }, { "binary_name": "linux-image-6.12.93+rpt-rpi-v6", "binary_version": "1:6.12.93-1+rpt1" }, { "binary_name": "linux-image-6.12.93+rpt-rpi-v7", "binary_version": "1:6.12.93-1+rpt1" }, { "binary_name": "linux-image-6.12.93+rpt-rpi-v7l", "binary_version": "1:6.12.93-1+rpt1" }, { "binary_name": "linux-image-6.12.93+rpt-rpi-v8", "binary_version": "1:6.12.93-1+rpt1" }, { "binary_name": "linux-image-6.12.93+rpt-rpi-v8-rt", "binary_version": "1:6.12.93-1+rpt1" }, { "binary_name": "linux-image-6.12.96+rpt-rpi-2712", "binary_version": "1:6.12.96-1+rpt1" }, { "binary_name": "linux-image-6.12.96+rpt-rpi-v6", "binary_version": "1:6.12.96-1+rpt1" }, { "binary_name": "linux-image-6.12.96+rpt-rpi-v7", "binary_version": "1:6.12.96-1+rpt1" }, { "binary_name": "linux-image-6.12.96+rpt-rpi-v7l", "binary_version": "1:6.12.96-1+rpt1" }, { "binary_name": "linux-image-6.12.96+rpt-rpi-v8", "binary_version": "1:6.12.96-1+rpt1" }, { "binary_name": "linux-image-6.12.96+rpt-rpi-v8-rt", "binary_version": "1:6.12.96-1+rpt1" } ] }, "database_specific": { "per_version": { "1:6.12.87-1+rpt1~bookworm": { "linux_commit": "ae4d75fb36deba0fe1a986d9bfae65755e082dd0", "upstream_version": "6.12.87", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.12.109" }, "1:6.12.93-1+rpt1": { "linux_commit": "d8ab4e908235da7727f22dd36ad5af224671677d", "upstream_version": "6.12.93", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.12.109" }, "1:6.12.96-1+rpt1": { "linux_commit": "ae161617d7a4552fa91d03626b8d9f3696d17481", "upstream_version": "6.12.96", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.12.109" } } } }, { "package": { "ecosystem": "Raspberry Pi OS:13", "name": "linux" }, "versions": [ "1:6.18.29-1+rpt1", "1:6.18.33-1+rpt1", "1:6.18.34-1+rpt1", "1:6.18.39-1+rpt1" ], "ecosystem_specific": { "binaries": [ { "binary_name": "linux-image-6.18.29+rpt-rpi-2712", "binary_version": "1:6.18.29-1+rpt1" }, { "binary_name": "linux-image-6.18.29+rpt-rpi-v6", "binary_version": "1:6.18.29-1+rpt1" }, { "binary_name": "linux-image-6.18.29+rpt-rpi-v7", "binary_version": "1:6.18.29-1+rpt1" }, { "binary_name": "linux-image-6.18.29+rpt-rpi-v8", "binary_version": "1:6.18.29-1+rpt1" }, { "binary_name": "linux-image-6.18.29+rpt-rpi-v8-rt", "binary_version": "1:6.18.29-1+rpt1" }, { "binary_name": "linux-image-6.18.33+rpt-rpi-2712", "binary_version": "1:6.18.33-1+rpt1" }, { "binary_name": "linux-image-6.18.33+rpt-rpi-v6", "binary_version": "1:6.18.33-1+rpt1" }, { "binary_name": "linux-image-6.18.33+rpt-rpi-v7", "binary_version": "1:6.18.33-1+rpt1" }, { "binary_name": "linux-image-6.18.33+rpt-rpi-v8", "binary_version": "1:6.18.33-1+rpt1" }, { "binary_name": "linux-image-6.18.33+rpt-rpi-v8-rt", "binary_version": "1:6.18.33-1+rpt1" }, { "binary_name": "linux-image-6.18.34+rpt-rpi-2712", "binary_version": "1:6.18.34-1+rpt1" }, { "binary_name": "linux-image-6.18.34+rpt-rpi-v6", "binary_version": "1:6.18.34-1+rpt1" }, { "binary_name": "linux-image-6.18.34+rpt-rpi-v7", "binary_version": "1:6.18.34-1+rpt1" }, { "binary_name": "linux-image-6.18.34+rpt-rpi-v8", "binary_version": "1:6.18.34-1+rpt1" }, { "binary_name": "linux-image-6.18.34+rpt-rpi-v8-rt", "binary_version": "1:6.18.34-1+rpt1" }, { "binary_name": "linux-image-6.18.39+rpt-rpi-2712", "binary_version": "1:6.18.39-1+rpt1" }, { "binary_name": "linux-image-6.18.39+rpt-rpi-v6", "binary_version": "1:6.18.39-1+rpt1" }, { "binary_name": "linux-image-6.18.39+rpt-rpi-v7", "binary_version": "1:6.18.39-1+rpt1" }, { "binary_name": "linux-image-6.18.39+rpt-rpi-v8", "binary_version": "1:6.18.39-1+rpt1" }, { "binary_name": "linux-image-6.18.39+rpt-rpi-v8-rt", "binary_version": "1:6.18.39-1+rpt1" } ] }, "database_specific": { "per_version": { "1:6.18.29-1+rpt1": { "linux_commit": "66318c5b5cd8145a662303af12ed39ac07eb27cc", "upstream_version": "6.18.29", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.18.50" }, "1:6.18.33-1+rpt1": { "linux_commit": "95b85bebbedcaedfa7ca79116ed38b7376fba412", "upstream_version": "6.18.33", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.18.50" }, "1:6.18.34-1+rpt1": { "linux_commit": "c8c7494100e99ee05b11aaa4f0588a223a63d1af", "upstream_version": "6.18.34", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.18.50" }, "1:6.18.39-1+rpt1": { "linux_commit": "60ea684a8ace97bb0db1a16e20753bdd6ab371ff", "upstream_version": "6.18.39", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.18.50" } } } } ], "references": [ { "type": "ADVISORY", "url": "https://www.cve.org/CVERecord?id=CVE-2026-89744" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/04004fa33730031392d987a9c1bbd8a0e1c4794b" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/f4ae79b5f00130aacaddb1f3eb2e5ef711fbf9e0" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/20ed517e416df89448029293304c9e180c26cd4b" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/ba69d892ff4e4a58cc12a2cae106b112db3306cc" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/9cb6b223ef02cb5c9777a852ae1ecf5796987eb6" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/1900692555826753adab8799a1a8d50bb1ee200c" } ], "database_specific": { "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git", "upstream_modified": "2026-09-14T12:06:03Z", "severity": { "source": "kernel CNA", "cvss_v3_score": 8.4, "cvss_v3_severity": "High", "scenario": "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." } } }