CVE-2026-89744 (GCVE-0-2026-89744)
Vulnerability from cvelistv5
Published
2026-09-11 19:46
Modified
2026-10-30 12:32
Severity ?
8.4 (High) - CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
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()").
References
Impacted products
Vendor Product Version
Linux Linux Version: d1370a4f2aa0d811d419f6a6c6d257867d608956
Version: 5b51b2ba5207e07bcd7be0daab2f8eea405e005e
Version: 272fcf19fda14ec603ce915aafc56cb3ea2fb38d
Version: 3cfdf8d27b668d122a67a14bf2bcde1a7f10bbd6
Version: 64dc258f9eec1d7204e9879cb836fe29967f1239
Version: 32752c3e81498b106da64a141379eb94f493fe6f
Version: 2692c614f8f05929d692b3dbfd3faef1f00fbaf0
Version: 2692c614f8f05929d692b3dbfd3faef1f00fbaf0
Version: 43a621684ffa47fc008be98b15ff7becaf3a72fa
Version: 5.10.253   ≤
Version: 5.15.203   ≤
Version: 6.1.167   ≤
Version: 6.6.130   ≤
Version: 6.12.78   ≤
Version: 6.18.19   ≤
Version: 6.19.9   ≤
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      "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 \u250c\u2500\u003e 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-\u003esecondary in fwnode_graph_get_next_endpoint()\")."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.4,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "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\u0027s 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": {
        "dateUpdated": "2026-10-30T12:32:54.954Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "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"
        }
      ],
      "title": "device property: fix infinite loop in fwnode_for_each_child_node()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89744",
    "datePublished": "2026-09-11T19:46:50.020Z",
    "dateReserved": "2026-09-11T19:38:34.762Z",
    "dateUpdated": "2026-10-30T12:32:54.954Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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