CVE-2025-40239 (GCVE-0-2025-40239)

Vulnerability from cvelistv5 – Published: 2025-12-04 15:31 – Updated: 2025-12-04 15:31
VLAI?
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: b3f1a08fcf0dd58d99b14b9f8fbd1929f188b746 , < da1ef8e9eb5d4a12bec32d11636e521e7d529b9e (git)
Affected: b3f1a08fcf0dd58d99b14b9f8fbd1929f188b746 , < b093b06826b836c2824858669db080c190c04715 (git)
Affected: b3f1a08fcf0dd58d99b14b9f8fbd1929f188b746 , < 399d10934740ae8cdaa4e3245f7c5f6c332da844 (git)
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    Linux Linux Affected: 6.10
Unaffected: 0 , < 6.10 (semver)
Unaffected: 6.12.56 , ≤ 6.12.* (semver)
Unaffected: 6.17.6 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
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{
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/phy/micrel.c"
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              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: phy: micrel: always set shared-\u003ephydev for LAN8814\n\nCurrently, during the LAN8814 PTP probe shared-\u003ephydev is only set if PTP\nclock gets actually set, otherwise the function will return before setting\nit.\n\nThis is an issue as shared-\u003ephydev is unconditionally being used when IRQ\nis being handled, especially in lan8814_gpio_process_cap and since it was\nnot set it will cause a NULL pointer exception and crash the kernel.\n\nSo, simply always set shared-\u003ephydev to avoid the NULL pointer exception."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-04T15:31:28.941Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/399d10934740ae8cdaa4e3245f7c5f6c332da844"
        }
      ],
      "title": "net: phy: micrel: always set shared-\u003ephydev for LAN8814",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-40239",
    "datePublished": "2025-12-04T15:31:28.941Z",
    "dateReserved": "2025-04-16T07:20:57.181Z",
    "dateUpdated": "2025-12-04T15:31:28.941Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
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  }
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.