CVE-2026-68461 (GCVE-0-2026-68461)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:51 – Updated: 2026-08-17 05:39
VLAI
Title
device property: initialize the remaining fields of fwnode_handle in fwnode_init()
Summary
In the Linux kernel, the following vulnerability has been resolved: device property: initialize the remaining fields of fwnode_handle in fwnode_init() If a firmware node is allocated on the stack (for instance: temporary software node whose life-time we control) or on the heap - but using a non-zeroing allocation function - and initialized using fwnode_init(), its secondary pointer will contain uninitialized memory which likely will be neither NULL nor IS_ERR() and so may end up being dereferenced (for example: in dev_to_swnode()). Set fwnode->secondary to NULL on initialization. While at it: initialize the remaining fields of struct fwnode_handle too just to be sure. [ Fix typo in commit message. - Danilo ]
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 01bb86b380a306bd937c96da36f66429f3362137 , < 0198d579948322cda5178b9672d448375a32f947 (git)
Affected: 01bb86b380a306bd937c96da36f66429f3362137 , < 173b61c9276c7b3a5fbcc63ae7aafc897fee1e18 (git)
Affected: 01bb86b380a306bd937c96da36f66429f3362137 , < f0b4e1cc8ad76baf49d898727eb52e91a4ef0544 (git)
Affected: 01bb86b380a306bd937c96da36f66429f3362137 , < c8542b68ba6ef4f61072098893a3f5b71c569b6c (git)
Affected: 01bb86b380a306bd937c96da36f66429f3362137 , < 9c86a1f930bb2ddb85f867b4736716e82a4a4683 (git)
Affected: 01bb86b380a306bd937c96da36f66429f3362137 , < c81e2af41de6a159837c7129a4fc444ac6e48046 (git)
Affected: 01bb86b380a306bd937c96da36f66429f3362137 , < 7eba000621fff223dd7bab484d48918c7c77a307 (git)
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Linux Linux Affected: 5.11
Unaffected: 0 , < 5.11 (semver)
Unaffected: 5.15.212 , ≤ 5.15.* (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.96 , ≤ 6.12.* (semver)
Unaffected: 6.18.39 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "include/linux/fwnode.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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              "status": "affected",
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              "version": "6.6.145",
              "versionType": "semver"
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              "versionType": "original_commit_for_fix"
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      ],
      "cpeApplicability": [
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          "nodes": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndevice property: initialize the remaining fields of fwnode_handle in fwnode_init()\n\nIf a firmware node is allocated on the stack (for instance: temporary\nsoftware node whose life-time we control) or on the heap - but using a\nnon-zeroing allocation function - and initialized using fwnode_init(),\nits secondary pointer will contain uninitialized memory which likely\nwill be neither NULL nor IS_ERR() and so may end up being dereferenced\n(for example: in dev_to_swnode()). Set fwnode-\u003esecondary to NULL on\ninitialization. While at it: initialize the remaining fields of struct\nfwnode_handle too just to be sure.\n\n[ Fix typo in commit message. - Danilo ]"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The flaw is in fwnode_init() in the driver-core firmware-node layer; uninitialized fwnode-\u003esecondary is consumed in dev_to_swnode() and fwnode_property_*() during local device probe, property lookups, and configfs-driven gpio-sim/gpio-virtuser software-node creation\u2014never from a network packet or remote protocol handler.\nAC:L - Once a fwnode_handle is placed in non-zeroed stack or kmalloc storage and passed through fwnode_init(), the uninitialized secondary pointer is deterministically non-NULL and non-IS_ERR(), and property helpers immediately pass it to fwnode_call_*_op() without further validation\u2014no race, heap grooming, or victim timing is required.\nPR:L - No init-namespace root is required to reach the dereference paths: fwnode_property_present() and dev_to_swnode() run during automatic driver probe/bind and consumer property resolution (GPIO/IIO/reset/v4l2-fwnode) that a local unprivileged user can trigger by opening device nodes or causing driver binding on embedded/Android systems using software nodes.\nUI:N - The garbage secondary pointer is dereferenced automatically inside kernel property lookups and dev_to_swnode() during probe or device registration; no separate victim action such as mounting media, clicking a prompt, or opening a malicious file is needed beyond the affected driver path executing.\nS:U - Impact is confined to kernel memory corruption and crashes within the host kernel\u0027s own security authority during firmware-node property handling; it does not cross VM, IOMMU, container, or sandbox boundaries.\nC:H - An uninitialized secondary is treated as a live fwnode_handle pointer; fwnode_call_bool_op()/fwnode_call_int_op() evaluate fwnode-\u003eops on attacker-influenced stack or slab residue, reading kernel memory through misinterpreted ops tables rather than a bounded disclosure.\nI:H - The same garbage secondary is passed into fwnode_call_*_op() and set_secondary_fwnode()/fwnode_is_primary() logic; a non-NULL, non-ERR value with plausible ops and list-head residue enables indirect calls and list manipulation\u2014control-flow-relevant memory corruption per CNA guidance for uninitialized pointer use in fwnode plumbing.\nA:H - Dereferencing an uninitialized secondary in dev_to_swnode() or fwnode_property_*() causes an immediate kernel oops/panic from a bad pointer or invalid ops dispatch; the fault is repeatable whenever the affected fwnode initialization path is exercised."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:39:08.142Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/0198d579948322cda5178b9672d448375a32f947"
        },
        {
          "url": "https://git.kernel.org/stable/c/173b61c9276c7b3a5fbcc63ae7aafc897fee1e18"
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          "url": "https://git.kernel.org/stable/c/f0b4e1cc8ad76baf49d898727eb52e91a4ef0544"
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        },
        {
          "url": "https://git.kernel.org/stable/c/7eba000621fff223dd7bab484d48918c7c77a307"
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      "title": "device property: initialize the remaining fields of fwnode_handle in fwnode_init()",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-68461",
    "datePublished": "2026-08-15T05:51:21.219Z",
    "dateReserved": "2026-07-30T09:28:09.395Z",
    "dateUpdated": "2026-08-17T05:39:08.142Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
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      "date": "2026-09-23",
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndevice property: initialize the remaining fields of fwnode_handle in fwnode_init()\n\nIf a firmware node is allocated on the stack (for instance: temporary\nsoftware node whose life-time we control) or on the heap - but using a\nnon-zeroing allocation function - and initialized using fwnode_init(),\nits secondary pointer will contain uninitialized memory which likely\nwill be neither NULL nor IS_ERR() and so may end up being dereferenced\n(for example: in dev_to_swnode()). Set fwnode-\u003esecondary to NULL on\ninitialization. While at it: initialize the remaining fields of struct\nfwnode_handle too just to be sure.\n\n[ Fix typo in commit message. - Danilo ]"
          }
        ],
        "id": "CVE-2026-68461",
        "lastModified": "2026-08-17T06:17:55.380",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
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              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
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        "published": "2026-08-15T06:18:34.113",
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/0198d579948322cda5178b9672d448375a32f947"
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          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-17T15:00:03+00:00",
      "cve": "CVE-2026-68461",
      "id": "CVE-2026-68461",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "246",
      "product_status:known_not_affected": "28",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: device property: initialize the remaining fields of fwnode_handle in fwnode_init()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68461.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-15T01:33:18Z",
      "cve": "CVE-2026-68461",
      "id": "CVE-2026-68461",
      "initial_release_date": "2026-08-26T01:15:40Z",
      "product_status:known_affected": "219",
      "product_status:known_not_affected": "143",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-68461",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-68461.json",
      "version": "4"
    }
  }
}



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