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net: phy: micrel: always set shared->phydev for LAN8814

Type: advisorySources: OSV

In the Linux kernel, the following vulnerability has been resolved: net: phy: micrel: always set shared->phydev for LAN8814 Currently, during the LAN8814 PTP probe shared->phydev is only set if PTP clock gets actually set, otherwise the function will return before setting it. This is an issue as shared->phydev is unconditionally being used when IRQ is being handled, especially in lan8814_gpio_process_cap and since it was not set it will cause a NULL pointer exception and crash the kernel. So, simply always set shared->phydev to avoid the NULL pointer exception.

Products
Kernel
Affected versions
Not specified
Fixed versions
6.12.56, 6.17.6
CVEs
CVE-2025-40239
Confirmed fixed CVEs
Not specified
Updated in this feed
7 Nov 2026, 10:56 UTC · Revision 1

Source evidence

net: phy: micrel: always set shared->phydev for LAN8814

core-osv · Original source

Published 4 Dec 2025, 15:31 UTC

In the Linux kernel, the following vulnerability has been resolved: net: phy: micrel: always set shared->phydev for LAN8814 Currently, during the LAN8814 PTP probe shared->phydev is only set if PTP clock gets actually set, otherwise the function will return before setting it. This is an issue as shared->phydev is unconditionally being used when IRQ is being handled, especially in lan8814_gpio_process_cap and since it was not set it will cause a NULL pointer exception and crash the kernel. So, simply always set shared->phydev to avoid the NULL pointer exception.

osv:CVE-2025-40239

Kernel

Fixed versions: 6.12.56, 6.17.6

Complete source record
{
  "id": "43d9e547f6152728bb29df0bcf616c8318edf9d22ece558491b4b8cf5f6c0875",
  "url": "https://osv.dev/vulnerability/CVE-2025-40239",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "net: phy: micrel: always set shared->phydev for LAN8814",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: net: phy: micrel: always set shared->phydev for LAN8814 Currently, during the LAN8814 PTP probe shared->phydev is only set if PTP clock gets actually set, otherwise the function will return before setting it. This is an issue as shared->phydev is unconditionally being used when IRQ is being handled, especially in lan8814_gpio_process_cap and since it was not set it will cause a NULL pointer exception and crash the kernel. So, simply always set shared->phydev to avoid the NULL pointer exception.",
    "evidence": "osv:CVE-2025-40239",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.12.56",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.17.6",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2025-40239",
      "aliases": [
        "CVE-2025-40239"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "b3f1a08fcf0dd58d99b14b9f8fbd1929f188b746"
                },
                {
                  "fixed": "da1ef8e9eb5d4a12bec32d11636e521e7d529b9e"
                },
                {
                  "fixed": "b093b06826b836c2824858669db080c190c04715"
                },
                {
                  "fixed": "399d10934740ae8cdaa4e3245f7c5f6c332da844"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-40239.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.10.0"
                },
                {
                  "fixed": "6.12.56"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.17.6"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-40239.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:50.527933732Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/399d10934740ae8cdaa4e3245f7c5f6c332da844",
        "https://git.kernel.org/stable/c/b093b06826b836c2824858669db080c190c04715",
        "https://git.kernel.org/stable/c/da1ef8e9eb5d4a12bec32d11636e521e7d529b9e",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/40xxx/CVE-2025-40239.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-40239",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/40xxx/CVE-2025-40239.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-40239",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 519062,
  "published_at": "2025-12-04T15:31:28.941+00:00"
}